FN Thomson Reuters Web of Science™ VR 1.0 PT J AU VERBRUGGE, MW DEES, DW AF VERBRUGGE, MW DEES, DW TI THEORETICAL-ANALYSIS OF A BLOCKING-ELECTRODE OXYGEN SENSOR FOR COMBUSTION-GAS STREAMS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ZIRCONIA AB The currently employed oxygen sensor for internal combustion engines, which is used to control the intake air-to-fuel ratio (A/F), performs well near the stoichiometric A/F, but cannot provide precise control during fuel-lean or fuel-rich operation. We propose an alternate oxygen-sensor design, which is based on an established concept of a blocking electrode, and mathematically simulate the sensor response to a typical engine exhaust regime. Mathematical modeling of this device is particularly helpful since (i) the experiments required for the device characterization are difficult and (ii) the differential equations governing the device operation apply to electron, hole, and gas transport, all of which are well understood. C1 ARGONNE NATL LAB, DIV CHEM TECHNOL, ARGONNE, IL 60439 USA. RP VERBRUGGE, MW (reprint author), GM CORP, RES & DEV, DEPT PHYS CHEM, WARREN, MI 48090 USA. NR 38 TC 4 Z9 4 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 EI 1945-7111 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JUL PY 1993 VL 140 IS 7 BP 2001 EP 2010 DI 10.1149/1.2220752 PG 10 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LL842 UT WOS:A1993LL84200037 ER PT J AU BLACKWELL, BF HOGAN, RE AF BLACKWELL, BF HOGAN, RE TI NUMERICAL-SOLUTION OF AXISYMMETRICAL HEAT-CONDUCTION PROBLEMS USING FINITE CONTROL-VOLUME TECHNIQUE SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Article ID ELEMENT METHOD; COLOCATED VARIABLES AB A finite control volume technique is developed to solve two-dimensional heat conduction problems using an arbitrary quadrilateral mesh. In this technique, the integral form of the conservation of energy equation is applied to control volumes of finite size. The boundary conditions considered include specified flux, aerodynamic heating, convection, and radiation. Two example problems involving a specified heat flux boundary condition and a specified temperature in conjunction with a temperature-dependent source are presented to demonstrate quadratic convergence as the mesh is spatially refined. The temperature-dependent source problem is solved using both a rectangular and a skewed mesh; the method is capable of producing accurate results on both rectangular and skewed meshes. Numerical comparisons with a Galerkin finite element code are also presented. C1 SANDIA NATL LABS,DEPT THERMAL & FLUID ENGN 1513,SMTS,ALBUQUERQUE,NM 87185. RP BLACKWELL, BF (reprint author), SANDIA NATL LABS,DEPT THERMOPHYS 1553,DMTS,ALBUQUERQUE,NM 87185, USA. NR 18 TC 6 Z9 10 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD JUL-SEP PY 1993 VL 7 IS 3 BP 462 EP 471 DI 10.2514/3.441 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA LN868 UT WOS:A1993LN86800011 ER PT J AU LO, CW SHUH, DK YARMOFF, JA AF LO, CW SHUH, DK YARMOFF, JA TI INFLUENCE OF ELECTRONIC-STRUCTURE ON XEF2 ETCHING OF SILICON SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID FLUORINE-ATOMS; SURFACE; SI(111); SI(100); ADSORPTION; MECHANISM; PRODUCTS; DYNAMICS; LEVEL AB The work function and Fermi level pinning position of Si(111) exposed to XeF2 are measured with soft x-ray photoemission spectroscopy. The exposures range from the chemisorption of F on Si(111)-7 x 7 to steady-state etching. The work function increases monotonically with XeF2 exposure. The Fermi level is pinned near midgap after each exposure, but moves upwards towards the conduction band as the exposure is increased. The results are discussed in terms of the electronic structure of the surface reaction layer, and a chemical etching mechanism is proposed. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP LO, CW (reprint author), UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA. NR 30 TC 14 Z9 14 U1 0 U2 1 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD JUL-AUG PY 1993 VL 11 IS 4 BP 2054 EP 2058 DI 10.1116/1.578409 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800076 ER PT J AU ALLISON, DP THUNDAT, T JACOBSON, KB BOTTOMLEY, LA WARMACK, RJ AF ALLISON, DP THUNDAT, T JACOBSON, KB BOTTOMLEY, LA WARMACK, RJ TI IMAGING ENTIRE GENETICALLY FUNCTIONAL DNA-MOLECULES WITH THE SCANNING TUNNELING MICROSCOPE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID TUNNELLING MICROSCOPY; RADIOLABELED DNA; PROBE MICROSCOPY; NUCLEIC-ACIDS; GOLD; IMMOBILIZATION; SPECTROSCOPY; SURFACES; IMAGES; WATER AB Deoxyribonucleic acid (DNA) can be immobilized on epitaxial gold surfaces treated with 2-dimethylaminoethanethiol preventing removal of the molecules due to forces exerted by the scanning tunneling microscope probe tip. We present reproducible images of entire plasmid molecules on these surfaces and discuss differences in image contrast that we have observed. C1 GEORGIA INST TECHNOL,SCH CHEM & BIOCHEM,ATLANTA,GA 30332. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP ALLISON, DP (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 25 TC 27 Z9 27 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 816 EP 819 DI 10.1116/1.578310 PN 1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700017 ER PT J AU THUNDAT, T ALLISON, DP WARMACK, RJ DOKTYCZ, MJ JACOBSON, KB BROWN, GM AF THUNDAT, T ALLISON, DP WARMACK, RJ DOKTYCZ, MJ JACOBSON, KB BROWN, GM TI ATOMIC-FORCE MICROSCOPY OF SINGLE-STRANDED AND DOUBLE-STRANDED DEOXYRIBONUCLEIC-ACID SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID DNA-MOLECULES; WATER AB The atomic force microscope (AFM) was used to image double-stranded DNA and single-stranded DNA adsorbed onto mica modified by Ba (II). Images of double-stranded DNA show an open circular shape without drastic contortions, and contour lengths that measure within 7% of the calculated length. Images of single-stranded DNA show two distinct forms; compact open circles with ''nodes'' or lumps almost uniformly distributed are the most frequently observed while less abundant are highly elongated circles with a few nodes. Heating the single-stranded DNA sample and altering the solvent conditions prior to adsorption was found to increase the number of elongated circular molecules observed in the AFM images. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. RI Doktycz, Mitchel/A-7499-2011 OI Doktycz, Mitchel/0000-0003-4856-8343 NR 29 TC 47 Z9 48 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 824 EP 828 DI 10.1116/1.578312 PN 1 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700019 ER PT J AU CHAMBERS, SA AF CHAMBERS, SA TI SCHOTTKY-BARRIER HEIGHT CONTROL AT EPITAXIAL NIAL/GAAS(001) INTERFACES BY MEANS OF VARIABLE BAND-GAP INTERLAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID RAY PHOTOELECTRON DIFFRACTION; FERMI-LEVEL MOVEMENT; UNIFIED DEFECT MODEL; SURFACE TERMINATION; GAAS(001) SURFACES; OHMIC CONTACTS; N-TYPE; GAAS; CHEMISTRY; GROWTH AB This article discusses recent developments in the use of semiconducting interlayers to tailor the Schottky barrier height (SBH) at a metal/GaAs interface. We have used AlAs, GaSeAs1-x, n++-Ge, and n++-Si interlayers between n- and p-GaAs (001) substrates and epitaxial NiAl metallic overlayers to see if a variable SBH is achievable. The interlayers were grown by molecular beam epitaxy and metal organic chemical vapor deposition, while the NiAl overlayers were grown by molecular beam epitaxy. X-ray photoelectron spectroscopy was used to follow the chemistry of interface formation, as well as band offsets and SBH values. Low-energy electron diffraction and x-ray photoelectron diffraction were used to determine structural properties of both the interlayer and overlayer. It was found that thermally stable SBH values ranging from approximately 0.5 eV for n++-Si interlayers to approximately 1.2 eV for AlAs interlayers are readily achievable on n-GaAs. Different mechanisms were found to be responsible for these two extrema in the SBH. For instance, charge transfer from the n++-Si interlayer to the depletion region of the substrate was found to compensate the space-charge region, thereby lowering the band bending and the resulting SBH. In contrast, Fermi-level pinning rather deep in the gap, combined with a substantial conduction band offset at the heterojunction, created a high SBH when AlAs interlayers were used. n++-Ge interlayers, while causing a similar SBH reduction as n++-Si were not found to be thermally stable. Disruption of the anion sublattice and Fermi-level pinning deep in the gap nullified the band flattening effect of the GaSexAs1-x interlayer. Using these fundamental interface science results, we propose an application to complementary digital GaAs circuit design that may significantly reduce gate leakage relative to what can be achieved with conventional metallization schemes. RP CHAMBERS, SA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 44 TC 13 Z9 13 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 860 EP 868 DI 10.1116/1.578318 PN 1 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700025 ER PT J AU CREIGHTON, JR BANSENAUER, BA HUETT, T WHITE, JM AF CREIGHTON, JR BANSENAUER, BA HUETT, T WHITE, JM TI MECHANISM OF CARBON INCORPORATION DURING GAAS EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ENERGY-LOSS SPECTROSCOPY; ATOMIC LAYER EPITAXY; CHEMICAL VAPOR-DEPOSITION; RICH GAAS(100) SURFACES; HYDROGEN CHEMISORPTION; TRIMETHYLGALLIUM; DECOMPOSITION; ARSINE; ADSORPTION; DEPENDENCE AB The use of trimethylgallium (TMGa) as the gallium source during epitaxial growth of GaAs often leads to high levels of carbon incorporation. Using temperature programmed desorption, high-resolution electron energy loss spectroscopy (HREELS), and static secondary ion mass spectroscopy (SSIMS), we have identified a likely carbon incorporation pathway initiated by methyl group dehydrogenation. Methyl group dehydrogenation is evidenced by a small amount of hydrogen evolution around 430-degrees-C. Extended TMGa exposures in this temperature regime yield substantial coverages of methylene (CH2) adsorbate that is detected by HREELS and SSIMS. The CH2 adsorbate undergoes further reaction at higher temperature, yielding acetylene (C2H2), H-2, and CH3 radicals as desorption products at approximately 550-degrees-C. All of these products can be attributed to a mechanism involving CH2 dehydrogenation, hydrogenation, and recombination reactions. The rate of CH3 dehydrogenation is consistent with carbon doping levels typically obtained by metalorganic molecular beam epitaxy (MOMBE) and related techniques. High temperature exposure to arsine (AsH3) consumes the CH2 adsorbate, apparently by hydrogenating them back to CH3 groups that then desorb. This observation explains why carbon doping is lower during atomic layer epitaxy as compared to MOMBE. C1 UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. RP CREIGHTON, JR (reprint author), SANDIA NATL LABS,DEPT 1126,ALBUQUERQUE,NM 87185, USA. RI Schaff, William/B-5839-2009 NR 47 TC 27 Z9 27 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 876 EP 883 DI 10.1116/1.578320 PN 1 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700027 ER PT J AU QU, Y GESSERT, TA RAMANATHAN, K DHERE, RG NOUFI, R COUTTS, TJ AF QU, Y GESSERT, TA RAMANATHAN, K DHERE, RG NOUFI, R COUTTS, TJ TI ELECTRICAL AND OPTICAL-PROPERTIES OF ION-BEAM SPUTTERED ZONAL FILMS AS A FUNCTION OF FILM THICKNESS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID OXIDE-FILMS; THIN-FILMS; TIN OXIDE; DEPENDENCE; TRANSPORT AB Electrical and optical properties of as-deposited, ion beam sputtered, Al-doped ZnO films have been studied as a function of film thickness and carrier concentration. Hall effect measurements reveal that the bulk electrical resistivity of the film generally decreases with increasing film thickness. Additionally, it is observed that the rate of decreasing resistivity depends on the particular film thickness regime. For thinner films (100-200 nm), the resistivity decreases rapidly with increasing film thickness and is due to increases in both carrier concentration and Hall mobility. However, for thicker films, the resistivity decreases more slowly with increasing film thickness and approaches a nearly constant value at a thickness of 1100 nm. In this thickness regime, the slight decrease in resistivity with increasing film thickness is found to be due to an increase in carrier concentration alone. The above observations suggest the presence of at least two scattering mechanisms. It is speculated that grain boundary and ionized impurity are the most likely mechanisms. These issues, together with observed optical properties of the films, are discussed. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP QU, Y (reprint author), COLORADO SCH MINES,GOLDEN,CO 80401, USA. NR 22 TC 44 Z9 45 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 996 EP 1000 DI 10.1116/1.578582 PN 1 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700048 ER PT J AU SHELDON, P KEYES, BM AHRENKIEL, RK ASHER, SE AF SHELDON, P KEYES, BM AHRENKIEL, RK ASHER, SE TI MINORITY-CARRIER LIFETIMES IN MOLECULAR-BEAM EPITAXY-GROWN ALXGA1-XAS/GAAS DOUBLE HETEROSTRUCTURES DOPED WITH ALUMINUM SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID OVAL DEFECTS; GAAS; LAYERS AB Both Al-treated pBN crucibles and Al-doped Ga melts have been used to reduce Ga-cell related oval defect densities in molecular beam epitaxy (MBE) grown epilayers. This practice, although effective in reducing the oval defect density, results in small amounts of Al contamination in the grown films. In this work, we have grown diagnostic Al0.3Ga0.7As/GaAs double heterostructure (DH) devices doped with Al in order to determine the effect of Al contamination on the minority-carrier lifetime. The active region of the DH structures was doped with Al at 5 X 10(18) atoms/cm3 to emulate the levels observed when Al-treated pBN crucibles are used. Al impurity levels and distribution profiles were characterized by secondary ion mass spectrometry, and minority-carrier lifetimes of DH devices were characterized using time-resolved photoluminescence (PL) measurements. Device structures grown with various GaAs active layer thicknesses were used to calculate the interface recombination velocity (S) and the bulk lifetime (tau(B)). We found that Al doping of the GaAs active layer adversely affects the measured PL decay time. GaAs active layers of DH devices doped with Al exhibited poor bulk lifetimes (tau(B) less-than-or-equal-to 120 ns) limited by Shockley-Read-Hall recombination. In contrast, DH devices grown with Al-free active layers resulted in significantly improved PL decay times with bulk lifetimes as high as tau(B) = 700 ns. RP SHELDON, P (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 14 TC 1 Z9 1 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1011 EP 1015 DI 10.1116/1.578805 PN 1 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700051 ER PT J AU NELSON, AJ FRIGO, SP ROSENBERG, R AF NELSON, AJ FRIGO, SP ROSENBERG, R TI SURFACE TYPE CONVERSION OF INP BY H2S PLASMA EXPOSURE - A PHOTOEMISSION INVESTIGATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID CYCLOTRON RESONANCE DISCHARGES; III-V-SEMICONDUCTORS; INDIUM-PHOSPHIDE; GAAS-SURFACES; SPECTROSCOPY; PASSIVATION; CH4/H2/AR; SULFUR; INGAAS AB The surface chemistry and the electronic structure of InP(100) before and after exposure to a H2S plasma was investigated by synchrotron radiation soft x-ray photoemission spectroscopy. The low power H2S plasma was generated with a commercial electron cyclotron resonance plasma source using H2S with the plasma exposure being performed as a function of incident angle and temperature. Plasma species were identified with optical emission spectroscopy. In situ photoemission measurements were acquired after each plasma exposure in order to observe changes in the valence band electronic structure as well as changes in the In 4d, P 2p, and S 2p core lines. The results were correlated in order to relate the plasma species and characteristics to changes in surface chemistry and electronic properties. These measurements indicate that the H2S plasma exposure type converts the p-type InP(100) surface to an n-type surface resulting in a shallow homojunction interface. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Rosenberg, Richard/K-3442-2012 NR 25 TC 15 Z9 15 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1022 EP 1027 DI 10.1116/1.578807 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700053 ER PT J AU WU, J CAO, R YANG, X PIANETTA, P LINDAU, I AF WU, J CAO, R YANG, X PIANETTA, P LINDAU, I TI PHOTOEMISSION-STUDY OF DIAMOND (100) SURFACE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID 111 SURFACE; HYDROGEN; STATES AB The electronic structure of the diamond C (100)-(2 X 1)/(2 X 2) has been investigated by means of angle-resolved photoelectron spectroscopy for the first time. A surface-related shift has been observed in the C Is core-level spectrum. The surface-state band dispersion was measured along the symmetry axis GAMMA-J' in the surface Brillouin zone. For k(parallel-to) = 0, there is a very pronounced surface state 1.5 eV below Fermi level E(F), and it disperses downwards with increasing k(parallel-to). Near the boundary of the surface Brillouin zone J, we find two states with binding energies of 1.9 and 2.4 eV with respect to E(F). RP WU, J (reprint author), STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 12 TC 25 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1048 EP 1051 DI 10.1116/1.578439 PN 1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700058 ER PT J AU APEN, PG ARMSTRONG, SV MOORE, JE ESPINOZA, BF GURULE, V GOBBY, PL WILLIAMS, JM AF APEN, PG ARMSTRONG, SV MOORE, JE ESPINOZA, BF GURULE, V GOBBY, PL WILLIAMS, JM TI PREPARATION OF MICROCELLULAR FOAM IN CYLINDRICAL GOLD TARGETS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC AB The preparation of microcellular foam in submillimeter cylindrical gold targets is described. The gold cylinders were fabricated by electroplating gold onto a silicon bronze mandrel and leaching the mandrel with concentrated nitric acid. After several rinsing and cleaning steps, the cylinders were filled with a solution containing trimethylolpropanetriacrylate (TMPTA). Low density, microcellular polymeric foam was prepared by in situ photopolymerization of the TMPTA solution. Foam preparation was extremely sensitive to metal ion contaminants. In particular, copper ions left behind from ineffective leaching of the silicon bronze mandrels inhibit polymerization and must be removed in order to obtain uniform, nonshrinking foams. A procedure for the effective leaching of the mandrels is described. In addition, a study on the effects of potential contaminants and polymerization inhibitors on TMPTA photopolymerization is presented. RP APEN, PG (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,POLYMERS & COATINGS GRP,MST-7,LOS ALAMOS,NM 87545, USA. NR 11 TC 3 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1248 EP 1251 DI 10.1116/1.578500 PN 1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700091 ER PT J AU TSAI, CC FOSTER, CA MILORA, SL SCHECHTER, DE WHEALTON, JH AF TSAI, CC FOSTER, CA MILORA, SL SCHECHTER, DE WHEALTON, JH TI ELECTRON-BEAM ROCKET ACCELERATION OF HYDROGEN PELLETS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID PLASMA; INJECTION AB A proof-of-principle device for characterizing electron-beam rocket pellet acceleration has been developed and operated during the last few years. Experimental data have been collected for thousands of accelerated hydrogen pellets under a variety of beam conditions. One intact hydrogen pellet was accelerated to a speed of 578 m/s by an electron beam of 10 kV, 0.8 A, and 1 ms. The collected data reveal the significant finding that the measured burn velocity of bare hydrogen pellets increases with the square of the beam voltage in a way that is qualitatively consistent with the theoretical prediction based on the neutral gas shielding (NGS) model. The measured burn velocity increases with the beam current or power and then saturates at values two to three times greater than that predicted by the NGS model. The discrepancy may result from low pellet strength and large beam-pellet interaction areas. Moreover, this feature may be the cause of the low measured exhaust velocity, which often exceeds the sonic velocity of the ablated gas. Consistent with the NGS model, the measured exhaust velocity increases in direct proportion to the beam current and in inverse proportion to the beam voltage. To alleviate the pellet strength problem, experiments have been performed with the hydrogen ice contained in a lightweight rocket casing or shell. Pellets in such sabots have the potential to withstand higher beam powers and achieve higher thrust-coupling efficiency. Some experimental results are reported and ways of accelerating pellets to higher velocity are discussed. RP TSAI, CC (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1252 EP 1257 DI 10.1116/1.578535 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700092 ER PT J AU KUNG, PJ MUENCHAUSEN, RE AF KUNG, PJ MUENCHAUSEN, RE TI GROWTH AND CHARACTERIZATION OF LASER-DEPOSITED SUPERCONDUCTING BI-SR-CA-CU-O THIN-FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID HIGH-TC; INSITU; TEMPERATURE; OXYGEN; PRESSURE AB Superconducting Bi-Sr-Ca-Cu-0 thin films with thickness 400-3500 angstrom have been deposited on (100) MgO and (100) LaAlO3 by a pulsed excimer XeCl laser (lambda = 308 nm, tau = 20 ns, and energy density = 4-5 J/cM2). The oxygen pressure during deposition and the substrate temperature are in the range of 0.1-100 mTorr and 350-750-degrees-C, respectively. The as-deposited films were annealed either inside (in situ) or outside (ex situ) the deposition chamber to improve the crystallinity and the superconducting transition of the films. The formation of 2212 and 2223 phases was controlled by tailoring the deposition and annealing parameters. The corresponding transition temperatures (T(c)'s) of these phases in the ex situ films measured by zero-field cooled diamagnetic transition at 10 Oe are 80 and 110 K; however, the in situ mirrorlike shiny films with 2223 phase only exhibit T(c) = 81 K (or 98 K in an ac field of 0.1 Oe at 125 Hz). These films were also characterized by scanning electron microscopy, transmission electron microscopy, superconducting quantum interference device magnetometer, and ac susceptometer to study their morphology, microstructure, and magnetic properties. The critical magnetization current density (J(c)) of the ex situ films is of the order of 10(7)-10(8) and 10(5)-10(6) A/cm2 for H perpendicular-to c axis and H parallel-to c axis, respectively, at 7 K up to 5 T. J(c) of the in situ films is two orders of magnitude lower than that of the ex situ films, and further enhancement of J(c) appears promising if better crystallinity of the in situ films can be achieved. A qualitative phase diagram with respect to the development of 2212 and 2223 phases is given and discussed. RP KUNG, PJ (reprint author), LOS ALAMOS NATL LAB,SUPERCONDUCT TECHNOL CTR,LOS ALAMOS,NM 87545, USA. NR 26 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1354 EP 1360 DI 10.1116/1.578553 PN 1 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700110 ER PT J AU PANITZ, JKG DUGGER, MT PEEBLES, DE TALLANT, DR HILLS, CR AF PANITZ, JKG DUGGER, MT PEEBLES, DE TALLANT, DR HILLS, CR TI ELECTROPHORETIC DEPOSITION OF PURE MOS2 DRY FILM LUBRICANT COATINGS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID TRIBOLOGICAL PROPERTIES; MOLYBDENUM-DISULFIDE; SPUTTER-DEPOSITION; THIN-FILMS; SURFACE; BOMBARDMENT; BEHAVIOR; WEAR AB Electrophoresis can be employed to deposit a wide variety of materials including MoS2 coatings that exhibit properties comparable to the properties of sputtered MoS2 coatings used as lubricants for vacuum applications. Coatings which display coefficients of friction as low as 0.03 can be deposited from an aqueous suspension containing approximately 2.5 wt %, micrometer-sized MoS2 particles stablized with approximately 500 ppm of a nonionic surfactant. Uniform coatings with appropriate thicknesses can be deposited on nonplanar surfaces in minutes with minimal equipment. The morphology of the as-deposited coatings suggest that MoS2 is electrophoretically active as a result of a net positive surface charge along the basal plane. RP PANITZ, JKG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 36 TC 4 Z9 4 U1 1 U2 13 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1441 EP 1446 DI 10.1116/1.578570 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700127 ER PT J AU BROWN, IG AF BROWN, IG TI METAL-ION IMPLANTATION FOR LARGE-SCALE SURFACE MODIFICATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID VAPOR VACUUM-ARC; BROAD-BEAM; FACILITY; PLASMA; EROSION; ALLOY AB Intense energetic beams of metal ions can be produced by using a metal vapor vacuum arc plasma discharge from which the ion beam is formed. We have developed a number of ion sources of this kind and have built a metal ion implantation facility which can produce repetitively pulsed ion beams with mean energy up to several hundred kilo electron volts, pulsed beam current of more than an ampere, and time averaged current of several tens of milliamperes delivered onto a downstream target. We have also done some preliminary work on scaling up this technology to very large size. For example a 50-cm diam (2000 cm2) set of beam formation electrodes was used to produce a pulsed titanium beam with ion current over 7 A at a mean ion energy of 100 keV. Separately, a dc embodiment has been used to produce a dc titanium ion beam with current over 600 mA, power supply limited in this work, and up to 6 A of dc plasma ion current was maintained for over an hour. We present here a review and summary of this metal ion implantation research program and describe some of the surface modification research that we have done with it. RP BROWN, IG (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 43 TC 23 Z9 23 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1480 EP 1485 DI 10.1116/1.578688 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700135 ER PT J AU JANKOWSKI, AF SCHRAWYER, LR HAYES, JP AF JANKOWSKI, AF SCHRAWYER, LR HAYES, JP TI SPUTTER-DEPOSITION OF YTTRIUM-OXIDES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID THIN-FILMS; MOLYBDENUM AB The yttrium-oxide phase diagram contains only one equilibrium compound, a Y2O3 cubic structure. The process of reactive sputter deposition is used to synthesize previously unreported, yttrium-rich oxide compounds. A planar magnetron is operated in the direct-current mode using a working gas mixture of argon-20% oxygen. For low sputter gas pressure and flow conditions, the yttrium content of the coating is directly controlled as a function of the applied target power, i.e., the deposition rate. The composition and structure of the coatings are characterized using Auger depth profiling and x-ray diffraction. A continuous series of compounds are formed with an orthorhombic crystal structure for concentrations ranging from 40 to 75 at. % yttrium. RP JANKOWSKI, AF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 13 TC 39 Z9 39 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1548 EP 1552 DI 10.1116/1.578503 PN 1 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700146 ER PT J AU HOBSON, JP WELCH, KM AF HOBSON, JP WELCH, KM TI TIME-DEPENDENT HELIUM AND HYDROGEN PRESSURE PROFILES IN A LONG, CRYOGENICALLY COOLED TUBE, PUMPED AT PERIODIC INTERVALS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC AB Many particle accelerators and colliders throughout the world make use of superconducting magnets to focus highly relativistic beams. These magnets are cooled to approximately 4.2 K. For practical reasons, the beam pipes, encircled by the magnets, also operate at these cryogenic temperatures. This article presents a theoretical model for determining pressure profiles, in space and time, stemming from either helium or hydrogen gas leaks into the cold-bore tube with appendage pumps located at periodic intervals. It is shown that a wavelike pressure gradient propagates from the leak source at a rate which is dependent on the leak magnitude, gas species, speed and location of the appendage pumps, and the geometry and effective roughness of the cold-bore tube. Steady-state, linear pressure gradients eventually equilibrate between the appendage pumps in a magnitude commensurate with the mass flow in the beam pipe, while the approach to equilibrium is controlled primarily by the adsorption isotherm of the species. Results are given for a variety of conditions relevant to the relativistic heavy ion collider being constructed at Brookhaven, and a general procedure, with expressions, is provided for the making of similar calculations in other installations. C1 ASSOCIATED UNIV INC,BROOKHAVEN NATL LAB,RHIC PROJECT,UPTON,NY 11973. RP HOBSON, JP (reprint author), NATL VACUUM TECHNOL INC,BOX 4160,POSTAL STN E,OTTAWA K1S 5B2,ON,CANADA. NR 10 TC 11 Z9 11 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1566 EP 1574 DI 10.1116/1.578506 PN 1 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700149 ER PT J AU MAPES, M LEONHARDT, WJ AF MAPES, M LEONHARDT, WJ TI DESIGN OF LARGE-APERTURE, LOW-MASS VACUUM WINDOWS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC AB Large aperture, low mass, thin vacuum windows are required to minimize beam loss in the beam lines of particle accelerators as the products of nuclear collisions move from upstream targets to downstream detectors. This article describes the design, fabrication, testing, and operating experience of a large rectangular vacuum window, 122 cm X 61 cm, and two circular windows of 91.4 and 96.5 em diam. These window designs utilize a composite Kevlar 29 fabric and Mylar laminate as a window material with a typical combined thickness of 0.35 mm. Data for several material thicknesses are also presented. The windows are usually designed to withstand a pressure differential of two to three atmospheres to achieve the required factor of safety. These windows are typically used in the medium vacuum range of 10(-4) Torr. The equations used to predict the behavior of the window material will also be discussed. RP MAPES, M (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1587 EP 1592 DI 10.1116/1.578509 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700152 ER PT J AU WELCH, KM PATE, DJ TODD, RJ AF WELCH, KM PATE, DJ TODD, RJ TI PUMPING OF HELIUM AND HYDROGEN BY SPUTTER-ION PUMPS .1. HELIUM PUMPING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC AB This article is divided into two parts. Part I deals with the pumping of helium by sputter-ion pumps, where Part II, to follow in a subsequent publication in this journal, deals exclusively with the pumping of hydrogen. In Part I, quantitative data are given for the He speeds and capacities of both noble and conventional diode and triode pumps. The effectiveness of various pump regeneration procedures, subsequent to the pumping of He, is reported. These included bakeout and N2 glow discharge cleaning. The comparative desorption of He with the subsequent pumping of N2 is reported on. The N2 speeds of these pumps were used as the benchmarks for defining the size of the pumps versus their respective He speeds. RP WELCH, KM (reprint author), BNL,RHIC PROJECT,UPTON,NY 11973, USA. NR 11 TC 4 Z9 4 U1 2 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1607 EP 1613 DI 10.1116/1.578466 PN 1 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700156 ER PT J AU GORBATKIN, SM BURGIE, RF OLIVER, WC BARBOUR, JC MAYER, TM THOMAS, ML AF GORBATKIN, SM BURGIE, RF OLIVER, WC BARBOUR, JC MAYER, TM THOMAS, ML TI BORON-NITRIDE THIN-FILM DEPOSITION USING ELECTRON-CYCLOTRON-RESONANCE MICROWAVE PLASMAS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID CHEMICAL VAPOR-DEPOSITION; DIAMOND; INDENTATION; BEHAVIOR; SILICON; GROWTH AB Electron cyclotron resonance microwave plasma deposition has been used to deposit BxN1-x thin films from borazine (B3N3H6)-based plasmas, including pure borazine and borazine mixed with either Kr or NH3. Deposited films were analyzed using enhanced cross-section backscattering spectrometry, forward elastic recoil detection, x-ray diffraction, and infrared absorption. A wide range of stoichiometries was accessible even with pure borazine plasmas, with the ratio of B/N ranging from 0.54 to 4.4. The hydrogen atomic fraction varied from approximately 1% to 20% and was typically 2%-3% for stoichiometric boron nitride (BN) films. No evidence of c-BN formation was observed, and measurements of the ion energy at which no net deposition occurs indicate that the high momentum transfer rates to the surface used for recent successful experiments on c-BN deposition are much more difficult to access with a borazine-plasma-based process. The mechanical properties of the films were measured using depth sensing ultralow load indentation tests, and the hardness and modulus of the films are reported. Finally, mass spectrometric measurements of the ions incident on the substrate indicate high hydrogen ion (H+,H-2+,H-3+) concentrations and a relatively small fraction of the boron and nitrogen in the deposited film coming from elemental ion precursors. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GORBATKIN, SM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 34 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1863 EP 1869 DI 10.1116/1.578514 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800042 ER PT J AU MCINTYRE, BJ SALMERON, M SOMORJAI, GA AF MCINTYRE, BJ SALMERON, M SOMORJAI, GA TI IN-SITU SCANNING-TUNNELING-MICROSCOPY STUDY OF PLATINUM (110) IN A REACTOR CELL AT HIGH-PRESSURES AND TEMPERATURES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID FRACTAL SURFACES; PT(110) SURFACE; CHEMISORPTION; ADSORPTION; OXYGEN; PHASE; GOLD AB With a specialized version of a scanning tunneling microscope which allows us to study in situ the atomic structure of surfaces under variable pressures (ultrahigh vacuum-atmospheric) and temperatures (300-425 K), we have investigated the structures of the initially clean (110) surface of single crystal platinum while in environments of hydrogen, oxygen, and carbon monoxide. The surface in 1.6 atm of hydrogen appears to be dominated by various sizes of nested missing-row reconstructions. The surface in 1 atm of carbon monoxide, however, does not have the small scale,missing-row reconstructions, but does appear to have flat terraces separated by multiple height steps. The surface in 1 atm of oxygen appears to have enlarged (111) microfacets. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP MCINTYRE, BJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 20 TC 85 Z9 85 U1 0 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1964 EP 1968 DI 10.1116/1.578531 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800059 ER PT J AU DUNPHY, JC SAUTET, P OGLETREE, DF SALMERON, MB AF DUNPHY, JC SAUTET, P OGLETREE, DF SALMERON, MB TI INVESTIGATION OF THE STRUCTURES OF SULFUR ON MO(100) BY SCANNING-TUNNELING-MICROSCOPY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID SINGLE-CRYSTAL SURFACES; LEED; OVERLAYERS; HYDROGEN; SCIENCE; SITES; FACE AB The structures of the four ordered overlayers of sulfur on the Mo(100) surface were investigated by scanning tunneling microscopy (STM). In order of increasing sulfur coverage, the overlayers have c(2 X 2), /2/1 1/1BAR/, c(4 X 2), and p(2 X 1) low energy electron diffraction (LEED) patterns. Only the c(2 x 2) overlayer geometry has been determined from LEED I(V) analysis. An examination of point and line defects and domain boundaries in STM images provides information beyond that known from LEED on the required symmetries of the ordered overlayers. Several proposed structures were shown to be incompatible with these symmetries and therefore discarded. Only one model of the c(4 X 2) structure was found to be consistent with the symmetry of the STM images. This structure contains sulfur atoms occupying exclusively fourfold hollow sites. Unexpectedly, STM images of the surface with the p(2 X 1) LEED pattern did not have p(2 X 1) symmetry, but consisted of small domains of the c(4 X 2) structure. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. ENS LYON,F-69464 LYON 7,FRANCE. INST RECH CATALYSE,F-69626 VILLEURBANNE,FRANCE. RP DUNPHY, JC (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Sautet, Philippe/G-3710-2014; Ogletree, D Frank/D-9833-2016 OI Sautet, Philippe/0000-0002-8444-3348; Ogletree, D Frank/0000-0002-8159-0182 NR 22 TC 13 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1975 EP 1981 DI 10.1116/1.578533 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800061 ER PT J AU RODRIGUEZ, JA HRBEK, J AF RODRIGUEZ, JA HRBEK, J TI PHOTOEMISSION-STUDIES OF ZINC-NOBLE METAL-ALLOYS - ZN-CU, ZN-AG, AND ZN-AU FILMS ON RU(001) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ELECTRONIC-STRUCTURE; INTERMETALLIC COMPOUNDS; CHEMISORPTION; SURFACE; CU(100); STATES; BANDS AB Zn and the noble metals alloy when coadsorbed on Ru(001). The properties of Zn-Cu, Zn-Ag, and Zn-Au alloys have been studied using core- and valence-level photoemission and temperature programmed desorption. Alloy formation induces only small shifts (- 0.2 to - 0.3 eV) in the position of the Zn 2p, 3s, and 3d levels. In contrast, the core and valence levels of the noble metals show large shifts toward higher binding energy. For small amounts of Cu, Ag, and Au dissolved in Zn multilayers, the shifts in the core levels of the nobel metals follow the sequence: Cu (2P3/2), 0.8 eV almost-equal-to Ag (3d5/2), 0.8 eV < Au (4f7/2), 1.4 eV. The magnitude of the shift increases as the Pauling electronegativity of the noble metal increases. However, the sign of the shifts for the Cu(2P3/2), Ag(3d5/2), or Au(4f7/2) levels is not directly determined by the direction of charge transfer within the corresponding Zn-noble metal bond. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DIV CHEM,UPTON,NY 11973, USA. RI Hrbek, Jan/I-1020-2013 NR 30 TC 10 Z9 10 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1998 EP 2002 DI 10.1116/1.578398 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800065 ER PT J AU RODRIGUEZ, JA HRBEK, J KUHN, M SHAM, TK AF RODRIGUEZ, JA HRBEK, J KUHN, M SHAM, TK TI ELECTRONIC AND CHEMICAL-PROPERTIES OF LI-AU AND CS-AU FILMS ON RU(001) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ALKALI-METAL OXIDES; OXYGEN; PHOTOEMISSION; POTASSIUM; OXIDATION; SURFACE; CESIUM AB The core and valence levels of Li-Au and Cs-Au films have been studied using synchrotron radiation. For Li-Au, the results of valence-band photoemission show no band gap in the region close to the Fermi level indicating that this compound has metallic properties. In contrast, the valence spectra of CsAu show the typical band gap expected for a highly ionic compound. The formation of alkali-gold bonds induces shifts in the core levels that are not controlled exclusively by changes in the charge of the metal centers. Alloys saturated with Cs or Li show binding-energy shifts of +1.3 or +0.7 eV, respectively, in the Au(4f) levels. LiAu and CsAu compounds are very reactive toward oxygen. The presence of oxygen shifts the Au(4f) levels of the alkali-gold alloys toward lower binding energy. The interaction of O2 with CsAu at 100 K produces O-2(2-) (the only oxygen species at low O2 exposures) and O2-. Annealing of the O2/CsAu film to 300 K leads to the disappearance of O2- and the appearance of O2-. The adsorption of O2 on Li-Au alloys at 300 K produces the O2- ion together with another oxygen species. C1 UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Hrbek, Jan/I-1020-2013 NR 30 TC 7 Z9 7 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2029 EP 2033 DI 10.1116/1.578404 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800071 ER PT J AU WEISS, W SOMORJAI, GA AF WEISS, W SOMORJAI, GA TI PREPARATION AND STRUCTURE OF 1-8 MONOLAYER THICK EPITAXIAL IRON-OXIDE FILMS GROWN ON PT(111) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID SURFACE; FEO AB Well ordered epitaxial iron oxide layers with FeO stoichiometry were grown onto Pt (111) single crystal substrates and characterized afterwards with low-energy electron diffraction (LEED) and Auger electron spectroscopy. They were prepared by first depositing iron from the vapor onto the substrate and then oxidizing it in 10(-6) Torr of oxygen. At 1 monolayer coverage, a very stable structure with a hexagonal unit cell 15% larger than the platinum (1 X 1) substrate unit cell is formed, exhibiting a threefold symmetric LEED pattern. This pattern is consistent with a (8 X 8) superstructure, as 8 FeO(111)-(1 X 1) lattice spacing fit onto nine lattice spacings on the Pt(111)-(1 X 1) substrate surface due to the lattice mismatch. Above 2 monolayer coverage a hexagonal (2 x 2) structure with respect to the FeO (111)-(1 X 1) unit cell forms, which shows a sixfold symmetric LEED pattern revealing a lattice constant which is in agreement with that of the sodium chloride structure of bulk FeO. LEED beam intensity spectra as a function of the electron energy of these two LEED structures have been measured and are discussed with respect to their symmetry and their changes as a function of the overlayer thickness. The step structure on the surface of an 8 monolayer thick iron oxide film with a FeO(111)-(2 X 2) LEED pattern was studied by analyzing the LEED beam, profiles. We observe steps one iron-oxygen bilayer high as well as one Pt(111) layer distance high. This indicates that only one type of atom termination exists on the FeO (111)-(2 X 2) surface. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP WEISS, W (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 11 TC 55 Z9 55 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2138 EP 2144 DI 10.1116/1.578382 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800091 ER PT J AU DUNPHY, JC SAUTET, P OGLETREE, DF SALMERON, MB AF DUNPHY, JC SAUTET, P OGLETREE, DF SALMERON, MB TI APPLICATION OF SCANNING-TUNNELING-MICROSCOPY TO STUDY ADATOM DIFFUSION AND LATERAL INTERACTIONS - SULFUR ON RE(0001) AT LOW COVERAGES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID SINGLE-CRYSTAL SURFACES; CARBON-MONOXIDE; ADSORPTION; OVERLAYERS; STM; TRANSFORMATION; DYNAMICS AB Scanning tunneling microscopy (STM) imaging was applied to study coverages of less than 0.3 monolayers of sulfur on a rhenium(0001) surface. At coverages near one quarter monolayer sulfur forms a p(2 X 2) ordered overlayer. Below this coverage islands of p(2 X 2) ordered sulfur form, indicating an attractive interaction between sulfur atoms at twice the Re lattice spacing. Between these islands the STM images appear noisy. A correlation technique was applied to these images which showed that this noise was actually due to sulfur atoms diffusing on the same time scale as the STM image was acquired. The pair interaction energy between sulfur atoms at twice the Re lattice distance was determined by fitting the results of this correlation technique to an Ising model. The mobility of sulfur on the surface was further investigated by coadsorbing CO. This was found to compress the dilute sulfur overlayer into an ordered structure usually only seen at higher coverages. The transformation was observed by both low energy electron diffraction and STM. An upper limit for the energy required to compress the overlayer was extracted from the adsorption energy of CO. The energy barrier to diffusion was estimated from the average residence time of the diffusing sulfur atoms. These energies compare well with an extended Huckel calculation. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LENS LYON,CHIM THEOR LAB,F-69464 LYON 7,FRANCE. INST RECH CATALYSE,F-69626 VILLEURBANNE,FRANCE. RP DUNPHY, JC (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Sautet, Philippe/G-3710-2014; Ogletree, D Frank/D-9833-2016 OI Sautet, Philippe/0000-0002-8444-3348; Ogletree, D Frank/0000-0002-8159-0182 NR 24 TC 15 Z9 15 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2145 EP 2152 DI 10.1116/1.578383 PN 2 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800092 ER PT J AU LESSOR, DL DUKE, CB KAHN, A FORD, WK AF LESSOR, DL DUKE, CB KAHN, A FORD, WK TI IONICITY DEPENDENCE OF SURFACE BOND LENGTHS ON THE (110) CLEAVAGE FACES OF ISOELECTRONIC ZINCBLENDE STRUCTURE COMPOUND SEMICONDUCTORS - GAP, ZNS, AND CUCL SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ENERGY-ELECTRON-DIFFRACTION; ATOMIC GEOMETRY; GAAS(110); INTENSITIES; RELAXATION; GAP(110); ANTIMONY; BISMUTH AB Previously measured low-energy electron diffraction (LEED) intensity data for the (110) surfaces of the isoelectronic series GaP, ZnS, and CuCl, are reanalyzed using dynamical LEED calculations, a new selection of independent structural variables, and an automated optimization procedure. The bond lengths of the atoms in the top layer and perpendicular displacements of the cation-anion sublattices in the top two layers are selected as the independent structural variables. All other bond lengths are taken to be equal to their bulk values. An automated gradient method search procedure is utilized to obtain these structural variables by optimizing the fit of the measured intensities by the calculated ones as determined by the x-ray R factor. This procedure permits a precise comparison of the bond lengths of species in the top layer from one material to another. Our major finding is that the bond lengths, d, between the anion and cation in the top layer depend on the spectroscopic ionicity, f, via [(d - d(B))/d(B)] = 0.025 - 0.14f, in which d(B) is the bulk value of the bond length. The bonds between surface and subsurface species do not exhibit a systematic dependence on f. C1 XEROX CORP, WEBSTER RES CTR, WEBSTER, NY 14580 USA. PRINCETON UNIV, DEPT ELECT ENGN, PRINCETON, NJ 08544 USA. MONTANA STATE UNIV, CTR ADV MAT, BOZEMAN, MT 59717 USA. MONTANA STATE UNIV, DEPT PHYS, BOZEMAN, MT 59717 USA. RP LESSOR, DL (reprint author), PACIFIC NW LAB, K7-15 ISB-1, RICHLAND, WA 99352 USA. NR 21 TC 11 Z9 11 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2205 EP 2209 DI 10.1116/1.578393 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800102 ER PT J AU MARKOVIC, NM ROSS, PN AF MARKOVIC, NM ROSS, PN TI ELECTRODEPOSITION OF COPPER ON PT(111) AND PT(100) SINGLE-CRYSTAL SURFACES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ULTRATHIN CU FILMS; UNDERPOTENTIAL DEPOSITION; PLATINUM-ELECTRODES; ADSORPTION; ELECTROSORPTION; ANIONS; ELECTROCHEMISTRY; HYDROGEN; IONS; CHEMISTRY AB The electrodeposition of copper on Pt(100) and Pt(111) in different acid electrolytes was studied by cyclic voltammetry, ex situ Auger electron spectroscopy and low energy electron diffraction (LEED). The specific adsorption of Cl- from HF and HClO4 solutions was found to have a strong effect on the submonolayer deposition process. LEED results from emersed electrodes indicated that for submonolayer deposition from a ''chloride free'' solution the copper was growing in islands (or ''patches'') having the lattice constant of the platinum substrate, i.e., pseudomorphic growth as in vapor deposition of Cu on Pt. In the presence of Cl-submonolayers of Cu were deposited in the form of a Cu-Cl adlattice. After deposition at either the Nernst potential (one monolayer) or at approximately 0.2 V negative of it (four monolayers), Cu formed a uniform epitaxial metallic layer with an ordered Cl adlayer on the top of the Cu layer in a structure esssentially identical to that for Cl adsorbed from the gas phase onto a bulk Cu crystal to saturation. RP MARKOVIC, NM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 29 TC 26 Z9 26 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2225 EP 2231 DI 10.1116/1.578352 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800105 ER PT J AU SIMONS, JK FRIGO, SP TAYLOR, JW ROSENBERG, RA AF SIMONS, JK FRIGO, SP TAYLOR, JW ROSENBERG, RA TI X-RAY-ENERGY DEPENDENT PHOTOCHEMISTRY OF THE ADAMANTANE (C10H16)/SI(111)-7X7 SURFACE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID CHEMICAL-VAPOR-DEPOSITION; DIAMOND FILMS; GROWTH; NUCLEATION; PHASE AB We have studied the synchrotron radiation (SR) induced photochemistry of the adamantane (C10H16) dosed Si(111)-7 X 7 surface using photoelectron spectroscopy. The adamantane/Si surfaces were characterized before and after they were exposed to broadband SR of varying energies and then annealed. When annealed to 525 K, the unexposed adamantane layers desorbed leaving only a layer of Si-H and hydrated Si-C species on the surface. When the adamantane adlayer was irradiated with broadband SR that contained energies greater than the C(1s) binding energy (284 eV), the surface reacted to form a layer similar to SiC. In contrast, when the surface was irradiated with broadband SR with energies below 284 eV, only the adamantane in direct contact with the Si surface dissociated. The remaining adamantane adlayer reacted with the surface in a manner which left the molecular structure of the reacted adamantane intact. The reacted adamantane layer was stable up to temperatures of at least 675 K. C1 UNIV WISCONSIN MADISON,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. UNIV WISCONSIN,DEPT CHEM,MADISON,WI 53706. ARGONNE NATL LAB,ARGONNE,IL 60439. RP SIMONS, JK (reprint author), UNIV WISCONSIN MADISON,DEPT CHEM,STOUGHTON,WI 53589, USA. RI Rosenberg, Richard/K-3442-2012 NR 19 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2244 EP 2249 DI 10.1116/1.578355 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800108 ER PT J AU GERMAN, KAH WEARE, CB VAREKAMP, PR YARMOFF, JA ANDERSEN, JN AF GERMAN, KAH WEARE, CB VAREKAMP, PR YARMOFF, JA ANDERSEN, JN TI TRAJECTORY-DEPENDENT RESONANT NEUTRALIZATION OF LOW-ENERGY LI-7+ SCATTERED FROM CLEAN AND NA-COVERED AL(100) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ION-SCATTERING; SURFACE GEOMETRY; CHARGE-EXCHANGE; WORK FUNCTION; ALKALI IONS; ADSORBATES; POTASSIUM; COVALENT; ALUMINUM; CU(110) AB Trajectory-dependent neutralization is observed for low energy (1-5 keV) Li-7+ ions scattered at large angles from Na-covered Al(100). Energy spectra and angular scans of the scattered Li+ ion yield are collected as a function of Na coverage. Li+ ions are partially neutralized upon single scattering from Al sites and completely neutralized when scattered from Na. This site-specific neutralization indicates that the surface electrostatic potential is nonuniform. The neutralization probability is also shown to be a function of the exit angle from the surface. The results are analyzed using theoretical ion fractions based on a semiclassical resonant charge exchange model. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LUND UNIV,INST PHYS,DEPT SYNCHOTRON RADIAT RES,S-22362 LUND,SWEDEN. RP GERMAN, KAH (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 24 TC 3 Z9 3 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2260 EP 2263 DI 10.1116/1.578358 PN 2 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800111 ER PT J AU RIEKE, PC BAER, DR FRYXELL, GE ENGELHARD, MH PORTER, MS AF RIEKE, PC BAER, DR FRYXELL, GE ENGELHARD, MH PORTER, MS TI BEAM DAMAGE OF SELF-ASSEMBLED MONOLAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC AB X-ray and electron beam damage studies were performed on Br-terminated and methyl-terminated alkylsilane self-assembled monolayers. X-ray beam initiated damage was primarily limited to removal of the labile Br group and did not significantly damage the hydrocarbon chain. Some of the x-ray beam damage could be attributed to low-energy electrons emitted by the non-monochromatic source, but further damage was attributed to secondary electrons produced in the sample by x-ray exposure. Electron beams caused significant damage to the hydrocarbon chains. Maximum damage occurred with a beam energy of 600 eV and a dosage of 6 X 10(-3) C/cm2. RP RIEKE, PC (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Engelhard, Mark/F-1317-2010; Baer, Donald/J-6191-2013 OI Baer, Donald/0000-0003-0875-5961 NR 13 TC 54 Z9 54 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2292 EP 2297 DI 10.1116/1.578364 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800117 ER PT J AU RAYCHAUDHURI, AK NG, W LIANG, S SINGH, S WELNAK, JT WALLACE, JP CAPASSO, C CERRINA, F MARGARITONDO, G UNDERWOOD, JH KORTRIGHT, JB PERERA, RCC AF RAYCHAUDHURI, AK NG, W LIANG, S SINGH, S WELNAK, JT WALLACE, JP CAPASSO, C CERRINA, F MARGARITONDO, G UNDERWOOD, JH KORTRIGHT, JB PERERA, RCC TI 1ST RESULTS OF MICROSPECTROSCOPY FROM A SCANNING PHOTOEMISSION MICROSCOPE WITH A SUBMICRON PROBE SIZE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID PHOTOELECTRON MICROSCOPE; SYNCHROTRON RADIATION; MAXIMUM AB Utilizing a Mo-Si multilayer coated Schwarzschild objective to focus 95 eV photons, we have recently demonstrated better than 0.1 mum resolution as a scanning x-ray transmission microscope. Operating as a scanning photoemission microscope with submicron resolution, we have demonstrated its chemical mapping capabilities by studying a patterned Al/AlO(x) test structure. In addition, we have also studied the cleaved GaAs (110) surface and have identified lateral variations in the surface band bending on the scale of 100 meV. In both experiments, core level microspectroscopy was performed at selected points on the sample to elucidate the image contrast mechanisms. C1 ECOLE POLYTECH FED LAUSANNE,INST PHYS APPL,CH-1015 LAUSANNE,SWITZERLAND. LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. RP RAYCHAUDHURI, AK (reprint author), UNIV WISCONSIN MADISON,CTR XRAY LITHOG,STOUGHTON,WI 53589, USA. RI Margaritondo, Giorgio/B-1367-2008 NR 14 TC 24 Z9 24 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2324 EP 2329 DI 10.1116/1.578370 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800123 ER PT J AU KENDELEWICZ, T WOICIK, JC HERRERAGOMEZ, A MIYANO, KE COWAN, PL KARLIN, BA PIANETTA, P SPICER, WE AF KENDELEWICZ, T WOICIK, JC HERRERAGOMEZ, A MIYANO, KE COWAN, PL KARLIN, BA PIANETTA, P SPICER, WE TI X-RAY STANDING-WAVE STUDY OF THE SB/GAAS(110) INTERFACE STRUCTURE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID SURFACE ELECTRONIC-STRUCTURE; COLUMN-V ELEMENTS; SB OVERLAYERS; GAAS(110) SURFACE; 110 SURFACES; ANTIMONY; SEMICONDUCTORS; STATES AB The x-ray standing wave technique has been used to determine the geometric structure of the monolayer Sb/GaAs (110) interface. Using the backreflection diffraction geometry, we find the average perpendicular distance of Sb atoms from the (220), (400), and (111) diffracting planes to be 2.27+/-0.05, 1.60+/-0.05, and 3.00+/-0.1 angstrom, respectively. On the basis of these data, the atomic coordinates of the overlayer have been quantitatively established. The results are in agreement with theoretical calculations for the epitaxial continued layer structure and inconsistent with other models of zigzag chains. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. ARGONNE NATL LAB,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KENDELEWICZ, T (reprint author), STANFORD UNIV,ELECTR LAB,STANFORD,CA 94305, USA. NR 23 TC 11 Z9 11 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2351 EP 2353 DI 10.1116/1.578331 PN 2 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800128 ER PT J AU HERRERAGOMEZ, A KENDELEWICZ, T WOICIK, JC MIYANO, KE PIANETTA, P SOUTHWORTH, S COWAN, PL KARLIN, BA SPICER, WE AF HERRERAGOMEZ, A KENDELEWICZ, T WOICIK, JC MIYANO, KE PIANETTA, P SOUTHWORTH, S COWAN, PL KARLIN, BA SPICER, WE TI DETERMINATION OF THE GEOMETRICAL CONFIGURATION OF BI ON GAAS (110) BY X-RAY STANDING-WAVE TRIANGULATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID GAAS(110); INTERFACE; INP(110); SB AB Triangulation from x-ray standing wave applied to three Bragg planes, together with symmetry considerations, have established the geometrical structure of epitaxial Bi overlayers on GaAs (110). Our results are consistent with the epitaxial continued layer structure model. Our analysis is based on prior experimental results that indicate two equally populated Bi sites. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. ARGONNE NATL LAB,ARGONNE,IL 60439. RP HERRERAGOMEZ, A (reprint author), STANFORD ELECTR LAB,STANFORD,CA 94305, USA. NR 13 TC 11 Z9 11 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2354 EP 2358 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800129 ER PT J AU WOICIK, JC KENDELEWICZ, T HERRERAGOMEZ, A ANDREWS, AB KIM, BS COWAN, PL MIYANO, KE BOULDIN, CE KARLIN, BA HERMAN, GS ERSKINE, JL PIANETTA, P SPICER, WE AF WOICIK, JC KENDELEWICZ, T HERRERAGOMEZ, A ANDREWS, AB KIM, BS COWAN, PL MIYANO, KE BOULDIN, CE KARLIN, BA HERMAN, GS ERSKINE, JL PIANETTA, P SPICER, WE TI ADATOM LOCATION ON THE SI(111) 7X7 AND SI(111) ROOT-3X-ROOT-3-IN SURFACES BY THE X-RAY STANDING-WAVE AND PHOTOEMISSION TECHNIQUES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ABSORPTION FINE-STRUCTURE; SILICON 111 SURFACE; RECONSTRUCTION; GAAS(110); STATES; SB AB The x-ray standing wave technique has been used to determine the adatom positions on the Si(111) 7 X 7 and Si(111) square-root 3 X square-root 3-In surfaces. By monitoring the intensity of the surface sensitive Si Is photopeak as a function of photon energy around the Si(111) Bragg backreflection condition, we determine the Si adatoms of the clean 7 X 7 surface to reside 1.69+/-0.1 angstrom above the extrapolated Si(111) bulk plane. In contrast, the In adatoms on the 1/3 monolayer square-root 3 X square-root 3-In surface are found to remove the Si displacements and lie at a position of 2.11+/-0.05 angstrom. High-resolution Si 2p core-level measurements support the T4 geometry for the In adatom location. C1 STANFORD UNIV,ELECTR LAB,STANFORD,CA 94305. UNIV TEXAS,AUSTIN,TX 78712. ARGONNE NATL LAB,ARGONNE,IL 60439. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. USN,RES LAB,WASHINGTON,DC 20375. RP WOICIK, JC (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 23 TC 9 Z9 9 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2359 EP 2363 DI 10.1116/1.578333 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800130 ER PT J AU JUNG, DR KING, DE CZANDERNA, AW AF JUNG, DR KING, DE CZANDERNA, AW TI METAL OVERLAYERS ON ORGANIC FUNCTIONAL-GROUPS OF SELF-ORGANIZED MOLECULAR ASSEMBLIES .2. X-RAY PHOTOELECTRON-SPECTROSCOPY OF INTERACTIONS OF CU/CN ON 12-MERCAPTODODECANENITRILE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID 11-MERCAPTOUNDECANOIC ACID; MONOLAYERS; COPPER; GOLD; SURFACES; SILVER; ISS AB The interaction of evaporated copper overlayers, from 0.03 to 0.4 nm thick, with specific terminal functional groups of an organized molecular assembly (OMA) of HS(CH2)11CN formed on gold has been studied by x-ray photoelectron spectroscopy. For average copper coverages above 0.1 nm, the peak intensities show fair agreement with a model that assumes an increasing fraction of each increment of the deposited copper penetrates the OMA and resides at the OMA/Au interface. For lower coverages, a weak Cu(CN) interaction is indicated by shifts of the N 1s level and the C 1s high binding energy (HBE) shoulder to lower binding of as well as by the presence of a Cu 2p HBE shoulder. RP JUNG, DR (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 22 TC 28 Z9 28 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 2382 EP 2386 DI 10.1116/1.578338 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800135 ER PT J AU LILIENTALWEBER, Z CHEN, Y WERNER, P ZAKHAROV, N SWIDER, W WASHBURN, J KLEM, JF TSAO, JY AF LILIENTALWEBER, Z CHEN, Y WERNER, P ZAKHAROV, N SWIDER, W WASHBURN, J KLEM, JF TSAO, JY TI INTERFACIAL DEFECTS AND MORPHOLOGY OF INGAAS EPITAXIAL LAYERS GROWN ON TILTED GAAS SUBSTRATES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID DISLOCATIONS; STRAIN AB Systematic transmission electron microscopy studies of In0.2Ga0.8As layers grown by molecular-beam epitaxy on [001] GaAs substrates and on substrates tilted up to 10-degrees toward [110], [120], [100], [110BAR], and [120BAR] are described. Three different layer thicknesses were investigated: 6, 20, and 40 nm. In the 40 nm layers misfit dislocations were formed which partially relaxed the elastic strain. Three-dimensional growth with an indication of microscale In segregation (dendritic growth) occurred for substrates tilted toward [110BAR] and [120BAR] directions. Smooth growth surfaces were observed when the substrates were tilted toward [110] and [120] showing that the chemistry of the predominant surface growth steps can play an important role in the growth mode and quality of the epitaxial layer. Indium segregation to misfit dislocation cores, the presence of In-rich platelets near the interface, and diffuseness of the interface are considered as evidence for short range migration of In during and after growth. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP LILIENTALWEBER, Z (reprint author), LAWRENCE BERKELEY LAB,DEPT MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 10 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1379 EP 1383 DI 10.1116/1.586944 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000025 ER PT J AU ROTENBERG, E DENLINGER, JD HESSINGER, U LESKOVAR, M OLMSTEAD, MA AF ROTENBERG, E DENLINGER, JD HESSINGER, U LESKOVAR, M OLMSTEAD, MA TI SURFACE CORE-LEVEL SHIFTS IN CAF2-ON-SI(111) FILMS - EXPERIMENT AND THEORY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID ELECTRONIC-STRUCTURE; INTERFACE; PHOTOELECTRON; PHOTOEMISSION; SPECTRA AB Using a combination of in situ x-ray photoelectron spectroscopy and x-ray photoelectron diffraction, we have resolved surface core-level shifts for Ca and F atoms in thin (three-eight layers) CaF2-on-Si(111) films. These values are 0.7 +/- 0.1 eV towards higher binding energy for Ca 2p electrons and 0.6 +/- 0.1 eV towards lower kinetic energy for F KVV electrons. These shifts are in good agreement with a simple extra-atomic electrostatic model in which the shifts are due to the change in both the Madelung potential and the polarization response (relaxation) at the surface. We find no evidence for altered ionicity at the CaF2(111) surface. C1 UNIV WASHINGTON FM15, DEPT PHYS, SEATTLE, WA 98195 USA. LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. RP ROTENBERG, E (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Rotenberg, Eli/B-3700-2009 OI Rotenberg, Eli/0000-0002-3979-8844 NR 16 TC 17 Z9 17 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1444 EP 1448 DI 10.1116/1.586957 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000038 ER PT J AU KENDELEWICZ, T WOICIK, JC MIYANO, KE HERRERAGOMEZ, A COWAN, PL PIANETTA, P SPICER, WE AF KENDELEWICZ, T WOICIK, JC MIYANO, KE HERRERAGOMEZ, A COWAN, PL PIANETTA, P SPICER, WE TI STRUCTURE OF SB MONOLAYERS ON GE(111)2X1 - A COMBINED STUDY USING CORE-LEVEL PHOTOEMISSION, X-RAY STANDING WAVES, AND SURFACE EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID SCANNING TUNNELING MICROSCOPY; SI(111); RECONSTRUCTION; DIFFRACTION; TRIMER AB The atomic stucture of an annealed monolayer of Sb on the Ge (111) - (2 X 1) surface has been studied with core-level photoemission, x-ray standing waves (XSW), and surface extended x-ray absorption fine structure (SEXAFS). Phase analysis of the SEXAFS data taken over the Sb L3 edge using bulk Sb and GaSb as standards determines the bond lengths within the first Sb shell to be 2.87 +/- 0.03 angstrom and 2.67 +/- 0.03 angstrom for the Sb-Sb and Sb-Ge bonds, respectively. The XSW data for (111) planes, taken in the backreflection diffraction geometry, place the Sb layer 2.60 +/- 0.05 angstrom above the Ge(111) surface. A relatively high coherent fraction (0.85) indicates small disorder or buckling in the Sb overlayer. The Sb overlayer is found to quench the clean surface shifted components of the Ge 3d core-level spectrum, which indicates an ideal termination of the Ge (111) surface with all dangling bonds saturated by the Sb adatoms. Lack of chemically shifted components in both the Ge 3d and the Sb 4d core level spectra indicates a single bonding site for the Sb atoms. Although it is not possible to differentiate between Sb trimers [as found for the Sb/Si(111) interface] or zigzag chains (common for Sb/III-V interfaces) on the Ge surface, substitutional geometries, in which Sb replaces the topmost layer of the Ge surface bilayer [as found for As/Ge (111)], can be ruled out. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. ARGONNE NATL LAB,ARGONNE,IL 60439. RP KENDELEWICZ, T (reprint author), STANFORD UNIV,STANFORD ELECTR LAB,STANFORD,CA 94305, USA. NR 26 TC 8 Z9 8 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1449 EP 1454 DI 10.1116/1.586958 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000039 ER PT J AU CAO, R YANG, X PIANETTA, P AF CAO, R YANG, X PIANETTA, P TI ATOMIC AND ELECTRONIC-STRUCTURE OF B/SI(100) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID SI(100) SURFACE; RECONSTRUCTION; SI(111); GROWTH; BORON; MONOLAYER; SPECTROSCOPY; GE; SI; 2P AB The atomic and electronic structures of the B/Si(100) surface have been studied using high-resolution core level and valence band photoelectron spectroscopy as well as low energy electron diffraction. The structure models for such a surface have been proposed, which consist of boron atoms residing on the top surface adatom sites. Experimental evidence shows that this surface is not a dangling bond-free surface. Epitaxial growth of Si and Ge on this structure has been achieved at relatively low temperature, and our results indicate that boron atoms underneath the epitaxial layer act as acceptors. As a result, conversion of an n-type to p-type region takes place near the surface. Comparison of this surface with the other group-III metals on Si(100) surface has also been conducted. RP CAO, R (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 20 TC 17 Z9 17 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1455 EP 1458 DI 10.1116/1.586911 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000040 ER PT J AU TRAN, TT CHAMBERS, SA AF TRAN, TT CHAMBERS, SA TI INTERFACE STRUCTURE OF THE 1 MONOLAYER (2X1)-SI/GAAS(001) SYSTEM BY X-RAY PHOTOELECTRON DIFFRACTION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID BAND OFFSETS; HETEROSTRUCTURES; SI AB X-ray photoelectron diffraction was used to investigate the interface structure created by deposition of 1 monolayer-equivalent (ML-eq) of Si onto As-stabilized GaAs(001)-c(2 X 8)/(2 X 4). The system was grown via molecular-beam epitaxy at a substrate temperature of 450-degrees-C. AlKalpha-excited azimuthal angle-resolved Si 2p photoelectron intensities were measured and compared with model angular distributions generated by means of spherical-wave, single-scattering cluster theory. Both the distribution of 1 ML-eq of Si atoms and the coordinates of atoms in the near-surface region were varied to optimize agreement with experiment. Substantial evidence was found for substitutional Si in the first three atomic layers. The extensive amount of diffraction modulation observed at polar angles up to 90-degrees indicates that Si does not form a segregated ML at the surface, but rather, diffuses into the subsurface region. The best agreement between theory and experiment was obtained by modeling the ratio of Si fractional occupancies in the first, second, and third layers as 1.0:0.5:0.25. In addition, the (2 X 1) reconstruction geometry was modeled with a topmost Si atom displacement of 0.5 angstrom from bulk-truncated coordinates along [110] (the dimer bond direction), and a second-layer Si atom displacement of 0.4 angstrom along [110BAR]. Thus, the near-surface region is under considerable strain as Si atoms form surface dimers while being ''anchored'' to a lattice with dimensions that are 4% larger than those of bulk Si. These results provide an explanation for the unusual behavior of the AlAs/Si/GaAs heterojunction band offset. RP TRAN, TT (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999,MS K2-12, RICHLAND, WA 99352 USA. NR 8 TC 8 Z9 8 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1459 EP 1462 DI 10.1116/1.586912 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000041 ER PT J AU KLEPEIS, JE MAILHIOT, C VANSCHILFGAARDE, M METHFESSEL, M AF KLEPEIS, JE MAILHIOT, C VANSCHILFGAARDE, M METHFESSEL, M TI ROLE OF IONICITY IN THE DETERMINATION OF SURFACE ATOMIC GEOMETRIES - GAP, ZNS, AND CUCL (110) SURFACES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID ELECTRONIC-STRUCTURE AB First-principles total energy calculations were carried out in order to determine the local atomic geometry of the (110) surfaces for the isoelectronic series GaP, ZnS, and CuCl. Despite the large change in ionicity across the series (Phillips ionicities: f(GaP) = 0.37, f(ZnS) = 0.62, and f(CuCl) = 0.75), it was found that all three surfaces exhibit an activationless, bond-rotation relaxation with a rotation angle of approximately 25-degrees or greater. While this result is well known in the case of III-V (110) surfaces, it is in contradiction to a previous calculation which predicted that the bond-rotation angle would decrease with increasing ionicity, going to zero for CuCl. However, our results are in qualitative agreement with a recent dynamical low-energy electron diffraction analysis of the CuCl (110) surface. Despite the presence of a large-angle bond rotation for all three surfaces, the local atomic geometries depend on ionicity as follows: both the total energy gain for a given bond-rotation angle and the deviation of the surface anion from its ideal, bulk-terminated position decrease with increasing ionicity. In addition, the contraction of the top-layer anion-cation bond, relative to the bulk bond length, increases with increasing ionicity. C1 SRI INT,MENLO PK,CA 94025. INST HALBLEITERPHYS,O-1200 FRANKFURT,GERMANY. RP KLEPEIS, JE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 15 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1463 EP 1466 DI 10.1116/1.586913 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000042 ER PT J AU KIM, CY CAO, RY PIANETTA, P AF KIM, CY CAO, RY PIANETTA, P TI FERMI-LEVEL VARIATION ON GAAS(110) SURFACE WITH SB OVERLAYER STUDIED WITH A PHOTOELECTRON MICROSCOPE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID III-V-SEMICONDUCTORS; 110 SURFACES; SB/GAAS(110); GAAS AB Bare and Sb covered GaAs(110) surfaces were studied with a photoelectron microscope. For the cleaved surfaces, maximum band bendings of 0.85 and 0.50 eV was observed for n- and p-type GaAs, respectively. For n-type, evaporation of Sb reduces the band bending from 0.85 to 0.55 eV. Annealing p-GaAs at 350-degrees-C almost restored the flatband condition for an initially unpinned area. A reduction of band bending was observed for an initially heavily pinned area. This suggests that the cleavage defects originate partly from surface strain which can be removed by relaxing the strain with the formation of an ordered Sb overlayer. Sb desorbs from the GaAs surfaces when annealed at 560-degrees-C. The Fermi level on this surface is at 0.35 eV above the valence-band maximum regardless of initial band bending conditions. The new surface is attributed to the destructive process of Sb desorption. RP KIM, CY (reprint author), STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 18 TC 5 Z9 5 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1575 EP 1578 DI 10.1116/1.586972 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000063 ER PT J AU GILLILAND, GD WOLFORD, DJ BRADLEY, JA KLEM, J JAROS, M AF GILLILAND, GD WOLFORD, DJ BRADLEY, JA KLEM, J JAROS, M TI EXCITON TRANSPORT AND LOCALIZATION IN TYPE-II GAAS/ALAS SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID GAAS-ALAS SUPERLATTICES; QUANTUM-WELL STRUCTURES; MOLECULAR-BEAM EPITAXY; BAND-STRUCTURE; DOUBLE HETEROSTRUCTURES; ELECTRONIC-PROPERTIES; PRESSURE-DEPENDENCE; SUPER-LATTICE; BOUND-STATES; SEMICONDUCTORS AB We have measured directly the transport of excitons in a type-II short-period GaAs/AlAs superlattice. We find the transport is laser-power dependent, and, at low powers or long times, is diffusive. At low powers, we find diffusion constants which increase monotonically from 2 X 10(-3) cm2/s at 1.8 K to approximately 7.0 cm2/s at 30 K. Our results confirm the existence of exciton localization and thermally activated hopping. Implications of these results are discussed. C1 IBM CORP,DIV RES,T J WATSON RES CTR,YORKTOWN HTS,NY 10598. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEWCASTLE UPON TYNE,DEPT PHYS,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. RP GILLILAND, GD (reprint author), EMORY UNIV,DEPT PHYS,ATLANTA,GA 30322, USA. NR 38 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1647 EP 1651 DI 10.1116/1.586496 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000076 ER PT J AU HEMSTREET, LA FONG, CY NELSON, JS AF HEMSTREET, LA FONG, CY NELSON, JS TI EFFECT OF INTERFACIAL BOND TYPE ON THE ELECTRONIC AND STRUCTURAL-PROPERTIES OF GASB/INAS SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID QUASIPARTICLE ENERGIES; MOLECULAR-DYNAMICS; BAND-GAPS; PSEUDOPOTENTIALS; SEMICONDUCTORS; POTENTIALS; INSULATORS AB We have investigated the effects of interfacial bond configuration on the electronic and structural properties of thin (001)GaSb/InAs superlattices by using state-of-the-art ab initio molecular dynamics techniques to calculate the electronic and structural properties of two twelve-atom model GaSb/InAs superlattices which have been constructed to contain only In-Sb (model 1) or Ga-As (model 2) interface bonds, respectively. We find the strain at the the interface to be different in the two cases. In model 1, the In and Sb atoms at the interface move away from each other toward the InAs and GaSb layers, respectively, increasing the interfacial separation (4.3 % greater than in bulk InSb) and compressing the back bonds to the atoms in the layer below the interface. In model 2 the Ga and As atoms move toward each other, decreasing the interplanar separation at the interface (3.2% smaller than in bulk GaAs) and stretching the back bonds to the neighboring Sb and In atoms, respectively. We calculate the valence band offset for the Ga-As bonded structure to be 0. 15 eV smaller than that for the model containing only In-Sb bonds. This smaller band offset leads to more mixing of As p character into the highest lying valence band of the superlattice and results in a 0.015 eV smaller spin-orbit splitting at the valence band edge of the Ga-As bonded structure. This result is consistent with the 0.05 eV larger band pp observed for Ga-As bonded structures in recent photoconductivity measurements made on both Ga-As and In-Sb bonded samples grown by molecular-beam epitaxy. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HEMSTREET, LA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 17 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1693 EP 1696 DI 10.1116/1.586506 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000086 ER PT J AU BERGERON, V FAGAN, ME RADKE, CJ AF BERGERON, V FAGAN, ME RADKE, CJ TI GENERALIZED ENTERING COEFFICIENTS - A CRITERION FOR FOAM STABILITY AGAINST OIL IN POROUS-MEDIA SO LANGMUIR LA English DT Article ID THIN LIQUID-FILMS; CONTACT ANGLES AB The unique mobility-control properties of foam in porous media make it an attractive choice as an injection fluid for enhanced oil recovery. Unfortunately, in many cases oil has a major destabilizing effect on foam. Therefore, it is important to understand how oil destabilizes foam and what surfactant properties lead to increased stability against oil. To explain the stability of foam in porous media in the presence of oil, we generalize the ideas of spreading and entering behavior using Frumkin-Derjaguin wetting theory. This formulation overcomes the inherent deficiencies in the classical spreading and entering coefficients used to explain foam stability against oil. We find that oil-tolerant foam can be produced by making the oil surface ''water wet''. To test our theoretical ideas, we measure foam-flow resistance through 45-70 mum glass beadpacks, surface and interfacial tensions, and disjoining pressure isotherms for foam and pseudoemulsion films for a variety of surfactant/oil systems. Most notably, we measure pseudoemulsion-film disjoining pressure isotherms for the first time and directly establish that pseudoemulsion film stability controls the stability of the foam in the systems we tested. Morever, we demonstrate the correspondence between stable pseudoemulsion films, negative entering behavior, and oil-tolerant foams. C1 LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 50 TC 74 Z9 75 U1 3 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL PY 1993 VL 9 IS 7 BP 1704 EP 1713 DI 10.1021/la00031a017 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LN721 UT WOS:A1993LN72100017 ER PT J AU SUN, L CROOKS, RM RICCO, AJ AF SUN, L CROOKS, RM RICCO, AJ TI MOLECULAR-INTERACTIONS BETWEEN ORGANIZED, SURFACE-CONFINED MONOLAYERS AND VAPOR-PHASE PROBE MOLECULES .5. ACID-BASE INTERACTIONS SO LANGMUIR LA English DT Article ID LANGMUIR-BLODGETT FILMS; TRANSFORM INFRARED-SPECTROSCOPY; ULTRATHIN MULTILAYER FILMS; SELF-ASSEMBLY PROCESS; ELECTRON-TRANSFER; CHARGED SURFACES; CYTOCHROME-C; GOLD; ADSORPTION; IR AB Interactions between self-assembled monolayers containing carboxylic or sulfonic acid terminal groups, and vapor-phase n-alkylamine probe molecules, have been studied using FTIR-external reflectance spectroscopy, mass-sensitive surface acoustic wave devices, and ellipsometry. The results indicate that proton transfer from the surface-acid group to the amine-functionalized probe is controlled by both the proton affinity and the degree of structural ordering of the surface-acid groups. In contrast to bilayers formed by hydrogen bonding between carboxylic acid-terminated monolayers, the bilayer structures that result from proton transfer are stable for periods of many hours. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,DEPT MICROSENSOR 1315,ALBUQUERQUE,NM 87185. RI Ricco, Antonio/A-5273-2010; OI Ricco, Antonio/0000-0002-2355-4984 NR 38 TC 125 Z9 126 U1 0 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL PY 1993 VL 9 IS 7 BP 1775 EP 1780 DI 10.1021/la00031a027 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LN721 UT WOS:A1993LN72100027 ER PT J AU MORRIS, J FRITZ, JS AF MORRIS, J FRITZ, JS TI SEPARATION OF HYDROPHILIC ORGANIC-ACIDS AND SMALL POLAR COMPOUNDS USING MACROPOROUS RESIN COLUMNS SO LC GC-MAGAZINE OF SEPARATION SCIENCE LA English DT Article ID ION-EXCLUSION CHROMATOGRAPHY C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP MORRIS, J (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU ADVANSTAR COMMUNICATIONS PI DULUTH PA 131 W FIRST ST, DULUTH, MN 55802 SN 0888-9090 J9 LC GC-MAG SEP SCI JI LC GC-Mag. Sep. Sci. PD JUL PY 1993 VL 11 IS 7 BP 513 EP 517 PG 5 WC Chemistry, Analytical SC Chemistry GA LJ993 UT WOS:A1993LJ99300009 ER PT J AU BHATTACHARYA, RS RAI, AK AF BHATTACHARYA, RS RAI, AK TI ION-BEAM PROCESSING OF HIGH-TEMPERATURE SOLID-LUBRICATING COATINGS(C) SO LUBRICATION ENGINEERING LA English DT Article DE SOLID LUBRICANT; FRICTION AND WEAR; COATINGS; ION BEAMS; HIGH-TEMPERATURE LUBRICANTS; IBAD; ION BEAM MIXING ID ASSISTED DEPOSITION; FILMS AB Ion beam assisted deposition (IBAD) and ton beam mixing (IBM) were utilized to fabricate self-lubricating coatings of CaF2/Ag and BaF2/CaF2/Ag composites. In IBAD, a low energy (approximately 500 eV) Ar+ bombardment was used in combination with electron beam evaporation of coating materials. In ion beam mixing, magnetron sputter deposition was used to deposit a mixed composite coating of CaF2+Ag which was subsequently ion beam mixed with 1 MeV Ag+ at a fluence of 1 X 10(16) cm-2. The deposited coatings were characterized for composition and microstructure using Rutherford backscattering spectrometry (RBS) and transmission electron microscopy (TEM). The friction and wear tests were carried out in a high-temperature controlled-atmosphere test system utilizing pin-on-disc wear test geometry. Uncoated Si3N4 (NBD-100) spheres were used as the pin-on coated NBD-100 Si3N4 and Rene 41 Ni-base super-alloy discs. Both IBAD and sputtering of BaF2 and CaF2 resulted in a near stoichiometric composition with a very fine microstructure. Friction coefficients below 600-degrees-C were approximately 0.2-0.3 in the case of coated Rene 41 alloy, but were reduced to about 0.1-0.15 at 800-degrees-C for coated Si3N4. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP BHATTACHARYA, RS (reprint author), UES INC,DAYTON,OH 45432, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0024-7154 J9 LUBR ENG JI Lubric. Eng. PD JUL PY 1993 VL 49 IS 7 BP 563 EP 570 PG 8 WC Engineering, Mechanical SC Engineering GA LN270 UT WOS:A1993LN27000006 ER PT J AU SHIELD, JE HSU, CM KRAMER, MJ MERKLE, BD MCCALLUM, RW AF SHIELD, JE HSU, CM KRAMER, MJ MERKLE, BD MCCALLUM, RW TI PREPARATION OF FINE POWDERS FOR ELECTRON-MICROSCOPY INVESTIGATIONS SO MATERIALS CHARACTERIZATION LA English DT Article AB A procedure greatly simplifying the preparation of fine powders for electron microscopy investigations is described. Sample powders are mixed with high-purity ductile metal powders such as Ag or Cu, which are then easily consolidated by die compaction. For applications necessitating a minimal amount of pressure during compaction, the pressing system can be heated, decreasing the flow stress of the ductile metal matrix. The specimens are then thinned by dimpling and ion milling for transmission electron microscopy or polished for scanning electron microscopy. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP SHIELD, JE (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD JUL PY 1993 VL 31 IS 1 BP 33 EP 38 DI 10.1016/1044-5803(93)90042-T PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA LH185 UT WOS:A1993LH18500004 ER PT J AU TORMA, AE WEY, JE PESIC, B AF TORMA, AE WEY, JE PESIC, B TI BIOEXTRACTION OF COBALT FROM COBALTITE SO METALL LA English DT Article ID SOLVENT-EXTRACTION; NICKEL; SEPARATION AB Extraction of cobalt from a cobaltite ore concentrate by Thiobacillus ferrooxidans was investigated. Almost complete cobalt extraction was achieved from leach suspensions containing 5% or less solids. At higher pulp densities the yield of cobalt and arsenic extractions decreased; there is presently no plausible explanation for this phenomenon. Two commercial extractants, Cyanex 272 and Cyanex 302, were evaluated for selectively extracting cobalt from the aqueous phase; Cyanex 302 was the best suited for this purpose. A flowsheet is proposed for bioleaching of cobaltite and solvent extraction of cobalt in a cyclic system. C1 UNIV IDAHO,DEPT MET,MOSCOW,ID 83843. RP TORMA, AE (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83401, USA. NR 39 TC 1 Z9 1 U1 0 U2 0 PU METALL-VERLAG GMBH PI BERLIN 33 PA 18 HUBERTUSALLEE, W-1000 BERLIN 33, GERMANY SN 0026-0746 J9 METALL JI Metall PD JUL PY 1993 VL 47 IS 7 BP 648 EP 651 PG 4 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LT107 UT WOS:A1993LT10700005 ER PT J AU DANTZER, P LUO, W FLANAGAN, TB CLEWLEY, JD AF DANTZER, P LUO, W FLANAGAN, TB CLEWLEY, JD TI CALORIMETRICALLY MEASURED ENTHALPIES FOR THE REACTION OF H2 (G) WITH ZR AND ZR ALLOYS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID HIGH-TEMPERATURE THERMODYNAMICS; INTERSTITIAL SOLUTIONS; HYDROGEN; SYSTEM; EQUILIBRIUM; ZIRCONIUM; TITANIUM; ABSORPTION; PALLADIUM; DEUTERIUM AB The enthalpy for the direct reaction of H-2 (g) With Zr has been measured by calorimetry at moderate, 323 K, and elevated, 928 K, temperatures over a large range of H contents. The elevated temperature enthalpies were determined for solution in the alpha phase, for the (alpha + beta) phases, the beta phase, the (beta + gamma) phases, and the gamma phase. Simultaneously, the equilibrium pressures were measured. A combination of DELTAG(H) = 1/2RT ln p(H-2) values and the enthalpies gives the corresponding entropies. At 323 K, where equilibrium pressures cannot be measured, the enthalpy for the reaction 1/2H-2 (g) + Zr/1.5 --> ZrH1.5/1.5 was determined as -87 +/- 1.5 kJ/mol H. The enthalpy for reaction of H-2 (g) and Zr (2.5 wt pct Nb) has been determined calorimetrically at 323 K and is found to decrease in exothermicity from -86 to -78 kJ/mol H in the range of (H/Zr) values from 0 to 1.5. Enthalpies of reaction were also measured at the same temperature for a two-phase alloy consisting of Zr-rich and Zr2Ni phases with an overall stoichiometry of Zr0.85Ni0.15. C1 UNIV VERMONT,DEPT CHEM,BURLINGTON,VT 05405. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP DANTZER, P (reprint author), CNRS,URA 0446 ISMA,F-91405 ORSAY,FRANCE. NR 47 TC 17 Z9 17 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD JUL PY 1993 VL 24 IS 7 BP 1471 EP 1479 DI 10.1007/BF02646588 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA LK917 UT WOS:A1993LK91700002 ER PT J AU SYN, CK LESUER, DR WOLFENSTINE, J SHERBY, OD AF SYN, CK LESUER, DR WOLFENSTINE, J SHERBY, OD TI LAYER THICKNESS EFFECT ON DUCTILE TENSILE FRACTURE OF ULTRAHIGH CARBON STEEL-BRASS LAMINATES SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID COMPOSITES; BEHAVIOR AB Laminated metal composites containing equal volume percentage of ultrahigh carbon steel (UHCS) and brass were prepared in three different layer thicknesses (750, 200, and 50 mum) by press-bonding and rolling at elevated temperature and were tensile tested at ambient temperature. A dramatic increase in tensile ductility (from 13 to 21 to 60 pct) and a decrease in delamination tendency at the UHCS-brass interfaces were observed as the layer thickness was decreased. The layer thickness effect on ductility is attributed to residual stress whose influence on delamination is decreased as the layer thickness is decreased. Suppression of delamination inhibits neck formation in the UHCS layers, allowing for extended uniform plasticity. For a given layer thickness, the tensile ductility decreases as the ratio of hardness of component layers is increased. C1 UNIV CALIF IRVINE,DEPT MECH ENGN,IRVINE,CA 92727. STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94315. RP SYN, CK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 20 TC 32 Z9 32 U1 4 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD JUL PY 1993 VL 24 IS 7 BP 1647 EP 1653 DI 10.1007/BF02646603 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LK917 UT WOS:A1993LK91700017 ER PT J AU KIEFT, TL AMY, PS BROCKMAN, FJ FREDRICKSON, JK BJORNSTAD, BN ROSACKER, LL AF KIEFT, TL AMY, PS BROCKMAN, FJ FREDRICKSON, JK BJORNSTAD, BN ROSACKER, LL TI MICROBIAL ABUNDANCE AND ACTIVITIES IN RELATION TO WATER POTENTIAL IN THE VADOSE ZONES OF ARID AND SEMIARID SITES SO MICROBIAL ECOLOGY LA English DT Article ID DEEP SUBSURFACE SEDIMENTS; MICROBIOLOGICAL CHARACTERIZATION; PHYSIOLOGICAL DIVERSITY; HETEROTROPHIC BACTERIA; COASTAL-PLAIN; SOIL; ENVIRONMENTS; STARVATION; SURVIVAL; BIOMASS AB Numbers and activities of microorganisms were measured in the vadose zones of three arid and semiarid areas of the western United States, and the influence of water availability was determined. These low-moisture environments have vadose zones that are commonly hundreds of meters thick. The specific sampling locations chosen were on or near U.S. Department of Energy facilities: the Nevada Test Site (NTS), the Idaho National Engineering Laboratory (INEL), and the Hanford Site (HS) in southcentral Washington State. Most of the sampling locations were uncontaminated, but geologically representative of nearby locations with storage and/or leakage of waste compounds in the vadose zone. Lithologies of samples included volcanic tuff, basalt, glaciofluvial and fluvial sediments, and paleosols (buried soils). Samples were collected aseptically, either by drilling bore-holes (INEL and HS), or by excavation within tunnels (NTS) and outcrop faces (paleosols near the HS). Total numbers of microorganisms were counted using direct microscopy, and numbers of culturable microorganisms were determined using plate-count methods. Desiccation-tolerant microorganisms were quantified by plate counts performed after 24 h desiccation of the samples. Mineralization of C-14-labeled glucose and acetate was quantified in samples at their ambient moisture contents, in dried samples, and in moistened samples, to test the hypothesis that water limits microbial activities in vadose zones. Total numbers of microorganisms ranged from log 4.5 to 7.1 cells g-1 dry wt. Culturable counts ranged from log <2 to 6.7 CFU g-1 dry wt, with the highest densities occurring in paleosol (buried soil) samples. Culturable cells appeared to be desiccation-tolerant in nearly all samples that had detectable viable heterotrophs. Water limited mineralization in some, but not all samples, suggesting that an inorganic nutrient or other factor may limit microbial activities in some vadose zone environments. C1 UNIV NEVADA, DEPT BIOL SCI, LAS VEGAS, NV 89154 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP KIEFT, TL (reprint author), NEW MEXICO INST MIN & TECHNOL, DEPT BIOL, SOCORRO, NM 87801 USA. NR 45 TC 66 Z9 68 U1 2 U2 14 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0095-3628 J9 MICROBIAL ECOL JI Microb. Ecol. PD JUL-AUG PY 1993 VL 26 IS 1 BP 59 EP 78 DI 10.1007/BF00166030 PG 20 WC Ecology; Marine & Freshwater Biology; Microbiology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Microbiology GA LT624 UT WOS:A1993LT62400007 PM 24189989 ER PT J AU FONG, CY NELSON, JS YANG, LH AF FONG, CY NELSON, JS YANG, LH TI BONDING PROPERTIES OF THE INTERACTING DONOR AND ACCEPTOR STATES OF SI-DOPED NIPI STRUCTURES IN GAAS SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING LA English DT Article ID P-I STRUCTURES; ELECTRONIC-PROPERTIES; PSEUDOPOTENTIALS; SUPERSTRUCTURE; CRYSTALS AB Two-layer idealized Si-doped NIPI structures in GaAs show (1) non-bonding character for the acceptor state and (2) significant antibonding features for the donor state. These properties cannot be anticipated from the simple bonding picture deduced from the results of the delta-layer NIPI structures-the host crystal can be treated simply as a dielectric background. We attributed (1) to the consequence of minimizing the kinetic energy of the acceptor state to avoid localizing its charge at the Ga atom which is the common nearest neighbor of the two acceptor atoms. The physical origin for (2) is shown to be equivalent to the Coulomb repulsion between the valence states of the host crystal and the donor state. The results of the two-layered NIPI case, especially for the donor state, illustrate explicitly that the occupied states of the host crystal can play an important role in determining the bonding properties of impurity states. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0965-0393 EI 1361-651X J9 MODEL SIMUL MATER SC JI Model. Simul. Mater. Sci. Eng. PD JUL PY 1993 VL 1 IS 4 BP 349 EP 359 DI 10.1088/0965-0393/1/4/001 PG 11 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MP247 UT WOS:A1993MP24700002 ER PT J AU BASKES, MI AF BASKES, MI TI UNTITLED SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING LA English DT Editorial Material C1 SANDIA NATL LABS,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0965-0393 J9 MODEL SIMUL MATER SC JI Model. Simul. Mater. Sci. Eng. PD JUL PY 1993 VL 1 IS 4 BP U349 EP U349 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MP247 UT WOS:A1993MP24700001 ER PT J AU BLACK, TA CAI, YP WOLK, CP AF BLACK, TA CAI, YP WOLK, CP TI SPATIAL EXPRESSION AND AUTOREGULATION OF HETR, A GENE INVOLVED IN THE CONTROL OF HETEROCYST DEVELOPMENT IN ANABAENA SO MOLECULAR MICROBIOLOGY LA English DT Article ID SP-STRAIN PCC-7120; AMINO-ACID SEQUENCE; BLUE-GREEN-ALGA; CYANOBACTERIUM ANABAENA; BACILLUS-SUBTILIS; ESCHERICHIA-COLI; BACTERIAL LUCIFERASE; NUCLEOTIDE-SEQUENCE; PATTERN FORMATION; VIBRIO-HARVEYI AB The spatially patterned differentiation of heterocysts in the filamentous cyanobacterium Anabaena requires a functional hetR gene. Transcriptional fusions to luxAB show that hetR is transcribed at a low level throughout the filament when Anabaena is grown with combined nitrogen, and that induction of the gene begins within 2 h following nitrogen deprivation. By 3.5 h, induction is localized to spaced foci. By 6 h, there is an overall induction of at least threefold in whole cultures, reflecting at least a 20-fold increase within spatially separated cells. The induction requires the presence of a functional hetR gene, indicating that hetR is autoregulatory. Full induction of a heterocyst structural gene, hepA also requires a functional hetR locus. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 35 TC 268 Z9 278 U1 1 U2 10 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0950-382X J9 MOL MICROBIOL JI Mol. Microbiol. PD JUL PY 1993 VL 9 IS 1 BP 77 EP 84 DI 10.1111/j.1365-2958.1993.tb01670.x PG 8 WC Biochemistry & Molecular Biology; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA LL415 UT WOS:A1993LL41500008 PM 8412673 ER PT J AU SABOUNGI, ML HOWE, MA PRICE, DL AF SABOUNGI, ML HOWE, MA PRICE, DL TI STRUCTURE AND DYNAMICS OF MOLTEN ALUMINUM AND GALLIUM TRIHALIDES .1. NEUTRON-DIFFRACTION SO MOLECULAR PHYSICS LA English DT Article AB Diffraction patterns for molten AlBr3, GaBr3 and GaI3 were measured at temperatures close to their melting points using the time-of-flight neutron diffraction technique at the Intense Pulsed Neutron Source at Argonne National Laboratory. The total structure factors exhibit a peak at Q congruent-to 1.2 angstrom-1 which is a signature of intermediate-range order in the melt. The derived coordination numbers indicate a tetrahedral coordination in all three melts, consistent with dimeric M2X6 molecules being the dominant species. The data for aluminium and gallium bromide are in agreement with reference interaction site model calculations based on complete dimerization, while the gallium iodide appears to be only partly dimerized. These conclusions are supported by Raman scattering results in the literature and those of the present authors. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RI Price, David Long/A-8468-2013; Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 24 TC 23 Z9 23 U1 1 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD JUL PY 1993 VL 79 IS 4 BP 847 EP 858 DI 10.1080/00268979300101671 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LQ096 UT WOS:A1993LQ09600014 ER PT J AU TORRIE, BH BINBREK, OS VONDREELE, R AF TORRIE, BH BINBREK, OS VONDREELE, R TI CRYSTAL-STRUCTURE OF CHLOROIODOMETHANE SO MOLECULAR PHYSICS LA English DT Article ID TEMPERATURE AB The crystal structure of phase III of chloroiodomethane-d2 was determined at 13 K using Rietveld refinement of neutron powder profiles. The space group is Pnma (D2h16) and there are four molecules in its orthorhombic unit cell with dimensions a = 6.383(4) angstrom, b = 6.706(1) angstrom and c = 8.867(4) angstrom. The molecules form a 'herringbone' pattern in layers perpendicular to the b axis, similar to that in the halogen and the hydrogen halides crystals. C1 LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,MS H805,LOS ALAMOS,NM 87545. RP TORRIE, BH (reprint author), UNIV WATERLOO,DEPT PHYS,GUELPH WATERLOO PROGRAMME GRAD WORK PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. NR 12 TC 6 Z9 6 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD JUL PY 1993 VL 79 IS 4 BP 869 EP 874 DI 10.1080/00268979300101691 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LQ096 UT WOS:A1993LQ09600016 ER PT J AU AKIMITSU, K HART, LP WALTON, JD AF AKIMITSU, K HART, LP WALTON, JD TI IMMUNOLOGICAL EVIDENCE FOR A CELL-SURFACE RECEPTOR OF VICTORIN USING ANTI-VICTORIN ANTIIDIOTYPIC POLYCLONAL ANTIBODIES SO MOLECULAR PLANT-MICROBE INTERACTIONS LA English DT Article ID HOST-SELECTIVE TOXINS; PHYTOTOXIN VICTORIN; OAT PROTOPLASTS; TISSUES; BINDING AB Anti-victorin anti-idiotypic polyclonal antibodies were raised in rabbits immunized with an anti-victorin polyclonal antibody-ovalbumin conjugate. The presence of anti-victorin anti-idiotypic antibodies in the serum was examined by the inhibition of victorin-horseradish peroxidase (HRP) binding against anti-victorin antibody in a direct enzyme-linked immunosorbent assay (ELISA). Victorin-HRP binding in a direct ELISA was inhibited 84% by addition of a tenfold diluted anti-victorin anti-idiotypic serum. Sera from nonimmunized rabbits did not show significant inhibition. The anti-idiotypic serum diluted 20-fold, induced callose synthesis in protoplasts from victorin-sensitive but not insensitive oat cultivars. When anti-idiotypic antibodies were added simultaneously with 60 pg of victorin per milliliter, they inhibited victorin-induced callose synthesis by 68%. Since anti-idiotypic antibodies are presumed to be too large to enter the cell, these results indicate that victorin acts at the surface of cells. C1 MICHIGAN STATE UNIV,DEPT BOT & PLANT PATHOL,E LANSING,MI 48824. MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,PESTICIDE RECH INST,E LANSING,MI 48824. NR 23 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYTOPATHOLOGICAL SOC PI ST PAUL PA 3340 PILOT KNOB ROAD, ST PAUL, MN 55121 SN 0894-0282 J9 MOL PLANT MICROBE IN JI Mol. Plant-Microbe Interact. PD JUL-AUG PY 1993 VL 6 IS 4 BP 429 EP 433 DI 10.1094/MPMI-6-429 PG 5 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Plant Sciences SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Plant Sciences GA LY143 UT WOS:A1993LY14300004 ER PT J AU APEL, PC PANACCIONE, DG HOLDEN, FR WALTON, JD AF APEL, PC PANACCIONE, DG HOLDEN, FR WALTON, JD TI CLONING AND TARGETED GENE DISRUPTION OF XYL1, A BETA-1,4-XYLANASE GENE FROM THE MAIZE PATHOGEN COCHLIOBOLUS-CARBONUM SO MOLECULAR PLANT-MICROBE INTERACTIONS LA English DT Article DE CELL WALL DEGRADING ENZYME; HOMOLOGOUS RECOMBINATION; HELMINTHOSPORIUM ID BIOSYNTHESIS-INDUCING XYLANASE; COLEOPTILE CELL-WALLS; TRICHODERMA-VIRIDE; MAGNAPORTHE-GRISEA; CUTINASE GENE; POLYSACCHARIDES; ENZYME; ENDOPOLYGALACTURONASE; POLYGALACTURONASE; ENDOXYLANASE AB The gene, XYL1, encoding the major extracellular endobeta1,4-xylanase from the maize pathogen Cochliobolus carbonum was cloned using a synthetic, degenerate oligonucleotide based on a tryptic fragment from the purified enzyme. The deduced product of XYL1 has a M(r) of 20,869 and a predicted pl of 9.1, in good agreement with the measured M(r) and pI of the purified enzyme. The XYL1 product has strong amino acid identity to seven endobeta1, 4-xylanases from six prokaryotes but no obvious similarity to 10 other prokaryotic endoxylanases or a yeast endoxylanase. An internal fragment of the gene was used to create a specific xylanase mutant by transformation-mediated gene disruption via homologous recombination. Total extracellular xylanase activity in the mutant was reduced by 85-94%. When analyzed by cation exchange HPLC, culture filtrates of the mutant and wild type had identical protein profiles, but the mutant lacked the major peak of UV absorption corresponding to the major xylanase activity. Xylanase II activity was also missing in the mutant, but xylanase III activity was still present. The XYL1 mutant grew as well as the wild type on sucrose, on corn cell walls, and on xylan. The pathogenicity of the mutant was indistinguishable from the wild type, indicating that XYL1 is not required for pathogenicity. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. FU NCRR NIH HHS [2-S07-RR07049-15] NR 35 TC 76 Z9 81 U1 0 U2 2 PU AMER PHYTOPATHOLOGICAL SOC PI ST PAUL PA 3340 PILOT KNOB ROAD, ST PAUL, MN 55121 SN 0894-0282 J9 MOL PLANT MICROBE IN JI Mol. Plant-Microbe Interact. PD JUL-AUG PY 1993 VL 6 IS 4 BP 467 EP 473 DI 10.1094/MPMI-6-467 PG 7 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Plant Sciences SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Plant Sciences GA LY143 UT WOS:A1993LY14300008 PM 8400376 ER PT J AU PETROVIC, JJ AF PETROVIC, JJ TI MOSI2-BASED HIGH-TEMPERATURE STRUCTURAL SILICIDES SO MRS BULLETIN LA English DT Article ID MOLYBDENUM DISILICIDE; MECHANICAL-PROPERTIES; THERMAL-EXPANSION; SINGLE-CRYSTALS; MOSI2; COMPOSITES; DEFORMATION; OXIDATION; COATINGS RP PETROVIC, JJ (reprint author), LOS ALAMOS NATL LAB,CERAM SCI & TECHNOL GRP,LOS ALAMOS,NM 87544, USA. NR 26 TC 106 Z9 107 U1 4 U2 13 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUL PY 1993 VL 18 IS 7 BP 35 EP 40 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LM803 UT WOS:A1993LM80300005 ER PT J AU DENBY, B AF DENBY, B TI THE USE OF NEURAL NETWORKS IN HIGH-ENERGY PHYSICS SO NEURAL COMPUTATION LA English DT Review ID PATTERN-RECOGNITION; PARTIAL WIDTH; FIXED TARGET; ALGORITHMS; DECAYS; EVENTS; JETS; Z0 AB In the past few years a wide variety of applications of neural networks to pattern recognition in experimental high-energy physics has appeared. The neural network solutions are in general of high quality, and, in a number of cases, are superior to those obtained using ''traditional'' methods. But neural networks are of particular interest in high-energy physics for another reason as well: much of the pattern recognition must be performed online, that is, in a few microseconds or less. The inherent parallelism of neural network algorithms, and the ability to implement them as very fast hardware devices, may make them an ideal technology for this application. RP DENBY, B (reprint author), FERMILAB NATL ACCELERATOR LAB,MS 318,BATAVIA,IL 60510, USA. NR 73 TC 11 Z9 11 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0899-7667 J9 NEURAL COMPUT JI Neural Comput. PD JUL PY 1993 VL 5 IS 4 BP 505 EP 549 DI 10.1162/neco.1993.5.4.505 PG 45 WC Computer Science, Artificial Intelligence SC Computer Science GA LP133 UT WOS:A1993LP13300001 ER PT J AU SAYER, RO PENG, YKM JARDIN, SC KELLMAN, AG WESLEY, JC AF SAYER, RO PENG, YKM JARDIN, SC KELLMAN, AG WESLEY, JC TI TSC PLASMA HALO SIMULATION OF A DIII-D VERTICAL DISPLACEMENT EPISODE SO NUCLEAR FUSION LA English DT Article ID D TOKAMAK; STABILITY; FLOW AB A benchmark of the Tokamak Simulation Code (TSC) plasma halo model has been achieved by calibration against a DIII-D vertical displacement episode (VDE) consisting of vertical drift, thermal quench and current quench. With a suitable halo surrounding the main plasma, the TSC predictions are in good agreement with experimental results for the plasma current decay, plasma trajectory, toroidal and poloidal vessel currents, and for the magnetic probe and flux loop values for the entire VDE. Simulations with no plasma halo yield much faster vertical motion and significantly worse agreement with the magnetics and flux loop data than do halo simulations. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. GEN ATOM CO,SAN DIEGO,CA 92138. RP SAYER, RO (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Jardin, Stephen/E-9392-2010 NR 13 TC 30 Z9 31 U1 0 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUL PY 1993 VL 33 IS 7 BP 969 EP 978 DI 10.1088/0029-5515/33/7/I01 PG 10 WC Physics, Fluids & Plasmas SC Physics GA MJ108 UT WOS:A1993MJ10800001 ER PT J AU RYTER, F GRUBER, O KARDAUN, OJWF MENZLER, HP WAGNER, F SCHISSEL, DP DEBOO, JC KAYE, SM AF RYTER, F GRUBER, O KARDAUN, OJWF MENZLER, HP WAGNER, F SCHISSEL, DP DEBOO, JC KAYE, SM TI EXPRESSION FOR THE THERMAL H-MODE ENERGY CONFINEMENT TIME UNDER ELM FREE CONDITIONS IN DEUTERIUM SO NUCLEAR FUSION LA English DT Article ID HEATED DIVERTOR DISCHARGES; DIII-D; TOKAMAK AB The design of future tokamaks, which are supposed to reach ignition with the H mode, requires a reliable scaling expression for the H mode energy confinement time. In the present work, an H mode scaling expression for the thermal plasma energy confinement time has been developed by combining data from four existing divertor tokamaks, ASDEX, DIII-D, JET and PBX-M. The plasma conditions, which were as similar as possible to ensure a coherent set of data, were ELM free deuterium discharges heated by deuterium neutral beam injection. By combining four tokamaks, the dependence of the thermal energy confinement on the main plasma parameters, including the three main geometrical variables, was determined. Assuming a power law dependence, one obtains for the H mode in deuterium by linear regression: tau(th) = 0.066I(p) 1.11+/-0.04 P(L)-0.51+/-0.03 R1.75+/-0.08 a-0.30+/-0.07 kappa0.18+/-0.09 B(T)0.15+/-0.07. The density dependence is found to be close to zero. This expression is compared with the existing scaling relations and the differences are analysed. Predictions for ITER are given, and discussed with particular emphasis on the uncertainties. Correcting the data to take the closed divertor of ASDEX into account yields tau(th) = 0.048I(p) 1.10+/-0.04 P(L)-0.51+/-0.03 R1.83+/-0.08 a-0.34+/-0.07 kappa0.61+/-0.09 B(T)0.14+/-0.07 essentially characterized by a smaller numerical factor and a larger kappa dependence. It appears, however, that the predictions for ITER are only weakly changed when this expression is used. Finally, it is shown that taking the improved H mode confinement into account by means of a simple multiplier in front of an L mode confinement scaling expression is valid for ITER, but is not necessarily universally valid. C1 GEN ATOM CO,SAN DIEGO,CA 92138. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP RYTER, F (reprint author), MAX PLANCK INST PLASMA PHYS,EURATOM IPP ASSOC,W-8046 GARCHING,GERMANY. NR 31 TC 15 Z9 15 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUL PY 1993 VL 33 IS 7 BP 979 EP 990 DI 10.1088/0029-5515/33/7/I02 PG 12 WC Physics, Fluids & Plasmas SC Physics GA MJ108 UT WOS:A1993MJ10800002 ER PT J AU STRACHAN, JD BELL, MG BITTER, M BUDNY, RV HAWRYLUK, RJ HILL, KW HSUAN, H JASSBY, DL JOHNSON, LC LEBLANC, B MANSFIELD, DK MARMAR, ES MEADE, DM MIKKELSEN, DR MUELLER, D PARK, HK RAMSEY, AT SCOTT, SD SNIPES, JA SYNAKOWSKI, EJ TAYLOR, G TERRY, JL AF STRACHAN, JD BELL, MG BITTER, M BUDNY, RV HAWRYLUK, RJ HILL, KW HSUAN, H JASSBY, DL JOHNSON, LC LEBLANC, B MANSFIELD, DK MARMAR, ES MEADE, DM MIKKELSEN, DR MUELLER, D PARK, HK RAMSEY, AT SCOTT, SD SNIPES, JA SYNAKOWSKI, EJ TAYLOR, G TERRY, JL TI NEUTRON EMISSION FROM TFTR SUPERSHOTS SO NUCLEAR FUSION LA English DT Article ID FUSION TEST REACTOR; TOKAMAK; TEMPERATURE; CONFINEMENT; PLASMAS AB Empirical scaling relations are deduced describing the neutron emission from TFTR supershots using a database that includes all of the supershot plasmas (525) from the 1990 campaign. A physics based scaling for the neutron emission is derived from the dependence of the central plasma parameters on the machine settings and the energy confinement time. This scaling has been used to project the fusion rate for equivalent DT plasmas in TFTR, and to explore the machine operation space that optimizes the fusion rate. Increases in neutron emission are possible by either increasing the toroidal magnetic field or further improving the limiter conditioning. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP STRACHAN, JD (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 30 TC 24 Z9 25 U1 1 U2 7 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JUL PY 1993 VL 33 IS 7 BP 991 EP 1007 DI 10.1088/0029-5515/33/7/I03 PG 17 WC Physics, Fluids & Plasmas SC Physics GA MJ108 UT WOS:A1993MJ10800003 ER PT J AU WARREN, RW OSHEA, PG BENDER, SC CARLSTEN, BE EARLY, JW FELDMAN, DW FORTGANG, CM GOLDSTEIN, JC SCHMITT, MJ STEIN, WE WILKE, MD ZAUGG, TJ NEWNAM, BE SHEFFIELD, RL AF WARREN, RW OSHEA, PG BENDER, SC CARLSTEN, BE EARLY, JW FELDMAN, DW FORTGANG, CM GOLDSTEIN, JC SCHMITT, MJ STEIN, WE WILKE, MD ZAUGG, TJ NEWNAM, BE SHEFFIELD, RL TI LASING ATTEMPT WITH A MICROWIGGLER ON THE LOS-ALAMOS FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The APEX FEL normally lases near a wavelength of 3 mum using a permanent magnet wiggler with a 2.7-cm period and a linear accelerator of 40-MeV energy. Los Alamos National Laboratory is conducting a series of experiments with the goal of lasing at significantly shorter wavelengths with the same accelerator and the same kind of near-concentric resonator, but using a novel pulsed microwiggler of 0.5-cm period capable of generating a peak field of several tesla. We plan to lase on a fundamental wavelength of approximately 0.8 mum and on the third harmonic at 0.25 mum. RP WARREN, RW (reprint author), LOS ALAMOS NATL LAB,MAIL STOP H825,LOS ALAMOS,NM 87545, USA. NR 7 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 48 EP 51 DI 10.1016/0168-9002(93)90011-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800009 ER PT J AU OSHEA, PG BENDER, SC CARLSTEN, BE EARLY, JW FELDMAN, DW LUMPKIN, AH FELDMAN, RB GOLDSTEIN, JC MCKENNA, KF MARTINEAU, R PITCHER, EJ SCHMITT, MJ STEIN, WE WILKE, MD ZAUGG, TJ AF OSHEA, PG BENDER, SC CARLSTEN, BE EARLY, JW FELDMAN, DW LUMPKIN, AH FELDMAN, RB GOLDSTEIN, JC MCKENNA, KF MARTINEAU, R PITCHER, EJ SCHMITT, MJ STEIN, WE WILKE, MD ZAUGG, TJ TI PERFORMANCE OF THE APEX FREE-ELECTRON LASER AT LOS-ALAMOS-NATIONAL-LABORATORY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The APEX (APLE Prototype Experiment) FEL (free-electron laser) is an advanced technology test-bed for the Average Power Laser Experiment (APLE). APEX is a photoinjector-driven FEL that is currently operated as an oscillator with untapered wigglers. Photocathodes are rapidly becoming the source of choice for high-brightness electron beams to drive high-efficiency FELs. The electron accelerator is a 40-MeV L-band rf linac with a 6-MeV photoinjector. Since the commissioning of the FEL in 1991, we have been engaged in accelerator and laser experiments. We have demonstrated that the accelerator is capable of providing a high-brightness electron beam at high current. Initial lasing has been at wavelengths near 3 mum, and our electron-beam brightness is such that harmonic lasing at much shorter wavelengths is possible. We have recently lased on the third harmonic at 0.83 mum. In this paper, we report the results of the accelerator and FEL performance in the oscillator mode. The results show that a photoinjector can be integrated into an FEL system to produce stable and reliable operation. RP OSHEA, PG (reprint author), LOS ALAMOS NATL LAB,MAIL STOP J579,LOS ALAMOS,NM 87545, USA. NR 14 TC 22 Z9 22 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 62 EP 68 DI 10.1016/0168-9002(93)90014-9 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800012 ER PT J AU BERRYMAN, KW SMITH, TI SWENT, RL AF BERRYMAN, KW SMITH, TI SWENT, RL TI WIGGLER LIMITED LONG-WAVELENGTH OPERATION OF AN FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON-LASER; GAIN AB An important criterion in the design of a free electron laser (FEL) is its expected operating wavelength range. With a fixed wiggler gap, the longest wavelength at which oscillation can occur is set by diffraction losses in the optical resonator. To quantify this, we have carried out a series of measurements to determine the long wavelength limit of the present Stanford FEL. We compare these results with a three dimensional theory of FEL gain and calculations of optical cavity losses. including partial waveguiding. RP BERRYMAN, KW (reprint author), LOS ALAMOS NATL LAB,W W HANSEN EXPTL PHYS LAB,LOS ALAMOS,NM 87545, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 69 EP 72 DI 10.1016/0168-9002(93)90015-A PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800013 ER PT J AU SLATER, JM QUIMBY, DC ROBINSON, KE VALLA, AS ADAMSKI, JL DAVIS, KJ DOWELL, DH GREEGOR, RB KENNEDY, RC PARAZZOLI, CG PISTORESI, DJ RODENBURG, RE ROMERO, JB SHOFFSTALL, DR SICILIANO, JA STARKOVICH, VS TONG, KO VETTER, AM SCHMITT, MJ BUSCH, GE AF SLATER, JM QUIMBY, DC ROBINSON, KE VALLA, AS ADAMSKI, JL DAVIS, KJ DOWELL, DH GREEGOR, RB KENNEDY, RC PARAZZOLI, CG PISTORESI, DJ RODENBURG, RE ROMERO, JB SHOFFSTALL, DR SICILIANO, JA STARKOVICH, VS TONG, KO VETTER, AM SCHMITT, MJ BUSCH, GE TI PROGRESS OF THE AVERAGE POWER LASER EXPERIMENT (APLE) PROGRAM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTRON AB The Average Power Laser (APLE) is a high power free-electron laser demonstration. This paper summarizes progress in the design and selected component testing for a 10 kW oscillator, which is the precursor to a 100 kW oscillator-amplifier system. C1 BOEING DEF & SPACE GRP,SEATTLE,WA 98124. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SLATER, JM (reprint author), STI OPTRON INC,2755 NORTHUP WAY,BELLEVUE,WA 98004, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 168 EP 174 DI 10.1016/0168-9002(93)90037-I PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800035 ER PT J AU SCHMITT, MJ BYRD, DA CARLSTEN, BE ELLIOTT, CJ STEVENS, RR PARAZZOLI, CG PISTORESI, DJ RODENBURG, RE QUIMBY, DC AF SCHMITT, MJ BYRD, DA CARLSTEN, BE ELLIOTT, CJ STEVENS, RR PARAZZOLI, CG PISTORESI, DJ RODENBURG, RE QUIMBY, DC TI DESIGN OF A 10-KW-FEL AT 10 MICRONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID SUPPRESSION AB The major factors impacting the design of a high power 10 kW FEL oscillator are mirror thermal distortion and electron and optical beam loss in the wiggler. Thermal absorption directly impacts the determination of the optimum wiggler gap. Choice of the proper wiggler bore must be made by balancing requirements for electron beam clearance with those for obtaining adequate wiggler magnetic field strength. This balance is further complicated by optical vignetting and achieving an intracavity optical intensity sufficient to taper the wiggler without thermally damaging the resonator mirrors. The final design must also limit the bandwidth of the optical radiation so that the maximum wiggler taper efficiency can be realized. The overall design methodology and final design choices required to meet these various constraints are discussed. C1 BOEING CO,SEATTLE,WA 98124. STI OPTRON,BELLEVUE,WA 98004. RP SCHMITT, MJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 212 EP 217 DI 10.1016/0168-9002(93)90045-J PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800043 ER PT J AU PELLEGRINI, C ROSENZWEIG, J NUHN, HD PIANETTA, P TATCHYN, R WINICK, H BANE, K MORTON, P RAUBENHEIMER, T SEEMAN, J HALBACH, K KIM, KJ KIRZ, J AF PELLEGRINI, C ROSENZWEIG, J NUHN, HD PIANETTA, P TATCHYN, R WINICK, H BANE, K MORTON, P RAUBENHEIMER, T SEEMAN, J HALBACH, K KIM, KJ KIRZ, J TI A 2 TO 4NM HIGH-POWER FEL ON THE SLAC LINAC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID AMPLIFIED SPONTANEOUS EMISSION; FREE-ELECTRON-LASER; DESIGN AB We report the results of preliminary studies of a 2 to 4 nm SASE FEL, using a photoinjector to produce the electron beam, and the SLAC linac to accelerate it to an energy up to 10 GeV. Longitudinal bunch compression is used to increase ten fold the peak current to 2.5 kA, while reducing the bunch length to the subpicosecond range. The saturated output power is in the multi-gigawatt range, producing about 10(14) coherent photons within a bandwidth of about 0.2% rms, in a pulse of several millijoules. At 120 Hz repetition rate the average power is about 1 W. The system is optimized for X-ray microscopy in the water window around 2 to 4 nm, and will permit imaging a biological sample in a single subpicosecond pulse. C1 STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA USA. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94305 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. SUNY, STONY BROOK, NY 11794 USA. RP PELLEGRINI, C (reprint author), UNIV CALIF LOS ANGELES, DEPT PHYS, LOS ANGELES, CA 90024 USA. NR 20 TC 35 Z9 35 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 223 EP 227 DI 10.1016/0168-9002(93)90047-L PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800045 ER PT J AU URBANUS, WH BEST, RWB BONGERS, WA VANINGEN, AM MANINTVELD, P STERK, AB VERHOEVEN, AGA VANDERWIEL, MJ CAPLAN, M BRATMAN, VL DENISOV, GG VARFOLOMEEV, AA KHLEBNIKOV, AS AF URBANUS, WH BEST, RWB BONGERS, WA VANINGEN, AM MANINTVELD, P STERK, AB VERHOEVEN, AGA VANDERWIEL, MJ CAPLAN, M BRATMAN, VL DENISOV, GG VARFOLOMEEV, AA KHLEBNIKOV, AS TI DESIGN OF THE 1-MW, 200-GHZ, FOM FUSION FEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTRON AB The FOM Institute for Plasma Physics has obtained funding for the development of a 1 MW, long pulse, 140-250 GHz free-electron maser. The engineering design is presently being performed in an international collaboration. In this paper the main components of the free-electron maser, the electron beam line, the undulator and the millimetre-wave system, are described. The basic design parameters of these components, which are optimized with the help of a fully 3-D, particle-pusher, FEM simulation code, are reported. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NIZHNY NOVGOROD APPL PHYS INST,NIZHNII NOVGOROD 603600,RUSSIA. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. RP URBANUS, WH (reprint author), EURATOM,FOM,INST PLASMAFYS RIJNHUIZEN,POB 1207,3430 BE NIEUWEGEIN,NETHERLANDS. NR 7 TC 33 Z9 33 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 235 EP 240 DI 10.1016/0168-9002(93)90050-R PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800048 ER PT J AU CAPLAN, M BEST, RWB VERHOEVEN, AGA VANDERWIEL, MJ URBANUS, WH BRATMAN, VL DENISOV, GG AF CAPLAN, M BEST, RWB VERHOEVEN, AGA VANDERWIEL, MJ URBANUS, WH BRATMAN, VL DENISOV, GG TI PREDICTED PERFORMANCE OF A DC BEAM DRIVEN FEM OSCILLATOR DESIGNED FOR FUSION APPLICATIONS AT 200-250 GHZ SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB At the FOM Institute (The Netherlands) a free electron laser using a dc beam with depressed collector is being developed for plasma heating, which will be capable of producing 1 MW cw output over an adjustable tuning range of 200-250 GHz. The basic design parameters for the electron beam, undulator and waveguide circuit are determined using a 3D non-wiggle averaged waveguide mode particle interaction code including ac space charge effects. Novel features of the design include using a step-tapered two-section wiggler to achieve both the high gain (10) and the required efficiency ( approximately 5%) as well as a rectangular corrugated HE11 waveguide circuit to handle the high average power requirements. Results are presented on the FEM performance including dependence on beam emittance, percentage feedback, and operating frequency. C1 EURATOM,FOM,INST PLASMAFYS RIJNHUIZEN,3430 BE NIEUWEGEIN,NETHERLANDS. NIZHNY NOVGOROD APPL PHYS,NIZHNII NOVGOROD 603600,RUSSIA. RP CAPLAN, M (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-640,LIVERMORE,CA 94550, USA. NR 4 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 243 EP 249 DI 10.1016/0168-9002(93)90051-I PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800049 ER PT J AU CARLSTEN, BE GOLDSTEIN, JC PITCHER, EJ SCHMITT, MJ AF CARLSTEN, BE GOLDSTEIN, JC PITCHER, EJ SCHMITT, MJ TI SIMULATIONS OF APEX ACCELERATOR PERFORMANCE IN THE NEW NONTHERMALIZED PHOTOINJECTOR REGIME SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The Los Alamos accelerator FEL facility APEX is the first photoinjector-driven machine operating in the high-charge (greater than one nC), low-emittance (normalized rms emittances less than 5pi mm mrad) regime. Because the electron beam is accelerated quickly and does not have a chance to thermalize, surprising effects are seen. We will analyze and provide numerical examples showing the emittance degradation caused by transverse wakefields and transverse quadrupole rotations. We will also show the formation of a virtual cathode as the injection phase is brought closer to the rf zero-crossing. FEL interaction simulations will be included to differentiate emittance growth mechanisms that degrade FEL performance from those that are transparent to the lasing. RP CARLSTEN, BE (reprint author), LOS ALAMOS NATL LAB,AT-7 GRP,MS H825,LOS ALAMOS,NM 87545, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 307 EP 313 DI 10.1016/0168-9002(93)90064-O PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800062 ER PT J AU GOVIL, R RIMMER, RA SESSLER, AM KIRK, HG AF GOVIL, R RIMMER, RA SESSLER, AM KIRK, HG TI DESIGN OF RF CONDITIONER CAVITIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Theoretical studies are made of radio frequency structures which can be used to condition electron beams so as to greatly reduce the stringent emittance requirements for successful lasing in a free-electron laser. The basic strategy of conditioning calls for modulating an electron beam in the transverse dimension, by a periodic focusing channel, while it traverses a series of rf cavities, each operating in a TM210 mode. In this paper, we analyze the cavities both analytically and numerically (using MAFIA simulations). We find that when cylindrical symmetry is broken the coupling impedance can be greatly enhanced. We present results showing various performance characteristics as a function of cavity parameters, as well as possible designs for conditioning cavities. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP GOVIL, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 335 EP 339 DI 10.1016/0168-9002(93)90070-X PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800068 ER PT J AU KIM, KJ XIE, M AF KIM, KJ XIE, M TI SELF-AMPLIFIED SPONTANEOUS EMISSION FOR SHORT-WAVELENGTH COHERENT RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON-LASER; HIGH-GAIN REGIME; FEL; OPERATION AB We review the recent progress in our understanding of the self-amplified spontaneous emission (SASE), emphasizing the application to short wavelength generation. Simple formulae are given for the startup, exponential gain and the saturation of SASE. Accelerator technologies producing high brightness electron beams required for short wavelength SASE are discussed. An example utilizing electron beams for a photocathode-linac system to produce 4 nm SASE in the multigigawatt range is presented. RP KIM, KJ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 30 TC 49 Z9 49 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 359 EP 364 DI 10.1016/0168-9002(93)90072-P PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800072 ER PT J AU TAKEDA, H DOWELL, D AF TAKEDA, H DOWELL, D TI MODELING THE APLE INJECTOR SOLENOID MAGNETIC-FIELD WITH THE BIOT-SAVART LAW SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The APLE (Average Power Laser Experiment) photoinjector uses four cavities to accelerate electrons to 5 MeV. A solenoid placed between the first two cavities focuses the low energy (1.2-MeV) electron beam. Once the beam profile at the photocathode is determined, the beam transport and the beam quality of the injector depend on the detailed field profile of the solenoid. Previous study showed that the stacked current loops with a canted common axis could not describe the measured magnetic field profile. In this paper, we modeled the fields accurately by integrating the fields from each section of the solenoid using the Biot-Savart law. By comparing the measured profiles with the calculated profiles of transverse magnetic fields on the beam axis z, we determined the angle of the solenoid axis by a best match of transverse field components. We then implemented the Biot-Savart algorithm in the particle simulation code PARMELA and calculated beam qualities at optimized injector conditions. This study shows that the transverse fields calculated from the Biot-Savart law for a canted solenoid can describe the asymmetric profiles. Also the degree of sensitivity to the transverse field from the misaligned solenoid was revealed through the calculations. C1 BOEING AEROSP & ELECTR CO,SEATTLE,WA. RP TAKEDA, H (reprint author), LOS ALAMOS NATL LAB,MS F645,LOS ALAMOS,NM 87544, USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 384 EP 389 DI 10.1016/0168-9002(93)90076-T PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800076 ER PT J AU CHIN, YH AF CHIN, YH TI SIMPLE FORMULAS FOR THE OPTIMIZATION OF THE FEL GAIN LENGTH INCLUDING THE EFFECTS OF EMITTANCE, BETATRON OSCILLATIONS AND ENERGY SPREAD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTRON AB Simple analytical formulae are presented for a quick optimization of the free electron laser (FEL) gain length for given values of radiation wavelength, electron beam current, normalized transverse emittance and energy spread. The optimization parameters include the gap size of the wiggler, the wiggler period and the betatron wavelength (in the case of external focusing). The method is based on the handy formulae for the FEL gain of a Gaussian beam [Y.H. Chin et al., Nucl. Instr. and Meth. A318 (1992) 481] including the effects of energy spread, emittance, and betatron oscillations of the electron beam. We have found a simple relation between the minimum FEL gain length and the optimum betatron wavelength for given energy spread, emittance, and gap size of the wiggler. When the emittance is about the radiation wavelength divided by 4pi and the energy spread is negligible, this relation shows that the gain length is optimized if the betatron wavelength is chosen so that the betatron phase advances by a half radian in the gain length. RP CHIN, YH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 424 EP 428 DI 10.1016/0168-9002(93)90084-U PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800084 ER PT J AU CHIN, YH KIM, KJ XIE, M AF CHIN, YH KIM, KJ XIE, M TI CALCULATION OF 3-D FREE-ELECTRON LASER GAIN - COMPARISON WITH SIMULATION AND GENERALIZATION TO ELLIPTIC CROSS-SECTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB In a previous paper [Y.H. Chin, K.-J. Kim and M. Xie, Nucl. Instr. and Meth. A318 (1992) 481], we have derived a dispersion relation for the free electron laser (FEL) gain in the exponential regime taking the diffraction and electron's betatron oscillation into account. Here we compare the growth rates obtained by solving the dispersion relation with those obtained by simulation calculation for the waterbag and the Gaussian models for the electron's transverse phase space distribution. The agreement is found to be good except for the limiting case where the Rayleigh length is much longer than the gain length (I-D limit). We also generalize the analysis to the case where the electron beam cross section is elliptical as is usually the case in storage rings, and derive the first-order dispersion relation. RP CHIN, YH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 429 EP 436 DI 10.1016/0168-9002(93)90085-V PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800085 ER PT J AU BURKE, AT SCHMITT, MJ GOLDSTEIN, JC RIDE, SK AF BURKE, AT SCHMITT, MJ GOLDSTEIN, JC RIDE, SK TI SIMULTANEOUS OPERATION OF A FREE-ELECTRON LASER ON 2 HARMONICALLY RELATED WAVELENGTHS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID RADIATION AB The interacion of light at the fundamental and the third harmonic frequencies in a free-electron laser (FEL) oscillator is explored using the 1-D finite-pulse-mode code HFELP. The code, which assumes that only the TEM00 transverse mode is present at both harmonic frequencies, tracks the temporally-finite pulse electric field amplitudes of the fundamental and the third harmonic as they interact with an rf-linac-generated electron micropulse inside a wiggler. The evolution of the pulse profiles is tracked over many passes through the wiggler and optical resonator, for various initial conditions including frequency-dependent mirror reflectivities. Results include pulse-dependent third-harmonic coherent-spontaneous emission (CSE) with, and without, multiple-pass interference effects; the effects of fundamental sidebands on third-harmonic CSE: and lasing competition between the fundamental and third harmonic in overlapping spatial regions of the electron micropulse. C1 LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP BURKE, AT (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 467 EP 471 DI 10.1016/0168-9002(93)90090-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800090 ER PT J AU BARLETTA, WA SESSLER, AM YU, LH AF BARLETTA, WA SESSLER, AM YU, LH TI PHYSICALLY TRANSPARENT FORMULATION OF A FREE-ELECTRON LASER IN THE LINEAR GAIN REGIME SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The recent 2-dimensional analytic theories of a free-electron laser (FEL) in the linear regime are reformulated in terms of three dimensionless ratios that describe the degree to which the characteristics of the electron beam deviate from the cold beam limit of a beam with no emittance or energy spread. In terms of these ratios, algebraic model equations of a fit that combines features of both of the 2-dimensional analyses are given as a convenient computational tool. Graphs of the FEL gain eigenvalue computed with the combined 2-D formulation illustrate that the gain and the output power at saturation are reduced from the 1-D value, when any of the ratios is larger than unity. C1 UNIV CALIF LOS ANGELES, DEPT PHYS, LOS ANGELES, CA USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP BARLETTA, WA (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 6 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 491 EP 495 DI 10.1016/0168-9002(93)90095-Y PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800095 ER PT J AU LEEMANS, WP EDIGHOFFER, JA KIM, KJ CHATTOPADHYAY, S SCHWETTMAN, HA AF LEEMANS, WP EDIGHOFFER, JA KIM, KJ CHATTOPADHYAY, S SCHWETTMAN, HA TI A TECHNIQUE FOR SINGLE-PULSE SPECTRUM AND PULSE-WIDTH MEASUREMENTS FOR AN IR-FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB A diagnostic system has been designed to measure the spectrum and pulse width of infrared FEL pulses. Use of an image dissector [H.A. Baldis et al., Rev. Sci. Instr. 48 (1977) 173] and a single element high speed detector with integrating sphere, allows one to obtain spectral or temporal information for each individual micro-pulse inside the pulse train. The spectral diagnostic consists of a mode matching telescope, a high resolution spectrometer, an imaging telescope and an image dissector system. The imaging telescope between the spectrograph and the image dissector provides for variable magnification (and hence resolution) of the spectrum onto the image dissector. The pulse width measurement uses single pulse autocorrelation through noncollinear optical mixing in a frequency doubling crystal [S.A. Arakelian et al., Opt. Commun. 44 (1982) 67], an imaging telescope and again an image dissector system. Here, the imaging telescope relays the image of the region in the nonlinear crystal in which second harmonic light was generated onto the image dissector. The design and implementation of these diagnostics for the 1-11 mum on the IR-FEL at Stanford University are discussed. C1 STANFORD UNIV,WW HANSEN EXPTL PHYS LAB,STANFORD,CA 94305. RP LEEMANS, WP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 5 Z9 5 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 615 EP 620 DI 10.1016/0168-9002(93)90122-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800122 ER PT J AU LEEMANS, WP XIE, M EDIGHOFFER, JA WALLACE, E KIM, KJ CHATTOPADHYAY, S AF LEEMANS, WP XIE, M EDIGHOFFER, JA WALLACE, E KIM, KJ CHATTOPADHYAY, S TI EXPERIMENT AND SIMULATION OF HOLE-COUPLED RESONATOR MODES WITH A CW HENE LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Experiments on optical modes of hole-coupled resonators, with parameters relevant to free electron laser cavities, have been carried out using a cw HeNe laser, and compared to simulations using the code HOLD [1]. Excellent agreement between theory and experiment has been obtained for a Gaussian resonator. For specially chosen resonator parameters we have observed mode-degeneracy as predicted by HOLD. RP LEEMANS, WP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 3 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 630 EP 635 DI 10.1016/0168-9002(93)90125-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800125 ER PT J AU KRISHNAGOPAL, S XIE, M KIM, KJ AF KRISHNAGOPAL, S XIE, M KIM, KJ TI SUPPRESSION OF MODE-BEATING IN A SATURATED HOLE-COUPLED FEL OSCILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON LASERS AB In a hole-coupled resonator, either empty or loaded with a linear FEL gain medium, the phenomenon of mode-degeneracy and mode-beating have been studied. When the magnitudes of the eigenvalues, derived from a linear analysis, are equal for two or more dominant eigenmodes, the system cannot achieve a stable beam-profile. We investigate this phenomenon when a saturated FEL is presented within the cavity, thus introducing nonlinearity. We use a three-dimensional FEL oscillator code, based on the amplifier code TDA, and show that mode-beating is suppressed in the nonlinear saturated regime. We suggest a simple, qualitative model for the mechanism responsible for this suppression. RP KRISHNAGOPAL, S (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 654 EP 657 DI 10.1016/0168-9002(93)90130-A PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800130 ER PT J AU ZHANG, X BENZYI, I INGOLD, G KRINSKY, S YU, LH AF ZHANG, X BENZYI, I INGOLD, G KRINSKY, S YU, LH TI ANALYSIS OF THE SUPERCONDUCTING WIGGLER MAGNETS FOR THE ATF HARMONIC-GENERATION FEL EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTRON AB In this paper, we consider the superconducting wiggler magnet under construction for the High Gain Harmonic Generation experiment (HGHG) at the Accelerator Test Facility (ATF) at BNL. This wiggler consists of an energy modulation section, a dispersion magnet and a radiator section. We present an analysis of the dispersion magnet and of the end effects in the other wiggler sections. The purpose of the dispersion magnet is to convert energy modulation of the electron beam into spatial bunching. For the dispersion magnet, we discuss the physical requirements, analyze the magnetic design, determine the focussing properties, and consider the effect of departures from ideal behavior on the FEL gain. In the modulator and radiator wigglers we analyze the effects due to the ends of the wiggler and discuss their correction. In addition, the localized field produced by a trim coil for horizontal beam steering is investigated. RP ZHANG, X (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 689 EP 694 DI 10.1016/0168-9002(93)90137-7 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800137 ER PT J AU SAILOR, WC THODE, LE JUDD, SL HUNDLEY, MF SCHMITT, MJ AF SAILOR, WC THODE, LE JUDD, SL HUNDLEY, MF SCHMITT, MJ TI A CRYOGENIC CW ELECTROMAGNETIC WIGGLER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID PERFORMANCE; DESIGN AB It is shown that a cw electromagnetic wiggler can be constructed from chilled high-purity copper that is capable of delivering higher magnetic field strengths and vector potential, a(w), than either permanent magnet or superconducting wigglers. A model calculation with a 90 MeV beam lasing at 1.7 mum showed a 20% higher a(w) than a superconducting system, giving a 23% shorter wiggler period and 16% higher efficiency. Experimental measurements of magnetoresistive effects in copper are included in this paper. RP SAILOR, WC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 701 EP 705 DI 10.1016/0168-9002(93)90139-9 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800139 ER PT J AU WARREN, RW FORTGANG, CM AF WARREN, RW FORTGANG, CM TI DEVELOPMENT OF A PULSED-MICROWIGGLER SYSTEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTROMAGNET WIGGLER AB Pulsed microwigglers can develop unusually high magnetic fields with short periods. They find potential applications in compact systems that use low energy accelerators that can generate very bright electron beams, and in systems that lase on high harmonics of the fundamental frequency. In the past many of the unique properties of pulsed wigglers have been addressed. In this paper we will concentrate on our solutions to the practical problems that must be solved to make such a device work. Among other topics we will discuss the following: achieving adequate precision in fabrication; controlling quadrupole fields; ''trimming'' the field after fabrication; providing structural support, cooling, and vacuum; and coupling to the pulsed power supply. Completed microwigglers of our design will be installed in an FEL this summer to lase on the fundamental in the red part of the spectrum and on the third harmonic in the ultraviolet. RP WARREN, RW (reprint author), LOS ALAMOS NATL LAB,MAIL STOP H825,LOS ALAMOS,NM 87545, USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 706 EP 710 DI 10.1016/0168-9002(93)90140-D PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800140 ER PT J AU SCHLUETER, RD DEIS, GA AF SCHLUETER, RD DEIS, GA TI A TUNABILITY ENHANCED ELECTROMAGNETIC WIGGLER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB This paper outlines a design technique for attaining much larger on-axis magnetic field tuning ranges in accurate, high magnetic field electromagnetic wigglers than have been heretofore possible. The general theory of ''tunability enhancement'' is described, followed by specific application to the magnetics design of the wiggler for the intense microwave prototype (IMP) free electron laser at the Lawrence Livermore National Laboratory. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SCHLUETER, RD (reprint author), LAWRENCE BERKELEY LAB,MS 2-400,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 2 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 711 EP 714 DI 10.1016/0168-9002(93)90141-4 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800141 ER PT J AU ELLIOTT, CJ FRANK, JM THODE, LE AF ELLIOTT, CJ FRANK, JM THODE, LE TI DETRAPPING FROM MAGNETIC-FIELD ERRORS AS A RANDOM-WALK ESCAPE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON LASERS; TRAJECTORY STRAIGHTENER ISSUES; WIGGLER AB We examine the effects of random magnetic field errors on the performance of a free electron laser. We report a modification of the straightest wiggler orbit operating point (SWOOP) theory for two very high efficiency systems. The first system utilizes a gapless pulsed cryogenic wiggler and the second a continuous wave gapless superconduction wiggler. We further show a method to improve the choice of separation of correctors. To establish this method we show that corrected steering errors, BPM errors and gap misadjustments are errors similarly construed as phase errors (ESCAPE). The corrected steering errors also have a component that requires retuning of the wiggler and this task is relegated to unoptimized SWOOP. Without this retuning, these errors are similar to an effective emittance, but because the steering errors are homogeneous and the emittance is inhomogeneous, the emittance cannot be removed by retuning except for the resonant particle. The remaining part of the field errors are similar to phase errors and behave like a random force in the KMR potential. In a retuned wiggler, the effective energy broadening from emittance is responsible for the initial trapping and the field errors are responsible for the detrapping. This work constitutes a complete high-efficiency model of phase, gap and corrected steering errors for an ensemble of free electron lasers. The classical bound-free transition, the detrapping phenomenon, is treated as the Kramers problem. RP ELLIOTT, CJ (reprint author), LOS ALAMOS NATL LAB,DIV X,LOS ALAMOS,NM 87545, USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 752 EP 758 DI 10.1016/0168-9002(93)90151-7 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800151 ER PT J AU LUMPKIN, AH WILKE, MD AF LUMPKIN, AH WILKE, MD TI COMMENTS ON ADVANCED, TIME-RESOLVED IMAGING TECHNIQUES FOR FREE-ELECTRON LASER EXPERIMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB An extensive set of time-resolved imaging experiments has been performed on rf-linac driven free-electron lasers (FELs) over the past few years. These experiments have addressed both micropulse and macropulse timescales on both the charged-particle beam and the wiggler/undulator outputs (spontaneous emission and lasing). A brief review of first measurements on photoinjector micropulse elongation, submacropulse phase slew in drive lasers, submacropulse wavelength shifts in lasers, etc. is presented. This is followed by discussions of new measurements of 35-MeV electron beam micropulse bunch length ( less-than-or-equal-to 10 ps) using optical transition radiation, some of the first single bend synchrotron radiation beam profile measurements at gamma < 80, and comments on the low-jitter synchroscan streak camera tuner. These techniques will be further developed on the 200-650 MeV linac test stand at the Advanced Photon Source (APS) in the next few years. Such techniques should be adaptable to many of the present FEL designs and to some aspects of the next generation of light sources. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LUMPKIN, AH (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,BLDG 362,ARGONNE,IL 60439, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 781 EP 785 DI 10.1016/0168-9002(93)90157-D PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800157 ER PT J AU CARLSTEN, BE GOLDSTEIN, JC OSHEA, PG PITCHER, EJ AF CARLSTEN, BE GOLDSTEIN, JC OSHEA, PG PITCHER, EJ TI MEASURING EMITTANCE OF NONTHERMALIZED ELECTRON-BEAMS FROM PHOTOINJECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ACCELERATOR; DESIGN AB The Los Alamos free-electron laser (FEL) facility APEX is the first high-charge (greater than 1 nC), low-emittance (normalized rms emittance less than 5pi mm mrad) photoinjector-driven accelerator. The rapid beam acceleration, which is essential for maintaining high brightness, also prevents the beam from thermalizing its distribution. As a result, the phase-space the electron beam occupies appears as a contorted structure with a large surface area but little volume. The transverse beam shape is mostly non-Gaussian, often with a large halo at beam waists. This shape-often results in unusual effects, some of which are outlined in another paper for this conference. In this paper, we will examine how this physical property influences emittance measurement techniques, such as quadrupole scans and beam filtering through tubes and slits. We will show that common emittance measurement techniques typically underestimate the rms emittance by factors of two or more. We will also discuss the beam quality relevant to FEL interaction. RP CARLSTEN, BE (reprint author), LOS ALAMOS NATL LAB,GRP AT7,MS H825,LOS ALAMOS,NM 87545, USA. NR 6 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 791 EP 796 DI 10.1016/0168-9002(93)90159-F PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800159 ER PT J AU LUMPKIN, AH DECKER, G KAHANA, E PATTERSON, D SELLYEY, W WANG, X CHUNG, Y AF LUMPKIN, AH DECKER, G KAHANA, E PATTERSON, D SELLYEY, W WANG, X CHUNG, Y TI CHARGED-PARTICLE BEAM DIAGNOSTICS FOR THE ADVANCED PHOTON SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Plans, prototypes, and initial test results for the charged-particle beam (e-, e+) diagnostic systems on the injector rings, their transport lines, and the storage ring for the Advanced Photon Source (APS) are presented. The APS will be a synchrotron radiation user facility with one of the world's brightest X-ray sources in the 10-keV to 100-keV regime. Its 200-MeV electron linac, 450-MeV positron linac, positron accumulator ring, 7-GeV injector synchrotron (IS), 7-GeV storage ring (SR), and undulator test lines will also demand the development and demonstration of key particle-beam characterization techniques over a wide range of parameter space. Some of these parameter values overlap or approach those projected for fourth generation light sources (linac-driven FELs and high brightness storage rings) as described at a recent workshop. Initial results from the diagnostics prototypes on the linac test stand operating at 45-MeV include current monitor data, beam loss monitor data, and video digitization using VME architecture. RP LUMPKIN, AH (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,BLDG 362,ARGONNE,IL 60439, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 797 EP 802 DI 10.1016/0168-9002(93)90160-J PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800160 ER PT J AU LUMPKIN, AH WILKE, MD AF LUMPKIN, AH WILKE, MD TI TIME-RESOLVED ELECTRON-BEAM CHARACTERIZATIONS WITH OPTICAL-TRANSITION RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Time-resolved characterizations of electron beams using optical transition radiation (OTR) as a prompt conversion mechanism have recently been extended on the Los Alamos free-electron Laser (FEL) facility 40-MeV linac. Two key timescales for rf-linac driven FELs are the micropulse (10 ps) and the macropulse (5 mus to 1 ms). In the past we have used gated, intensified cameras to select a single or few micropulses (25-400 ns gate width) out of the pulse train to evaluate submacropulse effects. Recently, we have obtained some of the first measurements of micropulse bunch length (7-10 ps) and submacropulse spatial position and profile using OTR and a Hamamatsu streak camera. Additionally, micropulse elongation effects and head-to-tail transverse kicks are reported as a function of charge. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP LUMPKIN, AH (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,BLDG 362,ARGONNE,IL 60439, USA. NR 11 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 803 EP 808 DI 10.1016/0168-9002(93)90161-A PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800161 ER PT J AU BENZVI, I YU, LH GOVIL, R SESSLER, AM AF BENZVI, I YU, LH GOVIL, R SESSLER, AM TI A PROPOSED EXPERIMENT FOR BEAM CONDITIONING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB An experiment on beam conditioning [1] is proposed for the Accelerator Test Facility (ATF) at Brookhaven National Laboratory. The proposed demonstration will employ the already approved Harmonic Generation FEL [2] experiment (HGFEL) at the facility. The HGFEL experiment will use a 30 MeV electron beam from the ATF and a seed laser to produce a 3.4 mum radiation from a superconducting wiggler with a 1.8 cm period. In the proposed experiment, the beam energy is reduced to 17 MeV, and only the second wiggler of the HGFEL is employed. Resonance is made at 10.6 mum. The demonstration involves spoiling the emittance to drastically reduce the output power. A beam conditioning section introduces momentum variations correlated with betatron amplitude. This correlation will correct the deleterious effects of the artificially introduced emittance increase thus providing a clear demonstration of the conditioner. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BENZVI, I (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP ABS1 EP ABS3 DI 10.1016/0168-9002(93)90164-D PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800164 ER PT J AU KRISHNAGOPAL, S RANGARAJAN, G SESSLER, A AF KRISHNAGOPAL, S RANGARAJAN, G SESSLER, A TI NUMERICAL-STUDIES OF THE MULTICAVITY FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Consideration is made of a free-electron laser with many optical cavities where the cavities communicate with each other, not optically, but through the electron beam. Numerical simulation results in the one-dimensional approximation, but including nonlinearities, are presented. The multi-cavity free-electron laser (MC/FEL) can be employed to avoid the slippage phenomena, and thus to make pico-second pulses of infrared radiation. Three examples of this application are presented. RP KRISHNAGOPAL, S (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP ABS22 EP ABS25 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800172 ER PT J AU SIGMUND, P AF SIGMUND, P TI NOTE ON ISOTOPE SPUTTERING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Letter ID ALLOYS C1 ODENSE UNIV,DEPT PHYS,DK-5230 ODENSE,DENMARK. RP SIGMUND, P (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Sigmund, Peter/B-1115-2012 OI Sigmund, Peter/0000-0002-2959-1305 NR 9 TC 8 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1993 VL 82 IS 1 BP 192 EP 193 DI 10.1016/0168-583X(93)95101-A PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LN446 UT WOS:A1993LN44600027 ER PT J AU HOU, M ECKSTEIN, W ROBINSON, MT AF HOU, M ECKSTEIN, W ROBINSON, MT TI COMPUTER-SIMULATION OF TEMPORAL ASPECTS OF THE COPPER SINGLE-CRYSTAL SPUTTERING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT SYMP ON FUNDAMENTAL PROCESSES IN SPUTTERING OF ATOMS AND MOLECULES, ON THE OCCASION OF THE 250TH ANNIVERSARY OF THE ROYAL ACADEMY OF SCIENCE AND LETTERS CY AUG 30-SEP 04, 1992 CL COPENHAGEN, DENMARK SP ROYAL ACAD SCI & LETT ID BINARY-COLLISION APPROXIMATION; SOLIDS; CLUSTERS; CASCADES; EMISSION; IONS AB Temporal aspects of the sputtering of copper single crystals are studied by computer simulation in the binary collision approximation with MARLOWE. The self-sputtering of a Cu(100) crystal with primary energies ranging from 1 to 100 keV is selected as a case study. In the case of normal incidence, most of the atoms are found to be ejected in the first part of the cascade development. This characteristic changes however, either if the primary energy is small or if the angle of incidence with respect to the surface normal is large. The sputtering time distributions are found to be influenced by the binding energy of the atoms to their lattice sites and the magnitude of the effect is estimated. These time distributions are generally found to be skewed toward long delays after the impact of the projectile and replacement sequences are found to be partially responsible for this. Time correlations in the energy and the momentum transported by the atoms through the surface toward vacuum are studied and an important contribution of the surface refraction by the binding potential is found. Analysis of the relative emission energies within limited delays reveals that the fraction of quasi-simultaneously ejected first neighbors is not sufficient to explain available experimental results on cluster emission resulting from the irradiation of a copper (111) surface by argon ions. C1 MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP HOU, M (reprint author), UNIV LIBRE BRUXELLES,CP 234,BLVD TRIOMPHE,B-1050 BRUSSELS,BELGIUM. NR 36 TC 5 Z9 5 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1993 VL 82 IS 2 BP 234 EP 241 DI 10.1016/0168-583X(93)96025-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LP128 UT WOS:A1993LP12800003 ER PT J AU SIGMUND, P OLIVA, A AF SIGMUND, P OLIVA, A TI ALLOY SPUTTERING AT HIGH FLUENCE - PREFERENTIAL SPUTTERING AND COMPETING EFFECTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT SYMP ON FUNDAMENTAL PROCESSES IN SPUTTERING OF ATOMS AND MOLECULES, ON THE OCCASION OF THE 250TH ANNIVERSARY OF THE ROYAL ACADEMY OF SCIENCE AND LETTERS CY AUG 30-SEP 04, 1992 CL COPENHAGEN, DENMARK SP ROYAL ACAD SCI & LETT ID MULTICOMPONENT MATERIALS; ION-BOMBARDMENT; RECOIL IMPLANTATION; CU-NI; SEGREGATION; DEPTH; TARGETS AB This work addresses composition profiles and partial sputter yields of an alloy under ion bombardment. The effects of preferential sputtering, mixing, and Gibbsian segregation have been modelled. The theoretical basis is an integro-differential equation derived previously, into which a feasible expression for a segregation current has been included. A dependence on composition of pertinent input parameters like relocation cross sections and atomic volumes has been allowed for but has not been explored explicitly. In the limit of high fluence, a stationary state may be reached with a composition profile that shows more or less pronounced deviations from bulk stoichiometry. Two methods have been designed for direct determination of such stationary solutions. An iterative scheme for numerical solution of the nonlinear balance equation is very efficient and accurate. An approximate scheme, assuming weakly preferential behavior and thus based on a linearized balance equation, turns out to be quite accurate even in case of strongly preferential sputtering. An explicit analytical solution is given for a particular example. On the basis of simple, schematic input, it is seen that the deviation of a stationary composition profile from bulk stoichiometry may be very strong, even when the sputter cross section is only weakly or moderately preferential. This difference is most pronounced in the absence of substantial feeding by mixing and segregation. In case of a nonzero depth of origin of sputtered atoms, composition profiles depend sensitively on the depth dependence of the sputter cross section, even in cases where consideration of only the partial sputter yields would suggest stoichiometric sputtering. A few examples illustrate explicitly the competition between preferential sputtering on the one hand, and mixing or segregation on the other. C1 UNIV CALABRIA,DEPT PHYS,I-87036 RENDE,ITALY. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP SIGMUND, P (reprint author), ODENSE UNIV,DEPT PHYS,CAMPUSVEJ 55,DK-5230 ODENSE,DENMARK. RI Sigmund, Peter/B-1115-2012 OI Sigmund, Peter/0000-0002-2959-1305 NR 32 TC 28 Z9 28 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1993 VL 82 IS 2 BP 269 EP 282 DI 10.1016/0168-583X(93)96029-C PG 14 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LP128 UT WOS:A1993LP12800007 ER PT J AU COON, SR CALAWAY, WF PELLIN, MJ CURLEE, GA WHITE, JM AF COON, SR CALAWAY, WF PELLIN, MJ CURLEE, GA WHITE, JM TI KINETIC-ENERGY DISTRIBUTIONS OF SPUTTERED NEUTRAL ALUMINUM CLUSTERS - AL-AL6 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID SINGLE-CRYSTAL SURFACES; ANGLE-INTEGRATED YIELDS; ION-BOMBARDMENT; AR+-IONS; UNIMOLECULAR DECOMPOSITION; RESONANCE IONIZATION; MASS-SPECTROSCOPY; SULFUR MOLECULES; METAL-CLUSTERS; EMISSION AB Neutral aluminum clusters sputtered from polycrystalline aluminum were analyzed by laser postionization time-of-flight (TOF) mass spectrometry. The kinetic energy distributions of Al through Al6 were measured by a time-of-flight technique. The interpretation of laser postionization TOF data to extract velocity and energy distributions is presented. The aluminum cluster distributions are qualitatively similar to previous copper cluster distribution measurements from our laboratory. In contrast to the steep high energy tails predicted by the single- or multiple-collision models, the measured cluster distributions have high energy power law dependences in the range of E-3 to E-4.5. Correlated collision models may explain the substantial abundance of energetic clusters that are observed in these experiments. The possible influences of cluster fragmentation on the distributions are discussed. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. TRINITY UNIV, DEPT PHYS, SAN ANTONIO, TX 78712 USA. UNIV TEXAS, DEPT CHEM, AUSTIN, TX 78712 USA. RP ARGONNE NATL LAB, DIV CHEM TECHNOL, ARGONNE, IL 60439 USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 68 TC 51 Z9 51 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1993 VL 82 IS 2 BP 329 EP 336 DI 10.1016/0168-583X(93)96036-C PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LP128 UT WOS:A1993LP12800014 ER PT J AU BALDWIN, RM ZEAPONCE, Y ZOGHBI, SS LAURELLE, M ALTIKRITI, MS SYBIRSKA, EH MALISON, RT NEUMEYER, JL MILIUS, RA WANG, SY STABIN, M SMITH, EO CHARNEY, DS HOFFER, PB INNIS, RB AF BALDWIN, RM ZEAPONCE, Y ZOGHBI, SS LAURELLE, M ALTIKRITI, MS SYBIRSKA, EH MALISON, RT NEUMEYER, JL MILIUS, RA WANG, SY STABIN, M SMITH, EO CHARNEY, DS HOFFER, PB INNIS, RB TI EVALUATION OF THE MONOAMINE UPTAKE SITE LIGAND [I-123] METHYL 3-BETA-(4-IODOPHENYL)-TROPANE-2-BETA-CARBOXYLATE ([I-123)BETA-CIT) IN NONHUMAN-PRIMATES - PHARMACOKINETICS, BIODISTRIBUTION AND SPECT BRAIN IMAGING COREGISTERED WITH MRI SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; COCAINE BINDING-SITES; DOPAMINE TRANSPORTER; PARKINSONS-DISEASE; H-3 PAROXETINE; REUPTAKE SITES; CLONING; LOCALIZATION; EXPRESSION; RECEPTOR AB The in vivo properties of a new radioiodinated probe of the dopamine and serotonin transporter, [I-123]Methyl 3beta-(4-iodophenyl)tropane-2beta-carboxylate ([I-123]beta-CIT) were evaluated in baboons and vervet monkeys. The labeled product was prepared in 65.2 +/- 2.8% yield (mean +/- SEM; n = 18) by reaction of the tributylstannyl precursor with [I-123]NaI in the presence of peracetic acid followed by high pressure liquid chromatography (HPLC) purification to give a product with radiochemical purity of 97.5 +/- 0.5% and specific activity of 500-1200 Ci/mmol. After intravenous administration, whole brain activity peaked at 6-10% injected dose within 1 h post injection (p.i.) and washed out in a biphasic manner with clearance half-lives of 1-2 and 7-35 h for the rapid and slow components, respectively. Excretion occurred primarily through the hepatobiliary route, with about 30% of the injected dose appearing in the GI tract after 5 h. Estimates of radiation absorbed dose gave 0.01, 0.1, 0.2 and 0.03 mGy/MBq to the brain, gall bladder wall, lower large intestine wall and urinary bladder wall, respectively. High resolution SPECT imaging in a baboon demonstrated high uptake of tracer in the region of the striatum (striatum:cerebellum ratio 4.0), in the hypothalamus (ratio 2.6) and in a midbrain region comprising raphe, substantia nigra and superior colliculus (ratio 2.0), with regional brain uptakes measured at 210 min p.i. of [I-123]beta-CIT. The anatomical locations of the regions on the SPECT image were confirmed by coregistration with MRI. Plasma metabolites and pharmacokinetics were analyzed in baboons and vervets by ethyl acetate extraction and HPLC. The major metabolite was a polar, non-extractable fraction, which increased to > 50% of the plasma activity by 30-45 min p.i. A minor lipophilic (extractable) metabolite was also observed, increasing to about 4% at 2 3 h p.i. The plasma protein bound fraction, determined by ultrafiltration. was 74.8 +/- 1.4% (n = 6). The arterial input function was characterized by the sum of three exponential terms with half-lives of 0.3-1.7, 9.7-24.9 and 77-166 min, respectively, for the concentration of free parent compound. [I-123]beta-CIT promises to be a useful marker for SPECT study of the monoamine uptake system in primate brain. C1 YALE UNIV,SCH MED,DEPT DIAGNOST RADIOL,W HAVEN,CT 06516. RES BIOCHEM INC,NATICK,MA 01760. OAK RIDGE INST SCI & EDUC,CTR RADIAT INTERNAL DOSIMETRY INFORMAT,OAK RIDGE,TN 37831. RP BALDWIN, RM (reprint author), YALE UNIV,SCH MED,VET AFFAIRS MED CTR,DEPT PSYCHIAT,PSYCHIAT SERV 116A2,950 CAMPBELL AVE,W HAVEN,CT 06516, USA. FU NIDA NIH HHS [P50DA04060, R18DA06190]; NIMH NIH HHS [R43-MH48243] NR 39 TC 89 Z9 89 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD JUL PY 1993 VL 20 IS 5 BP 597 EP 606 DI 10.1016/0969-8051(93)90028-S PG 10 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LK303 UT WOS:A1993LK30300005 PM 8358345 ER PT J AU SANFORD, TWL LORENCE, LJ HALBLEIB, JA KELLY, JG GRIFFIN, PJ POUKEY, JW MCATEE, WH MOCK, RC AF SANFORD, TWL LORENCE, LJ HALBLEIB, JA KELLY, JG GRIFFIN, PJ POUKEY, JW MCATEE, WH MOCK, RC TI PHOTONEUTRON PRODUCTION USING BREMSSTRAHLUNG FROM THE 14-TW PULSED-POWER HERMES-III ELECTRON-ACCELERATOR SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID MONOENERGETIC PHOTONS; CROSS-SECTIONS; RESONANCE; DYNAMICS; 700-KA; DIODE; FLOW AB An intense reusable source of pulsed photoneutrons is developed that produces approximately 0.5 or 1.0 X 10(14) neutrons in an approximately 15-ns pulse from natural lead or depleted uranium, respectively, on the HERMES III electron accelerator. Corresponding to this source, a numerical model is developed that is applicable to other pulsed-power systems. If V(p) represents the peak voltage of HERMES III measured in megavolts, then model predictions show that over the range 12 MV < V(p) < 20 MV, the number of neutrons produced per incident electron is 7.2 x 10(-6)(V(p) - 11)2.0 and 1.2 x 10(-6) (V(p) - 7.4)2.8 in lead and uranium, respectively. Measurements using a set of nuclear activation foils confirm these predictions as well as predictions of the spatial and spectral distribution of the neutrons at V(p) = 19 MV. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 43 TC 7 Z9 7 U1 0 U2 5 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUL PY 1993 VL 114 IS 3 BP 190 EP 213 PG 24 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK273 UT WOS:A1993LK27300002 ER PT J AU OLSHER, RH HSU, HH HARVEY, WF AF OLSHER, RH HSU, HH HARVEY, WF TI BENCHMARKING THE MCNP MONTE-CARLO CODE WITH A PHOTON SKYSHINE EXPERIMENT SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The MCNP Monte Carlo transport code is used by the Los Alamos National Laboratory Health and Safety Division for a broad spectrum of radiation shielding calculations. One such application involves the determination of skyshine dose for a variety of photon sources. To verify the accuracy of the code, it was benchmarked with the Kansas State University (KSU) photon skyshine experiment of 1977. The KSU experiment for the unshielded source geometry was simulated in great detail to include the contribution of groundshine, in-silo photon scatter, and the effect of spectral degradation in the source capsule. The standard deviation of the KSU experimental data was stated to be 7%, while the statistical uncertainty of the simulation was kept at or under 1%. The results of the simulation agreed closely with the experimental data, generally to within 6%. At distances of under 100 m from the silo, the modeling of the in-silo scatter was crucial to achieving close agreement with the experiment. Specifically, scatter off the top layer of the source cask accounted for approximately 12% of the dose at 50 m. At distances >300 m, using the Co-60 line spectrum led to a dose overresponse as great as 19% at 700 m. It was necessary to use the actual source spectrum, which includes a Compton tail from photon collisions in the source capsule, to achieve close agreement with experimental data. These results highlight the importance of using Monte Carlo transport techniques to account for the nonideal features of even ''simple experiments.'' RP OLSHER, RH (reprint author), LOS ALAMOS NATL LAB,MAIL STOP G761,POB 1663,LOS ALAMOS,NM 87545, USA. NR 5 TC 8 Z9 9 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUL PY 1993 VL 114 IS 3 BP 219 EP 227 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK273 UT WOS:A1993LK27300004 ER PT J AU GOMES, LM STEVENS, PN AF GOMES, LM STEVENS, PN TI USE OF MONTE-CARLO PROCEDURES TO ESTIMATE 1ST AND 2ND COLLISION SOURCES FOR DISCRETE ORDINATES TRANSPORT CODES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Ray effects, an inherent problem in the formulation of the discrete ordinates approximation to the transport equation, are studied, In particular, the effectiveness of using Monte Carlo procedures to generate a first or second collision source is investigated. Monte Carlo procedures provide a general methodology that can be applied to the discrete ordinates solution of complex problems in either two-dimensional or three-dimensional geometries for which ray effects are likely to occur. The Monte Carlo method, which is intrinsically free of ray effects, performs the transport of the source particle to the first collision sites, at which estimates for the uncollided fluxes are made. The uncollided fluxes are then used to compute the first collided fluxes. The uncollided, collided, or first collided fluxes are calculated as first or second collision scattering sources in a format suitable for input into the DORT two-dimensional and TORT three-dimensional discrete ordinates codes. The computational time and precision requirements of the Monte Carlo calculation are analyzed. The results show that significant improvements are achieved in the solution of test problems when using the estimated first collision source and that ray effects are virtually eliminated when using the estimated second collision source. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. RP GOMES, LM (reprint author), OAK RIDGE NATL LAB,CTR FUS ENGN DESIGN,POB 2009,OAK RIDGE,TN 37831, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUL PY 1993 VL 114 IS 3 BP 228 EP 237 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK273 UT WOS:A1993LK27300005 ER PT J AU BRYSON, JW LEE, JC HASSBERGER, JA AF BRYSON, JW LEE, JC HASSBERGER, JA TI OPTIMAL FLUX MAP GENERATION THROUGH PARAMETER-ESTIMATION TECHNIQUES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Two methods are presented for optimally calculating spatial distributions of neutron flux in a nuclear reactor core. Both techniques, Kalman filtering and maximum likelihood estimation, simultaneously account for all initial information contained in the nominal core specifications and in-core measurements, as well as all of the uncertainties within the system, to provide a minimum variance estimate of neutron flux. These methods resolve discrepancies in the initial information in a statistically optimal manner, thereby providing valuable insight into the nature of the optimal solution obtained. Despite radically different algorithms, both methods yield the same minimum variance estimate for the quantity of interest. The algorithms have been successfully tested for one-dimensional axial and two-dimensional x-y flux mapping problems with simulated in-core data sets. C1 SANDIA NATL LABS,DEPT 6521,ALBUQUERQUE,NM 87185. SALINE HIGH SCH,SALINE,MI 48176. RP BRYSON, JW (reprint author), UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109, USA. NR 25 TC 2 Z9 3 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUL PY 1993 VL 114 IS 3 BP 238 EP 251 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK273 UT WOS:A1993LK27300006 ER PT J AU ADAMS, JP CARBONEAU, ML HAGRMAN, DL AF ADAMS, JP CARBONEAU, ML HAGRMAN, DL TI FISSION-PRODUCT TRANSPORT AND BEHAVIOR DURING 2 POSTULATED LOSS-OF-FLOW TRANSIENTS IN THE ADVANCED TEST REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article DE ADVANCED TEST REACTOR; FISSION PRODUCTS; PROBABILISTIC RISK ASSESSMENT AB The fission product behavior during two postulated loss-of-flow accidents (leading to high- and low-pressure core degradations) in the Advanced Test Reactor (ATR) has been analyzed. These transients are designated ATR transients LCP15 (high pressure) and LPP9 (low pressure). Normally, transients of this nature would be easily mitigated using existing safety systems and procedures. In these analyses, failure of these safety systems was assumed so that core degradation and fission product release could be studied. A probabilistic risk analysis was performed that indicated that the probability of occurrence for these two transients is on the order of 10(-5) and 10(-7) per reactor year for LCP15 and LPP9, respectively. The fission product behavior analysis included calculations of the gaseous and highly volatile fission product (xenon, krypton, cesium, iodine, and tellurium) inventories in the fuel before accident initiation, release of the fission products from the fuel in to the reactor vessel during core melt, the probable chemical forms, and transport of the fission products from the core through the reactor vessel and existing piping to the confinement. In addition to a base-case analysis of fission product behavior, a series of analyses was performed to determine the sensitivity of fission product release to several parameters including steam flow rate, (structural) aluminum oxidation, and initial aerosol size. The base-case analyses indicate that the volatile fission products (excluding the noble gases) will be transported as condensed species on zinc aerosols. Approximately 40% of the initial inventories of volatile fission products will be deposited within either the reactor vessel or the intact piping in the confinement, and 60% of the inventory will be released into the open confinement during transient LCP15. For transient LPP9, approximately 15% of the initial inventories of cesium and iodine and 30% of the tellurium fission products are deposited within either the reactor vessel or the intact piping in the confinement, and the remaining inventory would be released into the open confinement. The different tellurium behavior within the reactor vessel during transient LPP9 was caused by chemical absorption of tellurium on the stainless steel structural surfaces. RP ADAMS, JP (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,FUELS & MAT UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 23 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD JUL PY 1993 VL 103 IS 1 BP 66 EP 78 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LJ045 UT WOS:A1993LJ04500006 ER PT J AU LARSEN, N OLSEN, GJ MAIDAK, BL MCCAUGHEY, MJ OVERBEEK, R MACKE, TJ MARSH, TL WOESE, CR AF LARSEN, N OLSEN, GJ MAIDAK, BL MCCAUGHEY, MJ OVERBEEK, R MACKE, TJ MARSH, TL WOESE, CR TI THE RIBOSOMAL DATABASE PROJECT SO NUCLEIC ACIDS RESEARCH LA English DT Article AB The Ribosomal Database Project (RDP) is a curated database that offers ribosome data along with related programs and services. The offerings include phylogenetically ordered alignments of ribosomal RNA (rRNA) sequences, derived phylogenetic trees, rRNA secondary structure diagrams and various software packages for handling, analyzing and displaying alignments and trees. The data are available via ftp and electronic mall. Certain analytic services are also provided by the electronic mail server. C1 UNIV ILLINOIS, DEPT MICROBIOL, 131 BURRILL HALL, 407 S GOODWIN AVE, URBANA, IL 61801 USA. ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 90237 USA. NR 8 TC 510 Z9 520 U1 3 U2 16 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUL 1 PY 1993 VL 21 IS 13 BP 3021 EP 3023 DI 10.1093/nar/21.13.3021 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LL722 UT WOS:A1993LL72200010 PM 8332524 ER PT J AU CHANG, SL LOTTES, SA AF CHANG, SL LOTTES, SA TI INTEGRAL COMBUSTION SIMULATION OF A TURBULENT REACTING FLOW IN A CHANNEL WITH CROSS-STREAM INJECTION SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID JET AB A new integral one-step reaction submodel has been developed for an Argonne combustion computer code to simulate reacting flows of an advanced combustor for magnetohydrodynamic power generation. The integral combustion code makes numerical calculations of a reacting flow more efficient and more stable while still preserving the major physical effects of the complex combustion processes. Results of the simulation indicate that (1) fluid mixing is mainly responsible for combustion performance and (2) counterflow injection with an injection angle in the range of 120-degrees to 140-degrees yields the best mixing and combustion performance. RP CHANG, SL (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 18 TC 11 Z9 11 U1 0 U2 0 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD JUL-AUG PY 1993 VL 24 IS 1 BP 25 EP 43 DI 10.1080/10407789308902601 PG 19 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA LN714 UT WOS:A1993LN71400002 ER PT J AU BURRELL, AK BRYAN, JC AF BURRELL, AK BRYAN, JC TI METHYL GRIGNARD REACTIONS WITH TC2(NAR)4(MU-NAR)2 - THE IMIDO LIGAND AS A LEAVING GROUP SO ORGANOMETALLICS LA English DT Note ID RAY CRYSTAL-STRUCTURES; MAIN-GROUP ELEMENTS; BUTYLIMIDO COMPOUNDS; TRANSITION-METALS; MULTIPLE BONDS; COMPLEXES AB The reaction of 2 equiv of MeMgCl with Tc2(NAr)4(mu-NAr)2 (Ar = 2,6-dimethylphenyl) results in displacement of an imido ligand and the formation of TcMe2(NAr)(mu-NAr)2Tc(NAr)2. Treatment of TcMe2(NAr)(mu-NAr)2Tc(NAr)2 with a further 2 equiv of MeMgCl again results in the substitution of an imido ligand and the formation of Tc2(NAr)2(mu-NAr)2Me4. Single crystal X-ray determinations of these complexes confirmed the unprecedented substitution of an imido ligand by two methyl groups. C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC 1,LOS ALAMOS,NM 87545. NR 14 TC 8 Z9 8 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUL PY 1993 VL 12 IS 7 BP 2426 EP 2428 DI 10.1021/om00031a010 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LU682 UT WOS:A1993LU68200010 ER PT J AU ALTEKAR, SD RAY, AK WIENKE, BR AF ALTEKAR, SD RAY, AK WIENKE, BR TI ON THE PARALLELIZATION OF A S(N) TRANSPORT ALGORITHM ON A CRAY Y-MP SO PARALLEL COMPUTING LA English DT Note DE S(N) TRANSPORT ALGORITHM; SHARED MEMORY MULTIPROCESSOR; CRAY Y-MP; SPEEDUP MEASUREMENTS; PERFORMANCE ANALYSIS ID ITERATION SCHEMES; EQUATION AB We have analyzed the parallel performance and speedup of a multigroup, discrete ordinates S(n) transport algorithm, on a CRAY Y-MP. Three types of iteration schemes varying from ordered to chaotic, have been compared using up to seven processors with five, seven and fourteen energy groups. Two types of convergence criteria have been investigated to evaluate the trade off between load-balancing and accuracy. C1 UNIV TEXAS, DEPT PHYS, ARLINGTON, TX 76019 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. NR 16 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 EI 1872-7336 J9 PARALLEL COMPUT JI Parallel Comput. PD JUL PY 1993 VL 19 IS 7 BP 823 EP 834 DI 10.1016/0167-8191(93)90067-U PG 12 WC Computer Science, Theory & Methods SC Computer Science GA LQ193 UT WOS:A1993LQ19300008 ER PT J AU GATLEY, SJ AF GATLEY, SJ TI DRUG STANDARDS FOR IODINE 123 RADIOPHARMACEUTICALS SO PHARMACOPEIAL FORUM LA English DT Article ID OXIDIZABLE SUBSTANCES TEST; TOTAL ORGANIC-CARBON; WATER RP GATLEY, SJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 26 TC 4 Z9 4 U1 0 U2 0 PU US PHARMACOPEIAL CONVENTION PI ROCKVILLE PA 12601 TWINBROOK PKWY, ROCKVILLE, MD 20852 SN 0363-4655 J9 PHARMACOPEIAL FORUM JI Pharmacop. Forum PD JUL-AUG PY 1993 VL 19 IS 4 BP 5850 EP 5854 PG 5 WC Medicine, Legal; Pharmacology & Pharmacy SC Legal Medicine; Pharmacology & Pharmacy GA MJ426 UT WOS:A1993MJ42600002 ER PT J AU STUMP, DM LAVIOLETTE, RA AF STUMP, DM LAVIOLETTE, RA TI EFFECTS OF SHEAR STRESSES ON CRACK-GROWTH MICROSTRUCTURES IN TRANSFORMATION-TOUGHENED CERAMICS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article AB In accordance with a prior study, transformation toughening of zirconia-reinforced ceramics is simulated by treating regions of particles surrounding quasistatically advancing cracks as Mode-I symmetric distributions of circular spots that undergo a 'supercritical' dilatant transformation when a critical stress criterion is satisfied. Three stress criteria are considered: mean stress, maximum in-plane shear stress, and an equal mixture of these two. Simulations with the mean-stress criterion show good agreement with results of previous continuum-based analyses, as the profile of the transformed region ahead of the tip approximates a partial cardioid. In contrast, simulations for the other criteria display claw-like transformed regions extending far ahead of the crack tip. This difference in behaviour is conjectured to arise from the presence of direct spot-to-spot interaction terms in the shear stress and may account for large (i.e. mm size) transformed regions seen in some materials. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. NR 6 TC 6 Z9 6 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD JUL PY 1993 VL 68 IS 1 BP 35 EP 47 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA LM120 UT WOS:A1993LM12000003 ER PT J AU ERIKSSON, O SODERLIND, P WILLS, JM BORING, AM AF ERIKSSON, O SODERLIND, P WILLS, JM BORING, AM TI 1ST PRINCIPLES STUDIES OF CRYSTAL-STRUCTURES OF F-ELEMENTS SO PHYSICA B LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON ACTINIDES UNDER PRESSURE CY OCT 12-13, 1992 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, DRUKKER INT ID HIGH-PRESSURE; CERIUM METAL; EXTREME COMPRESSIONS; ELECTRONIC-STRUCTURE; ACTINIDE METALS; BRILLOUIN-ZONE; SPECIAL POINTS; DELOCALIZATION; TRANSITION; AMERICIUM AB The crystal structures of some selected f band metals (Ce, Th, Pa, U and Am) have been calculated from first principles. It is demonstrated that the onset of low symmetry structures correlates with the increasing f occupation of the valence states. It is also shown that pressure is an important parameter for these types of studies, and that the occupation of the various orbitals of the valence band depends on it. One can thus modify (increase) the f occupation of a certain system, simply by applying a pressure. Since the crystal structure depends on the f occupation, for these systems, one can drive different crystal structures as function of pressure. We present one such example, the FCC --> BCT phase transition at approximately 1 Mbar for Th. C1 LOS ALAMOS NATL LAB,CTR MED,LOS ALAMOS,NM 87544. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87544. RP ERIKSSON, O (reprint author), UNIV UPPSALA,DEPT PHYS,S-75105 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 29 TC 11 Z9 11 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL PY 1993 VL 190 IS 1 BP 5 EP 11 DI 10.1016/0921-4526(93)90436-A PG 7 WC Physics, Condensed Matter SC Physics GA LN219 UT WOS:A1993LN21900003 ER PT J AU THOMPSON, JD AF THOMPSON, JD TI PRESSURE STUDIES OF 4F AND 5F INTERMETALLICS WITH STRONG ELECTRONIC CORRELATIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON ACTINIDES UNDER PRESSURE CY OCT 12-13, 1992 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, DRUKKER INT ID ENERGY-GAP; TEMPERATURE; RESISTIVITY; BEHAVIOR; SMB6 AB The pressure response of strongly correlated 4f and 5f intermetallic compounds is reviewed briefly. Special attention is given to the similarities and differences among isostructural U-, Ce- and Yb-based analogues. In general, pressure favors reduced electronic correlations in U- and Ce-based materials, whereas the opposite holds for Yb-based systems. A simple model is discussed that qualitatively accounts for these observations. RP THOMPSON, JD (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 41 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL PY 1993 VL 190 IS 1 BP 61 EP 67 DI 10.1016/0921-4526(93)90443-A PG 7 WC Physics, Condensed Matter SC Physics GA LN219 UT WOS:A1993LN21900010 ER PT J AU GENSINI, M HAIRE, RG BENEDICT, U HULLIGER, F AF GENSINI, M HAIRE, RG BENEDICT, U HULLIGER, F TI HIGH-PRESSURE BEHAVIOR OF CMBI AND UBI SO PHYSICA B LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON ACTINIDES UNDER PRESSURE CY OCT 12-13, 1992 CL KARLSRUHE, GERMANY SP COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, DRUKKER INT ID UNIVERSAL FEATURES; MONOCHALCOGENIDES; METALS AB We report here high-pressure X-ray diffraction studies of the two actinide compounds, UBi and CmBi. These compounds existed initially in the NaCl-type (B1) crystal structure and each was studied at room temperature using a diamond anvil cell and energy dispersive X-ray diffraction analysis. The U and Cm monobismuthides were studied up to pressures of 42 and 48 GPa, respectively. All materials exhibited first-order crystallographic phase transitions from their NaCl-type (B1) to a CsCl-type (B2) structure, which were accompanied by volume collapses: UBi at 5 GPa (11% volume change); CmBi at 12 GPa (16% volume change). With curium monobismuthide a subsequent second-order transition from the CsCl-type structure to a tetragonal phase (indexed in space group P4 / mmm) occurred at 19 GPa. The bulk moduli and their pressure derivatives were derived for each material from the experimental pressure-volume relationships for the B1 phases. These values were: for UBi, 91 GPa and - 5.4; for CmBi, 53 GPa and 8.1. C1 COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,POB 2340,D-76125 KARLSRUHE,GERMANY. OAK RIDGE NATL LAB,TRANSURANIUM RES LAB,OAK RIDGE,TN. SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8092 ZURICH,SWITZERLAND. NR 33 TC 17 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL PY 1993 VL 190 IS 1 BP 75 EP 83 DI 10.1016/0921-4526(93)90446-D PG 9 WC Physics, Condensed Matter SC Physics GA LN219 UT WOS:A1993LN21900013 ER PT J AU FOURNIER, JM HAIRE, RG JOHANSSON, B KALVIUS, GM WACHTER, P AF FOURNIER, JM HAIRE, RG JOHANSSON, B KALVIUS, GM WACHTER, P TI ACTINIDES UNDER PRESSURE - 4TH WORKSHOP ON ACTINIDES UNDER PRESSURE ORGANIZED BY THE EUROPEAN INSTITUTE FOR TRANSURANIUM ELEMENTS KARLSRUHE, GERMANY, 12-13 OCTOBER 1992 - SUMMARY AND CONCLUSIONS SO PHYSICA B LA English DT Editorial Material C1 OAK RIDGE NATL LAB,TRANSURANIUM RES LAB,OAK RIDGE,TN. UNIV UPPSALA,DEPT PHYS,S-75121 UPPSALA,SWEDEN. TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND. RP FOURNIER, JM (reprint author), UNIV JOSEPH FOURIER,POB 53X,GRENOBLE,FRANCE. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JUL PY 1993 VL 190 IS 1 BP R9 EP R10 PG 2 WC Physics, Condensed Matter SC Physics GA LN219 UT WOS:A1993LN21900018 ER PT J AU DORRIS, SE PROROK, BC LANAGAN, MT SINHA, S POEPPEL, RB AF DORRIS, SE PROROK, BC LANAGAN, MT SINHA, S POEPPEL, RB TI SYNTHESIS OF HIGHLY PURE BISMUTH-2223 BY A 2-POWDER PROCESS SO PHYSICA C LA English DT Article ID PHASE; SYSTEM AB Use of a so-called two-powder process results in rapid formation of a highly pure superconducting bismuth-2223 phase during powder-in-tube processing. In this process, SrxCa1-xCuO2 and Bi1.8Pb0.4Sr2-xCa1+xCu2O8 are formed as separate intermediate phases, and mixed, then processed together within a silver sheath. Mixtures with x values of 0.0, 0.25, 0.50, 0.75, and 1.0 are studied in order to probe the relationship between 2223 formation and the melting behavior of 2212. The best results to date have been obtained with the x=0.0 mixture containing high-melting, strontium-rich 2212 and calcium cuprate. The process is very reproducible and produces nearly pure 2223 in as little as 50 h. C1 UNIV ILLINOIS,DEPT CIVIL ENGN MECH & MET,CHICAGO,IL 60680. RP DORRIS, SE (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. RI Prorok, Barton/A-7404-2010 NR 14 TC 145 Z9 146 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1993 VL 212 IS 1-2 BP 66 EP 74 DI 10.1016/0921-4534(93)90486-A PG 9 WC Physics, Applied SC Physics GA LL339 UT WOS:A1993LL33900009 ER PT J AU BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ NORTON, DP LOWNDES, DH AF BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ NORTON, DP LOWNDES, DH TI CORRELATION BETWEEN HOLE DEPLETION AND ATOMIC-STRUCTURE AT HIGH-ANGLE GRAIN-BOUNDARIES IN YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; CRITICAL CURRENTS; CRYSTALS AB Using a combination of high-resolution Z-contrast imaging and high-resolution electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM), the local hole depletion and local atomic structure in the region of grain boundaries can be studied simultaneously. The atomic resolution Z-contrast image can be used to position the probe for energy loss spectroscopy, which by quantitative analysis of the pre-edge feature of the oxygen K-absorption edge can be used to measure the local hole depletion to an accuracy of approximately 5%. Additionally, as the Z-contrast technique is sensitive to the effects of damage from the specimen preparation, boundaries representative of the original material can be easily selected. Studies have been performed on both asymmetric and symmetric high-angle tilt boundaries in YBa2Cu3O7-delta films prepared by laser ablation on yttria-stabilised-zirconia (YSZ) substrates. The symmetric boundary shows no significant hole depletion in the boundary region whereas the asymmetric boundary has significant depletion in a zone extending over a far greater region than the disordered atomic structure indicated by the image. RP BROWNING, ND (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. OI Browning, Nigel/0000-0003-0491-251X NR 15 TC 77 Z9 77 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1993 VL 212 IS 1-2 BP 185 EP 190 DI 10.1016/0921-4534(93)90501-G PG 6 WC Physics, Applied SC Physics GA LL339 UT WOS:A1993LL33900024 ER PT J AU CHEN, ZY SHENG, ZZ TANG, YQ LI, YF PEDERSON, DO GORETTA, K KOSTIC, P SHI, DL AF CHEN, ZY SHENG, ZZ TANG, YQ LI, YF PEDERSON, DO GORETTA, K KOSTIC, P SHI, DL TI EFFECTS OF BI-SUBSTITUTION FOR TL IN 1222-TYPE CUPRATE TLSR2(ND, CE)2CU2OZ SO PHYSICA C LA English DT Article AB Bi may substitute Tl in the 1222-type cuprate TlSr2(Nd0.75Ce0.25)2Cu2O2Oz up to 80%. The Tl-free Bi-1222 cuprate does not form even from a Bi-1222 starting composition. The c-axis and cell volume of the (Tl, Bi)-1222 cuprate decrease with the increase of the amount of Bi. Resistance measurements showed that Bi substitution for Tl converts superconducting TlSr2(Nd0.15Ce0.25)2Cu2Oz to semiconducting (Tl1-xBix)Sr2(Nd0.75Ce0.25)2Cu2Oz (x greater-than-or-equal-to 0.2). These results are discussed according to the concept of mixed Cu valence. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CHEN, ZY (reprint author), UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701, USA. NR 13 TC 3 Z9 3 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1993 VL 212 IS 1-2 BP 206 EP 210 DI 10.1016/0921-4534(93)90504-J PG 5 WC Physics, Applied SC Physics GA LL339 UT WOS:A1993LL33900027 ER PT J AU AU, HL ASOKAKUMAR, P BELING, CD FUNG, S LYNN, KG AF AU, HL ASOKAKUMAR, P BELING, CD FUNG, S LYNN, KG TI FREQUENCY-DEPENDENCE OF POSITRON-ANNIHILATION SIGNAL FROM MOS STRUCTURE SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Note ID INTERFACE C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP AU, HL (reprint author), UNIV HONG KONG,DEPT PHYS,HONG KONG,HONG KONG. NR 8 TC 7 Z9 7 U1 0 U2 0 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD JUL PY 1993 VL 178 IS 1 BP K11 EP K15 DI 10.1002/pssb.2221780127 PG 5 WC Physics, Condensed Matter SC Physics GA LP404 UT WOS:A1993LP40400026 ER PT J AU YOUNG, L KURTZ, CA BECK, DR DATTA, D AF YOUNG, L KURTZ, CA BECK, DR DATTA, D TI HYPERFINE-STRUCTURE STUDIES OF ZR-II - EXPERIMENTAL AND RELATIVISTIC CONFIGURATION-INTERACTION RESULTS SO PHYSICAL REVIEW A LA English DT Article ID CONSISTENT-FIELD CALCULATIONS; DOUBLE-RESONANCE SPECTROSCOPY; MANY-BODY CALCULATIONS; METAL ATOMS; SC-II; ENERGIES; DIPOLE; STATES AB We report an experimental and theoretical study of the hyperfine structure (hfs) in various metastable levels in Zr-91 II. Hyperfine structures in 11 levels arising from the 4d3 and 4d(2)5S Configurations were measured using the laser-rf double-resonance method in a collinear laser-ion-beam geometry. The hfs A and B constants were measured to a precision of 4 and 11 kHz, respectively. Less precise values for hfs constants for nine upper levels in the 4d(2)5p configuration were derived from optical spectra. Theoretically, the A and B constants for the metastable levels having J = 0.5 and 1.5 were calculated using a relativistic configuration-interaction (RCI) approach. The final many-body wave function produced energy gaps between the five J = 0.5 levels which differ from experiment by an average of 0.050 eV, whereas the corresponding value for the ten J = 1.5 levels is 0.087 eV. For the two J = 0.5 levels measured and calculated, the average error in A is 31.8 %. For the three J = 1. 5 levels, the situation is better, with the average error in A being 9.2%. For comparison, the average errors in A using independent-particle Dirac-Fock (DF) wave functions were 88% and 136% for J =0.5 and 1.5, respectively. In all cases, the many-body (RCI) result represents a vast improvement from the DF result for the A values. The value for the electric-quadrupole moment of Zr-91 obtained from a comparison of the experimental B values and theoretical matrix elements is 0.257(0.013) b. In addition, the calculations confirm a previous report that the level at 17614.00 cm-1 reported in Moore's Atomic Energy Levels, Vol. II (U.S. Government Printing Office, Washington, D.C., 1971) is spurious. C1 MICHIGAN TECHNOL UNIV,DEPT PHYS,HOUGHTON,MI 49931. RP YOUNG, L (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Kurtz, Chalres/G-1037-2011 OI Kurtz, Chalres/0000-0003-2606-0864 NR 41 TC 14 Z9 14 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1993 VL 48 IS 1 BP 173 EP 181 DI 10.1103/PhysRevA.48.173 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LM341 UT WOS:A1993LM34100032 ER PT J AU RICHARDS, JD BREINIG, M GAITHER, CC BERRYMAN, JW HASSON, BF AF RICHARDS, JD BREINIG, M GAITHER, CC BERRYMAN, JW HASSON, BF TI DETECTION OF 2 ELECTRONS IN LOW-LYING CONTINUUM STATES OF A SINGLE PROJECTILE ION RESULTING FROM THE COLLISION OF A 10.7-MEV AG(4+) ION WITH AN AR GAS ATOM SO PHYSICAL REVIEW A LA English DT Article ID THRESHOLD; IONIZATION AB Two electrons, excited just above the double-ionization threshold of an Ag(q+) (q = 5,6) core in a single collision of a 0.1-MeV/u Ag4+ projectile ion with an Ar atom, are detected. The electron detector consists of electrically isolated anode segments located behind a microchannel-plate electron multiplier. A large electrostatic 30-degrees parallel-plate analyzer is used to deflect the two free electrons, which move with approximately the projectile velocity, into the detector. The cross sections for producing final states consisting of a positively charged ionic core and two electrons just above the threshold for double ionization in ion-atom collisions have been measured. The cross sections for producing states with one electron moving with a kinetic energy less than 0.13 eV in the projectile frame and the other moving with somewhat higher kinetic energy are presented. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP RICHARDS, JD (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1993 VL 48 IS 1 BP 414 EP 418 DI 10.1103/PhysRevA.48.414 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LM341 UT WOS:A1993LM34100059 ER PT J AU HALKA, M HARRIS, PG MOHAGHEGHI, AH REEDER, RA TANG, CY BRYANT, HC DONAHUE, JB QUICK, CR AF HALKA, M HARRIS, PG MOHAGHEGHI, AH REEDER, RA TANG, CY BRYANT, HC DONAHUE, JB QUICK, CR TI ELECTRIC-FIELD EFFECTS ON H- PHOTODETACHMENT PARTIAL CROSS-SECTIONS ABOVE 13.4 EV SO PHYSICAL REVIEW A LA English DT Article ID RESONANCE AB When static electric fields (F less-than-or-equal-to 90 kV/cm) were applied to the H- photodetachment interaction region, new structure and lowered thresholds for production of neutral hydrogen were observed. Relative partial cross sections were measured by detection of excited states of the fragment neutral hydrogen atom H(N = 4, 5, or 6) resulting from laser interaction with relativistic H- ions. Downward shifts in the onset of excited hydrogen production are observed to increase with field strength, and agree with a recent hyperspherical coordinate interpretation of Zhou and Lin [Phys. Rev. Lett. 69, 3294 (1992)]. Field-induced window-type resonance structure is observed both below and above the zero-field threshold (ZFT) energy. Quenching of high-lying autoionizing states was also monitored, providing evidence of field-induced tunneling by resonances lying just below the associated ZFT. C1 UNIV NEW MEXICO, DEPT PHYS & ASTRON, ALBUQUERQUE, NM 87131 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 26 TC 15 Z9 15 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1993 VL 48 IS 1 BP 419 EP 426 DI 10.1103/PhysRevA.48.419 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LM341 UT WOS:A1993LM34100060 ER PT J AU KNIGHT, PL SHORE, BW AF KNIGHT, PL SHORE, BW TI SCHRODINGER-CAT STATES OF THE ELECTROMAGNETIC-FIELD AND MULTILEVEL ATOMS SO PHYSICAL REVIEW A LA English DT Article ID JAYNES-CUMMINGS MODEL; SIMPLE QUANTUM MODEL; CAVITY FIELDS; 3-LEVEL ATOM; COLLAPSE; REVIVAL; MICROMASER; APPARATUS; RESONANCE; DYNAMICS AB We demonstrate that the generalization of the two-level Jaynes-Cummings model to an N-level atom leads to the creation of up to N macroscopically distinct field states. These field states are Schmidt-orthogonalized superpositions of Fock states. They correspond to macroscopic states of the field, attainable with large mean photon numbers. Unlike the situation with a two-level atom and a coherent-state field, which evolves into a macroscopic coherent superposition state (a Schrodinger cat), we find that when the additional levels participate strongly in the excitation (e.g., all transitions are resonant with equal dipole moments) then the system does not evolve into a pure state. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KNIGHT, PL (reprint author), UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. NR 50 TC 73 Z9 73 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1993 VL 48 IS 1 BP 642 EP 655 DI 10.1103/PhysRevA.48.642 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LM341 UT WOS:A1993LM34100085 ER PT J AU LAGATTUTA, KJ AF LAGATTUTA, KJ TI RADIATION EMITTED BY A RESONANTLY DRIVEN HYDROGEN-ATOM SO PHYSICAL REVIEW A LA English DT Article ID HARMONIC-GENERATION; MULTIPHOTON IONIZATION; LASER FIELD; SCATTERING; FLUORESCENCE; INTENSE; RATES; TIME AB The spectrum of scattered radiation was computed for an electron, bound initially in the 2s state of a hydrogen atom and driven resonantly by the sinusoidal field of a moderately intense (approximately 10(13) W/cm2) linearly polarized laser. A numerical solution of the time-dependent Schrodinger equation was performed for the duration of a 20-30-fs laser pulse. The radiation which emerges from this transient state was characterized by the autocorrelation function of the electronic acceleration defined as C(a)(t)=integral-infinity/-infinity dt'[1s\a(t').a(t'-t)\1s], as previously described [K. LaGattuta, J. Mod. Opt. 39, 1181 (1992)]. Then the energy spectrum of the radiation was determined from S(OMEGA) =(alpha3/3pi)integral-infinity/-infinity dt e(iOMEGAt)C(a)(t). Copious radiation, near the second harmonic, was emitted from this metastable excited state, prior to ionization. RP LAGATTUTA, KJ (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 21 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1993 VL 48 IS 1 BP 666 EP 670 DI 10.1103/PhysRevA.48.666 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LM341 UT WOS:A1993LM34100087 ER PT J AU DEVANATHAN, R LAM, NQ OKAMOTO, PR MESHII, M AF DEVANATHAN, R LAM, NQ OKAMOTO, PR MESHII, M TI MOLECULAR-DYNAMICS SIMULATION OF ELECTRON-IRRADIATION-INDUCED AMORPHIZATION OF NIZR2 SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM METHOD; INTERMETALLIC COMPOUNDS; ELASTIC-CONSTANTS; AMORPHOUS TRANSITION; BRILLOUIN-SCATTERING; CRYSTALLINE; ALLOYS; DISORDER; METALS; SYSTEM AB We have used molecular-dynamics simulations to examine electron-irradiation-induced amorphization of the ordered intermetallic compound NiZr2. The principal effects of irradiation by MeV electrons, namely chemical disorder and Frenkel-pair generation, were simulated in two separate processes: Chemical disorder was created by exchanging randomly selected Ni and Zr atoms, and Frenkel pairs were introduced by removing atoms at random from their sites and introducing them into interstitial positions. The interactions between the atoms were governed by embedded-atom potentials. During the simulation, the potential energy, volume, radial distribution function, elastic constants, and mean-square atomic displacement were calculated as functions of damage dose. In addition, the structure of the system was characterized by diffraction patterns obtained with the use of the multislice method in conjunction with the simulation. Our results indicate that both random atom exchanges and Frenkel-pair introduction can amorphize NiZr2. At the critical dose of about 0.16 dpa (displacements per atom), the energy and volume attained values corresponding to the quenched liquid and the system became elastically isotropic. Moreover, the variation of the average shear elastic constant with mean-square atomic displacement, following isothermal disorder and isobaric heating, provides evidence in favor of a unified description of amorphization and melting. The results obtained in the present work are in agreement with experimental observations. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP DEVANATHAN, R (reprint author), ARGONNE NATL LAB,DIV MAT SCI,BLDG 212-C224,ARGONNE,IL 60439, USA. RI Devanathan, Ram/C-7247-2008 OI Devanathan, Ram/0000-0001-8125-4237 NR 46 TC 51 Z9 51 U1 2 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 42 EP 51 DI 10.1103/PhysRevB.48.42 PG 10 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700006 ER PT J AU EASTMAN, JA THOMPSON, LJ KESTEL, BJ AF EASTMAN, JA THOMPSON, LJ KESTEL, BJ TI NARROWING OF THE PALLADIUM-HYDROGEN MISCIBILITY GAP IN NANOCRYSTALLINE PALLADIUM SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-DIFFRACTION; THERMODYNAMIC PROPERTIES; GRAIN-BOUNDARIES; LATTICE-DEFECTS; SOLUBILITY; ABSORPTION; PARTICLES; METALS; ALLOYS; STATE AB In situ x-ray-diffraction studies of the hydriding behavior of coarse-grained and nanocrystalline palladium samples at ambient temperature are described. A previously observed narrowing of the miscibility gap in nanocrystalline palladium was reproduced. The present results, however, demonstrate that this change in the palladium-hydrogen phase diagram for nanocrystalline material is not related to an inability to form the hydride phase in highly disordered grain boundary regions as previously proposed. Instead, the entire volume of nanocrystalline samples was observed to transform to beta-PdH upon exposure to hydrogen. This behavior indicates that the entropy and/or enthalpy of mixing for the palladium-hydrogen system differs in nanocrystalline and coarse-grained materials. Because of these changes in thermodynamic quantities, the phase boundary of the palladium-hydrogen miscibility gap is predicted to be shifted to lower temperatures for nanocrystalline samples. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RI Eastman, Jeffrey/E-4380-2011; OI Eastman, Jeff/0000-0002-0847-4265 NR 34 TC 151 Z9 151 U1 2 U2 27 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 84 EP 92 DI 10.1103/PhysRevB.48.84 PG 9 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700013 ER PT J AU COFFEY, MW CLEM, JR AF COFFEY, MW CLEM, JR TI THEORY OF MICROWAVE TRANSMISSION AND REFLECTION IN TYPE-II SUPERCONDUCTORS IN THE MIXED-STATE SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; VORTEX-GLASS SUPERCONDUCTIVITY; MAGNETIC-FIELD DEPENDENCE; RF SURFACE IMPEDANCE; BA-CU-O; FLUX CREEP; THIN-FILMS; YBA2CU3O7-X; TRANSPORT; CRYSTAL AB We develop a phenomenological theory for microwave transmission and reflection in type-II superconducting films that self-consistently includes the effects of vortices. The theory includes the effects of vortex inertia, pinning, flux flow, and flux creep in a unified manner by using a complex dynamic vortex mobility. The treatment of vortex dynamics in the linear-response regime includes nonlocal vortex interactions in addition to two-fluid effects. Our results, including the complex effective wave number, rf conductivity, and transmission and reflection coefficients, are expected to be valid over a wide range of magnetic induction, frequency, and temperature. Numerical results illustrate the temperature and field dependences of these quantities for typical experimental conditions. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP COFFEY, MW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 45 TC 50 Z9 50 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 342 EP 350 DI 10.1103/PhysRevB.48.342 PG 9 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700043 ER PT J AU KOGAN, VG SIMONOV, AY LEDVIJ, M AF KOGAN, VG SIMONOV, AY LEDVIJ, M TI MAGNETIC-FIELD OF VORTICES CROSSING A SUPERCONDUCTOR SURFACE SO PHYSICAL REVIEW B LA English DT Article ID UNIAXIAL SUPERCONDUCTORS; LATTICE AB The field distribution of a straight London vortex crossing the flat boundary of a uniaxial superconductor is evaluated. A superconducting half-space and a thin film are considered for a general crystal and vortex orientation relative to the surface. Vortex lattices in a film with a tilted crystal axis are distorted more strongly than in the bulk. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOGAN, VG (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. RI Simonov, Andrei/C-1697-2015 OI Simonov, Andrei/0000-0001-6452-0214 NR 22 TC 31 Z9 31 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 392 EP 397 DI 10.1103/PhysRevB.48.392 PG 6 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700048 ER PT J AU CRESPI, VH COHEN, ML AF CRESPI, VH COHEN, ML TI ANHARMONIC PHONONS AND HIGH-TEMPERATURE SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; PAIR BREAKING; CU-O; YBA2CU3O7; PR; TRANSITION; LA2-XSRXCUO4; RESISTIVITY; ABSENCE; CRYSTAL AB We examine a simple model of anharmonic phonons with application to the superconducting isotope effect. Linear and quadratic electron-phonon coupling are considered for various model potentials. The results of the model calculations are compared with the high-temperature superconductors La2-xSrxCuO4, Y1-xPrxBa2Cu3O7-delta, and YBa2Cu3-xMxO7-delta with M = Zn, Ni, or Fe. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CRESPI, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 63 TC 35 Z9 35 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 398 EP 406 DI 10.1103/PhysRevB.48.398 PG 9 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700049 ER PT J AU SUMARLIN, IW LYNN, JW NEUMANN, DA RUSH, JJ LOONG, CK PENG, JL LI, ZY AF SUMARLIN, IW LYNN, JW NEUMANN, DA RUSH, JJ LOONG, CK PENG, JL LI, ZY TI PHONON DENSITY-OF-STATES IN R2CUO4 AND SUPERCONDUCTING R1.85CE0.15CUO4(R = ND,PR) SO PHYSICAL REVIEW B LA English DT Article ID INELASTIC-NEUTRON-SCATTERING; CRYSTAL-FIELD; RARE-EARTH; BA1-XKXBIO3; ND2CUO4; PR2CUO4 AB Inelastic-neutron-scattering measurements of the generalized phonon density of states (GDOS) for the electron-doped superconductors Nd1.85Ce0.15CuO4 and Pr1.85Ce0.15CuO4 have been carried out with the use of both a filter-detector method and time-of-flight spectroscopy. A measurement of the GDOS for the insulating Pr2CuO4 was also done for comparison with that of Pr1.85Ce0.15CuO4, while a more limited set of data was obtained for Nd2CuO4. Comparison between the GDOS spectrum of the Nd1.85Ce0.15CuO4 with that of Pr1.85Ce0.15CuO4 shows differences in the shape of some structures in the GDOS spectrum. Furthermore, there are substantial changes in the GDOS spectrum of Pr1.85Ce0.15CuO4 as compared to that of Pr2CuO4, particularly in the energy regime between 33 and 63 meV. In the Nd1.85Ce0.15CuO4 system, where electron-tunneling measurements have been performed, there are similarities between the GDOS spectrum and the Eliashberg-coupling function alpha2F(omega) obtained from the tunneling data in the energy regions where comparisons can be made. To the extent that this comparison is valid, it suggests that phonons are to some extent involved in the electron-pairing mechanism in these electron-doped superconductor systems. We have also determined the ground-state crystal-field excitations associated with the rare-earth ions (Nd3+, Pr3+). The Nd3+ crystal-field levels are observed at energies of 13, 20.7, 26.4, and 93 meV in superconducting Nd1.85Ce0.15CuO4. For the Pr2CuO4 system, the Pr3+ crystal-field excitations are found at 18.6 and 87.9 meV. These peaks broaden and split when doped to form superconducting Pr1.85Ce0.15CuO4. The observed crystal-field levels in the above systems are in good agreement with those reported by other groups. C1 NATL INST STAND & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. RP SUMARLIN, IW (reprint author), UNIV MARYLAND,CTR SUPERCONDUCT RES,DEPT PHYS,COLL PK,MD 20742, USA. NR 40 TC 16 Z9 16 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 473 EP 482 DI 10.1103/PhysRevB.48.473 PG 10 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700056 ER PT J AU RADAELLI, PG JORGENSEN, JD SCHULTZ, AJ HUNTER, BA WAGNER, JL CHOU, FC JOHNSTON, DC AF RADAELLI, PG JORGENSEN, JD SCHULTZ, AJ HUNTER, BA WAGNER, JL CHOU, FC JOHNSTON, DC TI STRUCTURE OF THE SUPERCONDUCTING LA2CUO4+DELTA PHASES (DELTA-APPROXIMATE-TO-0.08,0.12) PREPARED BY ELECTROCHEMICAL OXIDATION SO PHYSICAL REVIEW B LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; OXYGEN; SUPEROXIDE; IDENTIFICATION; LA2NIO4+DELTA; LA2CUO4.032; DIFFRACTION; SEPARATION; REFINEMENT; LATTICE AB Two powder samples of electrochemically oxidized La2CuO4+delta (nominally delta almost-equal-to 0.08 and 0.12) and one single crystal (delta almost-equal-to 0.1), with superconducting critical temperatures of 32, 42, and 40 K, respectively, were studied using neutron diffraction. All samples appear to be single phase, both at room temperature and at low temperature (10-18 K), as evidenced by sharp Bragg peaks, indicating that these samples have compositions beyond the phase-separated region of the phase diagram. A detailed analysis of the Bragg reflections demonstrated that the basic crystallographic structure of all samples has Fmmm symmetry, with the excess oxygen located between adjacent LaO layers. However, a number of low-intensity peaks in the powder data suggested the existence of a very large superstructure. The satellites could be clearly identified in the single-crystal data, allowing the propagation vectors of the modulation to be determined. Rietveld refinements of the average structure, based on the main Bragg peaks, are presented here for samples prepared with this technique. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP RADAELLI, PG (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 39 TC 150 Z9 150 U1 5 U2 18 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 499 EP 510 DI 10.1103/PhysRevB.48.499 PG 12 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700059 ER PT J AU MOSLEY, WD DYKES, JW KLAVINS, P SHELTON, RN STERNE, PA HOWELL, RH AF MOSLEY, WD DYKES, JW KLAVINS, P SHELTON, RN STERNE, PA HOWELL, RH TI CORRELATION OF THE SUPERCONDUCTING TRANSITION TO OXYGEN STOICHIOMETRY IN SINGLE-CRYSTAL BA1-XKXBIO3-Y SO PHYSICAL REVIEW B LA English DT Note ID SYSTEM AB Temperature-dependent positron-lifetime experiments have been performed from room temperature to 15 K on single crystals of the oxide superconductor Ba1-xKxBiO3-y. Results indicate that the filling of oxygen vacancies has a marked impact on the superconducting properties of this system. Cation defect concentrations were below the detectable limit of positron-annihilation-analysis techniques in this material, which is in sharp contrast to identical studies on polycrystalline samples. We find that the positron lifetime in these electrochemically deposited single crystals is determined by the oxygen stoichiometry of the lattice, but there is no experimental signature of strong positron localization. By performing a subsequent oxygen anneal on the crystals, the superconducting transition is sharpened and the onset is raised. The observed change in positron lifetime associated with this annealing procedure is in quantitative agreement with theory. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MOSLEY, WD (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 15 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 611 EP 614 DI 10.1103/PhysRevB.48.611 PG 4 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700080 ER PT J AU ALEXANDER, FJ CHEN, S GRUNAU, DW AF ALEXANDER, FJ CHEN, S GRUNAU, DW TI HYDRODYNAMIC SPINODAL DECOMPOSITION - GROWTH-KINETICS AND SCALING FUNCTIONS SO PHYSICAL REVIEW B LA English DT Note ID 2-DIMENSIONAL FLUID MODEL; LATTICE-GAS; RENORMALIZATION-GROUP; DYNAMICS; LIMIT AB We examine the effects of hydrodynamics on the late-stage kinetics in spinodal decomposition. From computer simulations of a lattice Boltzmann scheme we observe, for critical quenches, that single-phase domains grow asymptotically like t(alpha), with alpha almost-equal-to 0.66 in two dimensions and alpha almost-equal-to 1.0 in three dimensions, both in excellent agreement with theoretical predictions. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP ALEXANDER, FJ (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. RI Chen, Shiyi/A-3234-2010 NR 32 TC 91 Z9 91 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 634 EP 637 DI 10.1103/PhysRevB.48.634 PG 4 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700087 ER PT J AU RADTKE, RJ LEVIN, K SCHUTTLER, HB NORMAN, MR AF RADTKE, RJ LEVIN, K SCHUTTLER, HB NORMAN, MR TI PREDICTIONS FOR IMPURITY-INDUCED TC SUPPRESSION IN THE HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID PAIR-BREAKING; HUBBARD-MODEL; YBA2CU3O7-DELTA AB We address the question of whether anisotropic superconductivity is compatible with the evidently weak sensitivity of the critical temperature T(c) to sample quality in the high-T(c) copper oxides. We examine this issue quantitatively by solving the strong-coupling Eliashberg equations numerically as well as analytically for s-wave impurity scattering within the second Born approximation. For pairing interactions with a characteristically low energy scale, we find an approximately universal dependence of the d-wave superconducting transition temperature on the planar residual resistivity which is independent of the details of the microscopic pairing. These results, in conjunction with future systematic experiments, should help elucidate the symmetry of the order parameter in the cuprates. C1 UNIV CHICAGO, JAMES FRANCK INST, CHICAGO, IL 60637 USA. UNIV GEORGIA, DEPT PHYS & ASTRON, ATHENS, GA 30602 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP UNIV CHICAGO, DEPT PHYS, CHICAGO, IL 60637 USA. RI Norman, Michael/C-3644-2013 NR 38 TC 152 Z9 152 U1 1 U2 8 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 1 BP 653 EP 656 DI 10.1103/PhysRevB.48.653 PG 4 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700092 ER PT J AU WOLVERTON, C CEDER, G DEFONTAINE, D DREYSSE, H AF WOLVERTON, C CEDER, G DEFONTAINE, D DREYSSE, H TI AB-INITIO DETERMINATION OF STRUCTURAL STABILITY IN FCC-BASED TRANSITION-METAL ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE STRUCTURES; EFFECTIVE CLUSTER INTERACTIONS; EFFECTIVE-PAIR INTERACTIONS; CENTERED-CUBIC LATTICE; ORDERED BINARY-ALLOYS; TIGHT-BINDING THEORY; ISING-MODEL; NEIGHBOR INTERACTIONS; 2ND-NEIGHBOR INTERACTIONS; INTERMETALLIC COMPOUNDS AB A cluster expansion is used to determine the energy of substitutionally disordered alloys as a function of configuration. The expansion is exact in the sense that the basis functions are complete and orthonormal. The coefficients, effective cluster interactions (ECI's), are computed directly from their definition by means of the method of direct configurational averaging, which is described in detail in the context of a tight-binding linear muffin-tin orbital (TB-LMTO) Hamiltonian. The alloy Hamiltonian is constructed from a combination of the pure-element TB-LMTO Hamiltonians, the hopping integrals between unlike pairs of atoms (simply given by the geometric mean of the pure-element integrals), and the potentials of the alloy, which are computed consistent with the condition that each configurationally averaged atom of the alloy be neutral. This scheme of self-consistency is tested against the results of fully self-consistent LMTO calculations on ordered compounds. The ECI's are computed on the fcc lattice for six alloy systems: Rh-Ti, Rh-V, Pd-Ti, Pd-V, Pt-Ti, and Pt-V. It is shown how the ECI's may be used in conjunction with properties of the energy expansion to exactly solve for the ground-state superstructures of fcc. This ground-state search is contingent upon minimizing the configurational energy subject to a number of geometric constraints. A large number of these constraints are formulated using group-theoretic means on the (13-14)-point clusters of the fcc lattice. The use of this large number of constraints makes possible the inclusion of fourth-nearest-neighbor pair ECI's as well as multiplet ECI's in the ground-state search. Both these types of interactions are shown to be essential towards obtaining a convergent energy expansion. In all six alloy systems, agreement between the theoretically predicted ground states and the experimental evidence of fcc superstructures is excellent: in no case is an unambiguously experimentally determined fcc-based phase missing from the results of the ground-state search. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. MIT, DEPT MAT SCI, CAMBRIDGE, MA 02139 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. UNIV NANCY, PHYS SOLIDE LAB, VANDOEUVRE LES NANCY, FRANCE. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Wolverton, Christopher/B-7542-2009 NR 85 TC 54 Z9 54 U1 0 U2 10 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 726 EP 747 DI 10.1103/PhysRevB.48.726 PG 22 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500007 ER PT J AU ASTA, M MCCORMACK, R DEFONTAINE, D AF ASTA, M MCCORMACK, R DEFONTAINE, D TI THEORETICAL-STUDY OF ALLOY PHASE-STABILITY IN THE CD-MG SYSTEM SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE STRUCTURES; BINARY HCP ALLOYS; EFFECTIVE CLUSTER INTERACTIONS; TRANSITION-METALS; ISING-MODEL; 1ST-PRINCIPLES CALCULATION; NEIGHBOR INTERACTIONS; ABINITIO CALCULATION; PHONON DISPERSIONS; ELASTIC-CONSTANTS AB A theoretical study of thermodynamic properties and of the phase diagram for crystalline hcp-based Cd-Mg alloys is presented. Many first-principles studies of phase diagrams for metallic alloys have considered only configurational contributions to the free energy, which arise from the effects of substitutional disorder on the entropy and enthalpy. In this paper, the additional effects of the vibrational free energy, the electronic entropy, and the energy associated with structural relaxations on the thermodynamic properties and calculated phase equilibria for Cd-Mg alloys are studied. Ground-state properties and the densities of states of stable and metastable Cd-Mg compounds with hcp-based structures have been calculated with the linear muffin-tin orbital (LMTO) method. The results of these LMTO calculations are combined with the cluster variation method to calculate the configurational free energy and electronic entropy of ordered and disordered alloys from first principles. The vibrational free energy is treated using the Debye model; the configurational dependence of the Debye temperature is obtained semiempirically from experimentally measured entropies of formation in combination with the results of the LMTO calculations. The energy associated with structural relaxations is estimated from experimentally measured lattice parameters and elastic constants. We find that, although the configurational free energy is the largest component of the total alloy free energy, nonconfigurational effects contribute significantly to thermodynamic properties, and hence appreciably affect the calculated Cd-Mg phase diagram. C1 LAWRENCE BERKELEY LAB, DEPT MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. NR 74 TC 63 Z9 64 U1 1 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 748 EP 766 DI 10.1103/PhysRevB.48.748 PG 19 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500008 ER PT J AU LEISURE, RG SCHWARZ, RB MIGLIORI, A TORGESON, DR SVARE, I ANDERSON, IS AF LEISURE, RG SCHWARZ, RB MIGLIORI, A TORGESON, DR SVARE, I ANDERSON, IS TI DEUTERIUM MOTION IN YTTRIUM STUDIED BY ULTRASONIC MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Article ID ANELASTIC RELAXATION MEASUREMENTS; NEUTRON-SCATTERING; HYDROGEN RELAXATION; SOLID-SOLUTIONS; ALPHA-LUDX; SCANDIUM; NIOBIUM; SYSTEM; DIFFUSION; LUTETIUM AB Ultrasonic-attenuation measurements in YD0.10 reveal broad, asymmetric attenuation peaks that are interpreted in terms of rapid motion of deuterium among interstitial sites in the Y metal lattice. The results are well described with a model involving tunneling among highly asymmetric sites. A weakly temperature-dependent relaxation rate, compatible with coupling of the sites to electrons, accounts for the relaxation up to about 70 K. At higher temperatures a strongly temperature-dependent relaxation rate becomes dominant. The major asymmetries that are responsible for the coupling of the tunneling centers to the ultrasound are attributed to the interaction between D atoms that lie on different c axes. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV TRONDHEIM,DEPT PHYS,N-7034 TRONDHEIM,NORWAY. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP LEISURE, RG (reprint author), COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523, USA. NR 40 TC 18 Z9 18 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 887 EP 892 DI 10.1103/PhysRevB.48.887 PG 6 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500024 ER PT J AU LEISURE, RG SCHWARZ, RB MIGLIORI, A TORGESON, DR SVARE, I AF LEISURE, RG SCHWARZ, RB MIGLIORI, A TORGESON, DR SVARE, I TI HYDROGEN-ISOTOPE MOTION IN SCANDIUM STUDIED BY ULTRASONIC MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Article ID ANELASTIC RELAXATION MEASUREMENTS; ALPHA-SCDX SYSTEMS; NEUTRON-SCATTERING; SOLID-SOLUTIONS; NIOBIUM; METAL; DEUTERIUM; DIFFUSION; VIBRATION; LUTETIUM AB Resonant ultrasound spectroscopy has been used to investigate ultrasonic attenuation in single crystals of Sc, ScH0.25, and ScD0.18 over the temperature range of 10-300 K for frequencies near 1 MHz. Ultrasonic-attenuation peaks were observed in the samples containing H or D with the maximum attenuation occurring near 25 K for ScH0.25 and near 50 K for ScD0.18. The general features of the data suggest that the motion reflected in the ultrasonic attenuation is closely related to the low-temperature motion seen in nulcear-magnetic-resonance spin-lattice-relaxation measurements. The ultrasonic results were fit with a two-level-system (TLS) model involving tunneling between highly asymmetric sites. The relaxation of the TLS was found to consist of two parts: a weakly temperature-dependent part, probably due to coupling to electrons; and, a much more strongly temperature-dependent part, attributed to multiple-phonon processes. The strongly temperature-dependent part was almost two orders of magnitude faster in ScH0.25 than in ScD0.18, in accordance with the idea that tunneling is involved in the motion. Surprisingly, the weakly temperature-dependent part was found to be about the same for the two isotopes. The asymmetries primarily responsible for coupling the TLS to the ultrasound are attributed to interactions between hydrogen ions that lie on adjacent c axes. The results are consistent with an isotope-independent strength for the coupling of the TLS to the ultrasound. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV TRONDHEIM,DEPT PHYS,N-7034 TRONDHEIM,NORWAY. RP LEISURE, RG (reprint author), COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523, USA. NR 42 TC 22 Z9 22 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 893 EP 900 DI 10.1103/PhysRevB.48.893 PG 8 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500025 ER PT J AU NGUYEN, PP WANG, ZH RAO, AM DRESSELHAUS, MS MOODERA, JS DRESSELHAUS, G RADOUSKY, HB GLASS, RS LIU, JZ AF NGUYEN, PP WANG, ZH RAO, AM DRESSELHAUS, MS MOODERA, JS DRESSELHAUS, G RADOUSKY, HB GLASS, RS LIU, JZ TI TRANSPORT AND MAGNETIC-PROPERTIES OF YBA2CU3O7-DELTA-BRY SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HALOGEN VAPORS; TRANSITION; ANISOTROPY; YBA2CU3O7; BEHAVIOR; STATE AB Deoxygenated nonsuperconducting YBa2Cu3O6.2 (YBCO) single crystals doped with Br are studied. The resulting crystals become superconducting with T(c) approximately 92 K, DELTAT(c) approximately 1.0 K as determined by four-point-probe resistivity, measurements. The resistivity in our best sample decreases linearly with temperature. The large ratio in the resistivity at 300 K of the brominated to the pristine YBCO single crystals (approximately 35:1) suggests that bromination greatly increases the scattering rate. The upper critical field H(c2)(T) parallel and perpendicular to the ab plane is determined resistively. H(c2)(0) and the corresponding coherence lengths xi(ab)(0) and xi(c)(0) are estimated. A comparison with the fully oxygenated YBCO single crystals shows that xi(ab)(0) remains approximately the same, whereas xi(c)(0) decreases by a factor of approximately 3, suggesting that Br never enters the CUO2 Planes. The pinning energy for vortex motion in the ab plane decreases after bromination and this decrease can be attributed to the increased anisotropy. For vortex motion along the c axis, however, the pinning energy decreases or increases depending on temperature and field. Compared with the fully oxygenated YBCO single crystals, the critical current density is suppressed by bromination and is strongly dependent on the applied magnetic field. The reduced lower critical field H(c1) in the brominated YBCO single crystals indicates a reduction in the carrier density (by a factor of between 2 and 3), which is consistent with the observed reduction in the plasma frequency. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP NGUYEN, PP (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 32 TC 19 Z9 19 U1 3 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 1148 EP 1155 DI 10.1103/PhysRevB.48.1148 PG 8 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500053 ER PT J AU HWA, T NELSON, DR VINOKUR, VM AF HWA, T NELSON, DR VINOKUR, VM TI FLUX-LINE PINNING BY COMPETING DISORDERS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; 2-DIMENSIONAL VORTEX GLASSES; QUENCHED RANDOM IMPURITIES; THERMAL FLUCTUATIONS; II SUPERCONDUCTORS; BOSON LOCALIZATION; TRANSITION; CRYSTALS; LIQUIDS; YBA2CU3O7 AB Localization of flux lines by columnar defects is investigated in the presence of point disorder. A (1 + 1)-dimensional model is analyzed in some detail. When point disorder is weak, the phase transition is found to be of the Bose-glass type. Some aspects of the Bose-glass phase itself may be marginally unstable to weak point disorder, but only beyond an astronomically large crossover scale. Correlated disorder is always irrelevant when point disorder is very strong. The Bose-glass transition is also studied in a small transverse magnetic field. Critical exponents for the commensurate-incommensurate transition that occurs in this case are derived using scaling arguments. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP HWA, T (reprint author), HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138, USA. RI Hwa, Terence/J-4012-2013 OI Hwa, Terence/0000-0003-1837-6842 NR 39 TC 102 Z9 103 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 1167 EP 1174 DI 10.1103/PhysRevB.48.1167 PG 8 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500056 ER PT J AU CHEN, XF MARONE, MJ TESSEMA, GX SKOVE, MJ NEVITT, MV MILLER, DJ VEAL, BW AF CHEN, XF MARONE, MJ TESSEMA, GX SKOVE, MJ NEVITT, MV MILLER, DJ VEAL, BW TI CONDUCTIVITY AND PARACONDUCTIVITY IN (BI,PB)2SR2CAN-1CUNOX WHISKERS SO PHYSICAL REVIEW B LA English DT Article ID O THIN-FILMS; SINGLE-CRYSTALS; THERMODYNAMIC FLUCTUATIONS; EXCESS CONDUCTIVITY; SUPERCONDUCTIVITY; RESISTIVITY; STATE; TRANSPORT; SYSTEM AB We have measured the resiStiVitY Of (Bi,Pb)2Sr2Can-1CunOx single-crystal whiskers in the a and c directions. Our results indicate that the whiskers may be either 2:2:1:2 (n = 1) or 2:2:2:3 (n = 2) or have both phases present. Well above T(c), the resistivity in the a direction decreases linearly with temperature. We also studied the paraconductivity due to thermal fluctuations above T(c). The paraconductivity in the a direction shows quasi-one-dimensional behavior for temperatures close to T(c). This quasi-one-dimensional behavior may be due to a percolative conduction path. For the c direction, the resistivity is best fit by rho(c) = Ae(-Eg/kT), where T is the temperature. However, as T approaches T(c) from above, rho(c) increases much faster than a thermally activated law, perhaps because of the fluctuations. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP CHEN, XF (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. NR 22 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 1254 EP 1257 DI 10.1103/PhysRevB.48.1254 PG 4 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500067 ER PT J AU LEISURE, RG SCHWARZ, RB MIGLIORI, A LEI, M AF LEISURE, RG SCHWARZ, RB MIGLIORI, A LEI, M TI ROOM-TEMPERATURE ELASTIC-CONSTANTS OF SC AND SCD0.18 SO PHYSICAL REVIEW B LA English DT Note ID ULTRASONIC-ATTENUATION; ALPHA-ALPHA' PHASE; NB-H(D) SYSTEM; HYDROGEN; RELAXATION; DEUTERIUM; VIBRATION; YTTRIUM; METALS; MODES AB The complete set of elastic constants for Sc and ScD0.18 has been measured at room temperature. The results show that the addition of hydrogen to this rare-earth metal has a qualitatively different effect than the addition of hydrogen to transition metals such as palladium, vanadium, niobium, and tantalum. In the case of Sc all five elastic constants increase with the addition of hydrogen. The bulk modulus for ScD0.18 is 9.5% higher than that for Se. The Debye temperature computed from the room-temperature elastic constants is 355 K for Sc and 371 K for ScD0.18. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP LEISURE, RG (reprint author), COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523, USA. NR 34 TC 14 Z9 14 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 1276 EP 1279 DI 10.1103/PhysRevB.48.1276 PG 4 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500070 ER PT J AU DEAK, J MCELFRESH, M MUENCHAUSEN, R FOLTYN, S DYE, R AF DEAK, J MCELFRESH, M MUENCHAUSEN, R FOLTYN, S DYE, R TI FREQUENCY INDEPENDENCE OF THE VORTEX-GLASS TRANSITION IN YBA2CU3O7-DELTA THIN-FILMS SO PHYSICAL REVIEW B LA English DT Note ID BA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; FLUX CREEP; CRYSTAL; PHASE; DEPOSITION AB The frequency dependence of the vortex-glass phase transition in a YBa2Cu3O7-delta thin film was measured at frequencies ranging from 10(-1) to 10(5) Hz in applied fields H ranging from 0 to 50 kOe. The transition temperature T(g) and the critical scaling parameter nu(z - 1) were determined from the scaling of both current-voltage characteristics and the resistivity measurements. The critical scaling parameters determined by different methods are found to agree [nu(z - 1) = 7.2+/-0.3] and are consistent with the predictions of the continuous vortex-glass phase transition described by Fisher, Fisher, and Huse [Phys. Rev. B 43, 130 (1991)]. No frequency dependence is observed for the vortex-glass transition temperature T(g), for the range of parameters studied here. While the data do provide further support for the existence of a continuous vortex-glass phase transition, no evidence for the divergent time scale is observed, setting an upper limit of 10(-5) sec for this time scale at (T - T(g))/T(g) almost-equal-to 0.02. Since ac-susceptibility data do not actually measure the ''irreversibility line'' (IRL), these results provide a fundamental measurement of the frequency dependence of the IRL. The observed frequency dependence is inconsistent with the flux-creep-based picture of the IRL. C1 LOS ALAMOS NATL LAB,STC,LOS ALAMOS,NM 87545. RP DEAK, J (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. NR 24 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1993 VL 48 IS 2 BP 1337 EP 1340 DI 10.1103/PhysRevB.48.1337 PG 4 WC Physics, Condensed Matter SC Physics GA LM885 UT WOS:A1993LM88500086 ER PT J AU CHRIEN, RE KOENE, BKS STELTS, ML MEYER, RA BRANT, S PAAR, V LOPAC, V AF CHRIEN, RE KOENE, BKS STELTS, ML MEYER, RA BRANT, S PAAR, V LOPAC, V TI NEUTRON-CAPTURE GAMMA-RAY STUDY OF LEVELS IN BA-135 AND DESCRIPTION OF NUCLEAR-LEVELS IN THE INTERACTING-BOSON-FERMION MODEL SO PHYSICAL REVIEW C LA English DT Article ID COLLECTIVE STATES; BARIUM ISOTOPES; O(6) LIMIT; ODD NUCLEI; MOMENTS; REGION; CHAOS; EVEN AB We have performed neutron-capture gamma-ray studies on natural and enriched targets of Ba-134 in order to investigate the nuclear levels of Ba-135. The low-energy level spectra were compared with the calculations using the interacting-boson-fermion model (IBFM) and the cluster-vibration model. The level densities up to 5 MeV that are calculated within the IBFM are in accordance with the constant temperature Fermi gas model. From the spin distribution we have determined the corresponding spin cutoff parameter sigma and compared it to the prediction from nuclear systematics. C1 MONTGOMERY COLL,ROCKVILLE,MD 20850. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV ZAGREB,FAC SCI,DEPT PHYS,41000 ZAGREB,CROATIA. UNIV ZAGREB,FAC TECHNOL,41000 ZAGREB,CROATIA. RP CHRIEN, RE (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Paar, Vladimir/D-8009-2015 NR 52 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 109 EP 117 DI 10.1103/PhysRevC.48.109 PG 9 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300014 ER PT J AU KOLSKY, KL KAROL, PJ AF KOLSKY, KL KAROL, PJ TI DEEP SPALLATION OF MEDIUM MASS ISOTOPES BY PROTONS SO PHYSICAL REVIEW C LA English DT Article ID FRAGMENTATION CROSS-SECTIONS; ENERGY ALPHA-PARTICLES; ISOBARIC YIELD CURVES; NUCLEAR-REACTIONS; RELATIVISTIC NUCLEI; CARBON TARGETS; C-12 IONS; HYDROGEN; COPPER; HELIUM AB Spallation systematics have been extended into the deep spallation mass region. Production cross sections of scandium radioisotopes from 0.8 GeV protons on Y-89, Mo-92, Mo-96, Mo-100 and Te-130 targets were measured and the cross sections were used to generate isobaric yield curves at A(p) =47. In the latter target, this corresponds to a mass loss of > 80 nucleons. At approximately 10 MeV/nucleon and for products outside the multifragmentation region, this is an extreme manifestation of the spallation process. The results prove to fit smooth extrapolations from trends developed in earlier work on less deep spallation. The influence of target composition is still evident even from Te-130, in contrast to expectations, based on evaporation considerations, that this so-called memory effect would wash out. C1 CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. RP KOLSKY, KL (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 54 TC 1 Z9 1 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 236 EP 244 DI 10.1103/PhysRevC.48.236 PG 9 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300029 ER PT J AU KORMANYOS, CM PETERSON, RJ APPLEGATE, J BECK, J AVERETT, TD RITCHIE, BG MORRIS, CL MCGILL, J OAKLEY, DS AF KORMANYOS, CM PETERSON, RJ APPLEGATE, J BECK, J AVERETT, TD RITCHIE, BG MORRIS, CL MCGILL, J OAKLEY, DS TI LOW-ENERGY PION-SCATTERING TO 1(-) STATES IN C-12 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS ELASTIC-SCATTERING; INELASTIC-SCATTERING; DIPOLE RESONANCE; 1+ DOUBLET AB Differential cross sections for 40, 50 and 65 MeV pi+ and pi- inelastic scattering to 1- excitations in 12 C have been measured and compared to distorted wave impulse approximation (DWIA) reaction model predictions. Strengths are presented in terms of sum rules for the 1- state at 10.84 MeV and for the giant dipole resonance from 18 to 25 MeV. An excitation function at q =224 MeV/c for the 1- state at 10.84 MeV is displayed in the energy range from 50 to 291 MeV, showing a non-spinflip pattern. We find inadequacies in the detailed comparison of the shapes of the data to DWIA calculations using several standard nuclear models. C1 ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LEWIS & CLARK COLL,PORTLAND,OR 97219. RP KORMANYOS, CM (reprint author), UNIV COLORADO,BOULDER,CO 80309, USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 250 EP 255 DI 10.1103/PhysRevC.48.250 PG 6 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300031 ER PT J AU MCNAUGHTON, MW JOHNSTON, K SWENSON, DR TUPA, D YORK, RL AMBROSE, DA COFFEY, P MCNAUGHTON, KH RILEY, PJ GLASS, G HIEBERT, JC JEPPESEN, RH SPINKA, H SUPEK, I TRIPARD, GE WOOLVERTON, H AF MCNAUGHTON, MW JOHNSTON, K SWENSON, DR TUPA, D YORK, RL AMBROSE, DA COFFEY, P MCNAUGHTON, KH RILEY, PJ GLASS, G HIEBERT, JC JEPPESEN, RH SPINKA, H SUPEK, I TRIPARD, GE WOOLVERTON, H TI NP-ELASTIC ANALYZING POWER AN0 AND SPIN TRANSFER KNN SO PHYSICAL REVIEW C LA English DT Article ID DIFFERENTIAL CROSS-SECTION; LESS-THAN 180-DEGREES; DELTA-SIGMA-L; NEUTRON-PROTON; SCATTERING EXPERIMENTS; INTERMEDIATE ENERGIES; CORRELATION PARAMETER; PHASE-SHIFTS; NUCLEON; BEAM AB We have measured the analyzing power A(NO) and the spin transfer K(NN) for np-elastic scattering from about 60-degrees to 170-degrees c.m. at 485, 635, and 788 MeV. The new data clarify previous discrepancies and complete the first-order determination of nucleon-nucleon elastic scattering at these energies. C1 UNIV TEXAS,AUSTIN,TX 78712. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV MONTANA,MISSOULA,MT 59812. ARGONNE NATL LAB,ARGONNE,IL 60439. RUDJER BOSKOVIC INST,41001 ZAGREB,CROATIA. WASHINGTON STATE UNIV,PULLMAN,WA 99164. UNIV CENT ARKANSAS,CONWAY,AR 72032. RP MCNAUGHTON, MW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 63 TC 19 Z9 19 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 256 EP 265 DI 10.1103/PhysRevC.48.256 PG 10 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300032 ER PT J AU MARCHETTI, AA MIGNEREY, AC MADANI, H GOKMEN, A KEHOE, WL LIBBY, B MORLEY, K BREUER, H WOLF, K OBENSHAIN, F AF MARCHETTI, AA MIGNEREY, AC MADANI, H GOKMEN, A KEHOE, WL LIBBY, B MORLEY, K BREUER, H WOLF, K OBENSHAIN, F TI MASS AND CHARGE-DISTRIBUTIONS OF CL-INDUCED HEAVY-ION REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID FERMI ENERGY DOMAIN; 8.5 MEV GE-74; EXCITATION-ENERGY; NUCLEON EXCHANGE; ANGULAR-MOMENTUM; COLLISIONS; TRANSPORT; EQUILIBRATION AB Projectilelike fragments were detected and characterized in terms of A, Z, and energy for the reactions Cl-37 on Ca-40 and Bi-209 at E = 7.3 MeV/nucleon, and C-35 on Bi-209 at E = 15 MeV/nucleon, at angles close to the grazing angle. Mass and charge distributions were generated in the N-Z plane as a function of energy loss, and parametrized in terms of their centroids, variances, and coefficients of correlation. The results are compared to the predictions of two current models based on a stochastic nucleon exchange mechanism. The drifts of the charge and mass centroids for the system Cl-37 on Ca-40 are consistent with a process of mass and charge equilibration mediated by nucleon exchange between the two partners, followed by evaporation. The asymmetric systems show a strong drift toward larger asymmetry, with the production of neutron-rich nuclei. It is concluded that this is the result of a net transfer of protons from the light to the heavy partner, and a net flow of neutrons in the opposite direction. Model predictions fail to reproduce in detail the evolution of the centroids for asymmetric systems. The variances for all systems increase with energy loss, as would be expected from a nucleon exchange mechanism. However, the variances for the reaction Cl-37 on 40 Ca are higher than those expected from that mechanism, and the variances for the reaction Cl-35 on Bi-209 start decreasing after about 100 MeV of energy loss. The coefficients of correlation indicate that the transfer of nucleons between projectile and target is correlated, as expected from Q-value constraints to the valley of beta stability. C1 UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742. ARGONNE NATL LAB,ARGONNE,IL 60439. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Mignerey, Alice/D-6623-2011 NR 35 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 266 EP 289 DI 10.1103/PhysRevC.48.266 PG 24 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300033 ER PT J AU ESBENSEN, H BERTSCH, GF IEKI, K AF ESBENSEN, H BERTSCH, GF IEKI, K TI MOMENTUM DISTRIBUTIONS FOR (LI-11 LI-9+N+N)BREAKUP REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID LI-11; FRAGMENTATION; DISSOCIATION AB We have calculated the momentum distributions of the three fragments emitted in the breakup reaction (Li-11, Li-9 + n + n), induced by the Coulomb field from a heavy target, and made comparisons to recent three-body coincidence measurements. Our three-body model for Li-11 provides a good description of the measured relative momentum distribution for the two emitted neutrons, and also for the single-neutron momentum distribution. The predicted distribution for the Li-9 recoil is much narrower than observed; a plausible explanation is presented. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP ESBENSEN, H (reprint author), MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824, USA. NR 16 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 326 EP 331 DI 10.1103/PhysRevC.48.326 PG 6 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300038 ER PT J AU GILMAN, R FORTUNE, HT KAGARLIS, M AF GILMAN, R FORTUNE, HT KAGARLIS, M TI SEQUENTIAL CONTRIBUTION TO NONANALOG PION DOUBLE-CHARGE-EXCHANGE IN THE DELTA-33 RESONANCE REGION SO PHYSICAL REVIEW C LA English DT Article ID SYSTEMATICS; DEPENDENCE AB In double charge exchange leading to residual nonanalog 0+ground states, we examine the relative contribution of sequential charge exchange and delta-nucleon charge exchange. We conclude that the data cannot be quantitatively understood in terms of these two reaction mechanisms. C1 CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. UNIV PENN,PHILADELPHIA,PA 19104. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GILMAN, R (reprint author), RUTGERS UNIV,PISCATAWAY,NJ 08855, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 366 EP 369 DI 10.1103/PhysRevC.48.366 PG 4 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300043 ER PT J AU CONZETT, HE AF CONZETT, HE TI NULL TESTS OF TIME-REVERSAL INVARIANCE SO PHYSICAL REVIEW C LA English DT Article ID PROTON-PROTON-SCATTERING; PARITY NONCONSERVATION; NEUTRON RESONANCES; VIOLATION; POLARIZATION; ASYMMETRY; LA-139; OPTICS; HO-165 AB Because null tests of parity conservation exist in nuclear and particle reactions, it has been possible to measure very precisely the (weak-interaction) parity nonconserving contribution to the process. There is, however, a proof of the nonexistence of a comparable null test of time-reversal invariance. As a result, reaction tests of T symmetry have, at best, achieved precisions several orders of magnitude below that of the tests of P symmetry. Since transmission experiments are not included in the nonexistence proof, the existing formalism used to describe spin observables in neutron transmission experiments has been expanded to include explicitly the target spin. Through this formalism, the time-reversal-violating (and parity nonconserving) forward scattering amplitudes are identified, along with the corresponding spin observables. It is noted that new and more precise tests of T symmetry are provided in transmission experiments, and that such investigations are applicable more generally in nuclear and particle physics. RP CONZETT, HE (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 27 TC 25 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 423 EP 428 DI 10.1103/PhysRevC.48.423 PG 6 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300050 ER PT J AU HOREN, DJ AUBLE, RL WU, CY CLINE, D DEVLIN, M IBBOTSON, R SIMON, MW AF HOREN, DJ AUBLE, RL WU, CY CLINE, D DEVLIN, M IBBOTSON, R SIMON, MW TI HALF-LIFE OF THE 2-1(+) STATE OF ZR-94 SO PHYSICAL REVIEW C LA English DT Note ID LIFETIMES AB The half-life of the 2(1)+ state of Zr-94 is measured as T1/2 = 7.26+/-0.42 ps, which corresponds to B(E2) up = 0.060+/-0.004 e2b2. C1 UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. RP HOREN, DJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Devlin, Matthew/B-5089-2013 OI Devlin, Matthew/0000-0002-6948-2154 NR 7 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 433 EP 435 DI 10.1103/PhysRevC.48.433 PG 3 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300052 ER PT J AU TOTH, KS SOUSA, DC NITSCHKE, JM VIERINEN, KS WILMARTH, PA AF TOTH, KS SOUSA, DC NITSCHKE, JM VIERINEN, KS WILMARTH, PA TI IDENTIFICATION OF THE S(1/2) DY-145 GROUND-STATE SO PHYSICAL REVIEW C LA English DT Note ID DECAY AB The electron capture and beta+-decay properties of 145Dy (produced in Ni-58 + Mo-92 irradiations) were investigated following mass separation of A = 145 isobars. A new 6(2)-s activity was identified and assigned to the vs1/2 145Dy ground state. Its decay to low-spin levels in 145Tb indicates that the base state for low-spin levels in this N = 80 odd-Z nucleus is probably pid3/2 rather than pis1/2, as is the case for terbium nuclei with N = 82, 84, and 86. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. EASTERN KENTUCKY UNIV,RICHMOND,KY 40475. RP TOTH, KS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 10 TC 7 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 436 EP 438 DI 10.1103/PhysRevC.48.436 PG 3 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300053 ER PT J AU KOEHLER, PE AF KOEHLER, PE TI N-14 (N,P) C-14 CROSS-SECTION NEAR THERMAL-ENERGY SO PHYSICAL REVIEW C LA English DT Note ID NUCLEOSYNTHESIS; N-14(N,P)C-14; FLUORINE AB The N-14(n,p)C-14 cross section was measured, relative to Li-6(n,alpha)H-3, from thermal energy to approximately 5 eV. The measured cross section has a shape indistinguishable from 1/v. The astrophysical implications of this result are discussed RP KOEHLER, PE (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,P-17 GRP,LOS ALAMOS,NM 87545, USA. OI Koehler, Paul/0000-0002-6717-0771 NR 15 TC 6 Z9 6 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 439 EP 440 DI 10.1103/PhysRevC.48.439 PG 2 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300054 ER PT J AU TOTH, KS WILMARTH, PA NITSCHKE, JM SOUSA, DC AF TOTH, KS WILMARTH, PA NITSCHKE, JM SOUSA, DC TI OBSERVATION OF ER-146 ELECTRON-CAPTURE AND BETA+ DECAY SO PHYSICAL REVIEW C LA English DT Note ID IDENTIFICATION AB In an investigation of A = 146 isobars, produced in Ni-58 bombardments of Mo-92, the electron capture and beta+ decay of the previously unknown isotope 146Er was identified. This nuclidic assignment was based on the observation of Ho K x rays in coincidence with beta-delayed protons as well as in total-projected coincidence gamma-ray spectra. From the time distribution of the x-ray events seen in these total-projected spectra the half-life of 146Er was determined to be 1.7(6) s. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. EASTERN KENTUCKY UNIV,RICHMOND,KY 40475. RP TOTH, KS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 12 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 445 EP 447 DI 10.1103/PhysRevC.48.445 PG 3 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300056 ER PT J AU DONANGELO, R LOPEZ, JA RANDRUP, J AF DONANGELO, R LOPEZ, JA RANDRUP, J TI ENERGY-DEPENDENCE OF MASSIVE-FRAGMENT MULTIPLICITY SO PHYSICAL REVIEW C LA English DT Note ID NUCLEUS COLLISIONS; MULTIFRAGMENTATION; EMISSION; DISINTEGRATION; EVAPORATION; RESIDUES; FISSION; YIELDS; MODEL AB The production of several massive fragments in the decay of a very excited compound nucleus is studied using simultaneous and sequential mechanisms of fragment production. The calculated massive-fragment multiplicities exhibit remarkably similar behaviors as functions of the excitation energy, thus ruling out using this observable as an experimental signature of the dominant fragmentation mechanism. C1 LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP 465 EP 467 DI 10.1103/PhysRevC.48.465 PG 3 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300062 ER PT J AU ZHANG, JY CASTEN, RF ZAMFIR, NV AF ZHANG, JY CASTEN, RF ZAMFIR, NV TI RELATION OF COLLECTIVE OBSERVABLES TO NUCLEAR SHAPES SO PHYSICAL REVIEW C LA English DT Note AB The recent finding that yrast B (E2) values and yrast energy ratios behave differently in nuclear transitional regions suggests that these two observables reflect collectivity in rather different ways. In this paper, these observables are systematically studied over most of the nuclear chart with a Nilsson-Strutinsky-BCS method, leading to a rather simple, qualitative distinction between them, namely that B (E2:21+ --> 01+) values are primarily sensitive to the location of the minimum in the potential energy surface, while energies seem to reflect the detailed shape and anharmonicities of the potential. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. INST MODERN PHYS,LANZHOU,PEOPLES R CHINA. CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,BUCHAREST,ROMANIA. RP ZHANG, JY (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 8 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JUL PY 1993 VL 48 IS 1 BP R10 EP R12 DI 10.1103/PhysRevC.48.R10 PG 3 WC Physics, Nuclear SC Physics GA LL893 UT WOS:A1993LL89300003 ER PT J AU ALVERSON, G BAKER, WF BALLOCCHI, G BENSON, R BERG, D BLUSK, S BROMBERG, C BROWN, D CAREY, D CHAND, T CHANDLEE, C CHOUDHARY, BC CHUNG, WH DEBARBARO, L DESOI, W DLUGOSZ, W DUNLEA, J EASO, S ENGELS, E FAISSLER, W FANOURAKIS, G FERBEL, T GARELICK, D GINTHER, G GLASS, G GLAUBMAN, M GUTIERREZ, P HARTMAN, K HUSTON, J JOHNSTONE, C KAPOOR, V KOURBANIS, I LANARO, A LIRAKIS, C LOBKOWICZ, F LUKENS, P MANI, S MAUL, A MANSOUR, J MILLER, R NELSON, CA OH, BY ORRIS, D POTHIER, E PREBYS, E RAJARAM, BM ROSER, R RUDDICK, K SHEPARD, P SHIVPURI, RK SINANIDIS, A SKOW, D SLATTERY, P SORRELL, L TOOTHACKER, W VARELAS, N WEERASUNDARA, D WHITMORE, J WU, G YASUDA, T YOSEF, C ZIELINSKI, M AF ALVERSON, G BAKER, WF BALLOCCHI, G BENSON, R BERG, D BLUSK, S BROMBERG, C BROWN, D CAREY, D CHAND, T CHANDLEE, C CHOUDHARY, BC CHUNG, WH DEBARBARO, L DESOI, W DLUGOSZ, W DUNLEA, J EASO, S ENGELS, E FAISSLER, W FANOURAKIS, G FERBEL, T GARELICK, D GINTHER, G GLASS, G GLAUBMAN, M GUTIERREZ, P HARTMAN, K HUSTON, J JOHNSTONE, C KAPOOR, V KOURBANIS, I LANARO, A LIRAKIS, C LOBKOWICZ, F LUKENS, P MANI, S MAUL, A MANSOUR, J MILLER, R NELSON, CA OH, BY ORRIS, D POTHIER, E PREBYS, E RAJARAM, BM ROSER, R RUDDICK, K SHEPARD, P SHIVPURI, RK SINANIDIS, A SKOW, D SLATTERY, P SORRELL, L TOOTHACKER, W VARELAS, N WEERASUNDARA, D WHITMORE, J WU, G YASUDA, T YOSEF, C ZIELINSKI, M TI PRODUCTION OF DIRECT PHOTONS AND NEUTRAL MESONS AT LARGE TRANSVERSE-MOMENTA BY BETA- AND P BEAMS AT 500-GEV/C SO PHYSICAL REVIEW D LA English DT Article ID LUND MONTE-CARLO; ETA-PRODUCTION; PROTON-PROTON; 280 GEV/C; INCLUSIVE PRODUCTION; QCD PREDICTIONS; CROSS-SECTIONS; GLUON CONTENT; CERN ISR; COLLISIONS AB We present results from the initial run of Fermilab experiment E706. The data include incident pi- and p beams at 500 GeV/c on Be and Cu targets, and span the kinematic ranges of transverse momentum and rapidity of 3.5 less-than-or-equal-to p(T) less-than-or-equal-to 10 GeV/c and -0.7 less-than-or-equal-to y(c.m.) less-than-or-equal-to 0.7, respectively. We have measured cross sections for pi0 and direct-photon production, as well as the eta/pi0 production ratio. Rom the data on Be and Cu, we have extracted the nuclear dependence of pi0 production, parametrized as A(alpha). The cross sections are compared with next-to-leading-log QCD predictions for different choices of the QCD momentum scales and several sets of paxton distribution functions. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV DELHI,DELHI 110007,INDIA. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. MICHIGAN STATE UNIV,E LANSING,MI 48824. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. UNIV OKLAHOMA,NORMAN,OK 73019. PENN STATE UNIV,UNIV PK,PA 16802. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV ROCHESTER,ROCHESTER,NY 14627. RP ALVERSON, G (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. RI Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011 NR 59 TC 49 Z9 49 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 5 EP 28 DI 10.1103/PhysRevD.48.5 PG 24 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900002 ER PT J AU SILL, AF ARNOLD, RG BOSTED, PE CHANG, CC GOMEZ, J KATRAMATOU, AT MARTOFF, CJ PETRATOS, GG RAHBAR, AA ROCK, SE SZALATA, ZM SHERDEN, DJ LAMBERT, JM LOMBARDNELSEN, RM AF SILL, AF ARNOLD, RG BOSTED, PE CHANG, CC GOMEZ, J KATRAMATOU, AT MARTOFF, CJ PETRATOS, GG RAHBAR, AA ROCK, SE SZALATA, ZM SHERDEN, DJ LAMBERT, JM LOMBARDNELSEN, RM TI MEASUREMENTS OF ELASTIC ELECTRON-PROTON SCATTERING AT LARGE MOMENTUM-TRANSFER SO PHYSICAL REVIEW D LA English DT Article ID NUCLEON FORM-FACTORS; QCD SUM-RULES; QUARK-HADRON DUALITY; EXCLUSIVE PROCESSES; PERTURBATIVE QCD; QUANTUM CHROMODYNAMICS; DISTRIBUTION AMPLITUDES; ASYMPTOTIC-BEHAVIOR; ELECTROMAGNETIC STRUCTURE; WAVE-FUNCTIONS AB Measurements of the forward-angle differential cross section for elastic electron-proton scattering were made in the range of momentum transfer from Q2=2.9 to 31.3 (GeV/c)2 using an electron beam at the Stanford Linear Accelerator Center. The data span six orders of magnitude in cross section. Combinded statistical and systematic uncertainties in the cross section measurements ranged from 3.6% at low Q2 to 19% at high Q2. These data have been used to extract the proton magnetic form factor G(M)p(Q2) and Dirac form factor F-1(p)(Q2) by using form factor scaling. The logarithmic falloff of QF-4(1)p expected from leading twist predictions of perturbative quantum chromodynamics is consistent with the new data at high Q2. Some nonperturbative and hybrid calculations also agree with our results. C1 AMERICAN UNIV,WASHINGTON,DC 20016. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. GEORGETOWN UNIV,DEPT PHYS,WASHINGTON,DC 20057. CE SACLAY,SPHN,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV MARYLAND,DEPT PHYS & ASTRON,COLL PK,MD 20742. NR 82 TC 147 Z9 147 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 29 EP 55 DI 10.1103/PhysRevD.48.29 PG 27 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900003 ER PT J AU ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DANNER, GM DUBOSCQ, J ELLIOTT, JR ESCOBAR, CO GIBNEY, MC GORDON, AS HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T ONG, P PINFOLD, J PUNKAR, G PUROHIT, MV RAAB, JR ROSS, WR SANTORO, AFS SHOUP, AL SIDHU, JS SLIWA, K SOKOLOFF, MD SOUZA, MHG STREETMAN, ME STUNDZIA, AB VOLKMUTH, WD WITHERELL, MS AF ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DANNER, GM DUBOSCQ, J ELLIOTT, JR ESCOBAR, CO GIBNEY, MC GORDON, AS HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T ONG, P PINFOLD, J PUNKAR, G PUROHIT, MV RAAB, JR ROSS, WR SANTORO, AFS SHOUP, AL SIDHU, JS SLIWA, K SOKOLOFF, MD SOUZA, MHG STREETMAN, ME STUNDZIA, AB VOLKMUTH, WD WITHERELL, MS TI DALITZ PLOT ANALYSIS OF D-]K-PI-PI DECAYS SO PHYSICAL REVIEW D LA English DT Article ID D+ AB Decays of the D0 meson to K-pi+pi0 and KBAR0pi+pi- and of the D+ to K-pi+pi+ have been analyze for resonant substructure. We present results on the amplitudes and phases of each decay mode and compare the results with other measurements. We confirm the highly nonresonant nature of the D+ to K-pi+pi+ decays. There is general agreement with theoretical models for the branching ratios measured. C1 CTR BRASILEIRO PESQUISAS FIS,RIO JANEIRO,BRAZIL. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. CARLETON UNIV,OTTAWA K1S 5B6,ONTARIO,CANADA. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,UNIVERSITY,MS 38677. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV SAO PAULO,SAO PAULO,BRAZIL. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. YALE UNIV,NEW HAVEN,CT 06511. RI Anjos, Joao/C-8335-2013; OI Bean, Alice/0000-0001-5967-8674 NR 10 TC 57 Z9 57 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 56 EP 62 DI 10.1103/PhysRevD.48.56 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900004 ER PT J AU TSAI, YS AF TSAI, YS TI LASER+E--]GAMMA+E- AND LASER+GAMMA-]E++E- AS SOURCES OF PRODUCING CIRCULARLY-POLARIZED GAMMA AND E+/- BEAMS SO PHYSICAL REVIEW D LA English DT Article AB Helicity amplitudes of reactions of laser-electron scattering and laser + gamma --> e+ + e- are investigated. Mechanisms to produce nearly 100% circularly polarized gamma and e+/- beams are discussed using the above-mentioned reactions. Circularly polarized e+/- beams from circularly polarized gamma's impinging upon an atomic target are also investigated. RP TSAI, YS (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 19 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 96 EP 115 DI 10.1103/PhysRevD.48.96 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900008 ER PT J AU HYER, T AF HYER, T TI DIRECT SEMIEXCLUSIVE PRODUCTION OF ENERGETIC MESONS SO PHYSICAL REVIEW D LA English DT Article ID EXCLUSIVE PROCESSES; WAVE-FUNCTIONS; SCATTERING; BEHAVIOR; QCD; RESONANCES AB The formation of color-singlet hadrons in hard-scattering processes is governed by process-independent distribution amplitudes. Such amplitudes may be measured in a class of processes we call semiexclusive, where one hadron is formed directly in hard scattering and the other QCD partons hadronize in jets. These processes can be identified experimentally by requiring a large angular or rapidity gap around a directly produced meson. We present cross sections for such processes, and show that experimental results, especially the ratio of charged to neutral K production, are highly sensitive to the hadronic distribution amplitude. We discuss methods and prospects for thus gaining information about hadronic wave functions at present and future colliders. RP HYER, T (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 21 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 147 EP 154 DI 10.1103/PhysRevD.48.147 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900012 ER PT J AU COOPER, F EISENBERG, JM KLUGER, Y MOTTOLA, E SVETITSKY, B AF COOPER, F EISENBERG, JM KLUGER, Y MOTTOLA, E SVETITSKY, B TI PARTICLE-PRODUCTION IN THE CENTRAL RAPIDITY REGION SO PHYSICAL REVIEW D LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; ANTIQUARK PLASMA; ELECTRIC-FIELD; MODEL; OSCILLATIONS AB We study pair production from a strong electric field in boost-invariant coordinates as a simple mode for the central rapidity region of a heavy-ion collision. We derive and solve the renormalized equations for the time evolution of the mean electric field and current of the produced particles, when the field is taken to be a function only of the fluid proper time tau = square-root t2-z2. We find that a relativistic transport theory with a Schwinger source term modified to take Pauli blocking (or Bose enhancement) into account gives a good description of the numerical solution to the field equations. We also compute the renormalized energy-momentum tensor of the produced particles and compare the effective pressure, energy, and entropy density to that expected from hydrodynamic models of energy and momentum flow of the plasma. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP COOPER, F (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Svetitsky, Benjamin/0000-0001-5536-4707 NR 35 TC 94 Z9 94 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 190 EP 208 DI 10.1103/PhysRevD.48.190 PG 19 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900017 ER PT J AU DAWSON, S VALENCIA, G AF DAWSON, S VALENCIA, G TI KL-]MU(+/-)E(-+)NU(NU)OVER-BAR AS A BACKGROUND TO KL-]MU(+/-)E(-+) SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL PERTURBATION-THEORY AB We consider the process K(L) --> mu+/-e-/+nunuBAR at next to leading order in chiral perturbation theory. This process occurs in the standard model at second order in the weak interaction, and constitutes a potential background in searches for new physics through the modes K(L) --> mu+/-e-/+. We find that the same cut, M(mue) > 489 MeV, used to remove the sequential decays K13 --> pi(l2) pushes the B (K(L) --> mu+/-e-/+nunuBAR) to the 10(-23) level, effectively removing it as a background. C1 FERMILAB NATL ACCELERATOR LAB,THEORET PHYS,BATAVIA,IL 60510. RP DAWSON, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 209 EP 211 DI 10.1103/PhysRevD.48.209 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900018 ER PT J AU BITAR, KM DEGRAND, T EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC AF BITAR, KM DEGRAND, T EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC TI SIMPLE HADRONIC MATRIX-ELEMENTS WITH WILSON VALENCE QUARKS AND DYNAMICAL STAGGERED FERMIONS AT 6/G2=5.6 SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM CHROMODYNAMICS; LATTICE QCD; MESON; CONTINUUM; SIMULATION; CONNECTION; CONSTANT AB We have measured some simple matrix elements for pseudoscalar and vector mesons made of Wilson valance quarks and staggered sea quarks at beta=5.6 at sea quark masses am(q)=0.01 and 0.025. Our measurements include the decay constants of pseudoscalars (including f(D)), the wave function at the origin (or decay constant) of vector mesons, and the calculation of quark masses from current algebra. The effects of sea quarks on the simulations are small. We make comparisons to quenched simulations at similar values of the lattice spacing (1/a congruent-to 2 GeV). C1 UNIV COLORADO,BOULDER,CO 80309. INDIANA UNIV,BLOOMINGTON,IN 47405. UNIV ILLINOIS,URBANA,IL 61801. THINKING MACHINES CORP,CAMBRIDGE,MA 02139. WASHINGTON UNIV,ST LOUIS,MO 63130. UNIV CENT FLORIDA,ORLANDO,FL 32816. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV ARIZONA,TUCSON,AZ 85721. UNIV NEW S WALES,KENSINGTON,NSW 2203,AUSTRALIA. RP BITAR, KM (reprint author), FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306, USA. OI Heller, Urs M./0000-0002-2780-5584 NR 29 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 370 EP 387 DI 10.1103/PhysRevD.48.370 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900034 ER PT J AU GUPTA, R PATEL, A SHARPE, SR AF GUPTA, R PATEL, A SHARPE, SR TI I = 2 PION-SCATTERING AMPLITUDE WITH WILSON FERMIONS SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM-FIELD THEORIES; COUPLED LATTICE QCD; VOLUME DEPENDENCE; SYMMETRY-BREAKING; ENERGY-SPECTRUM; STATES; INEQUALITIES AB We present an exploratory calculation of the I = 2 pipi scattering amplitude at threshold using Wilson fermions in the quenched approximation, including all the required contractions. We find good agreement with the predictions of chiral perturbation theory even for pions of mass 560-700 MeV. Within 10% error, we do not see the onset of the bad chiral behavior expected for Wilson fermions. We also derive rigorous inequalities that apply to two-particle correlators and as a consequence show that the interaction in the antisymmetric state of two pions has to be attractive. C1 INDIAN INST SCI,CTR SUPERCOMP EDUC & RES,BANGALORE 560012,KARNATAKA,INDIA. INDIAN INST SCI,CTR THEORET STUDIES,BANGALORE 560012,KARNATAKA,INDIA. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP GUPTA, R (reprint author), LOS ALAMOS NATL LAB,T-8 MS-B285,LOS ALAMOS,NM 87545, USA. RI Patel, Apoorva/F-4359-2010 NR 17 TC 69 Z9 69 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 388 EP 396 DI 10.1103/PhysRevD.48.388 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900035 ER PT J AU ZHU, ZK FENG, DH AF ZHU, ZK FENG, DH TI ANALYTICAL STUDY OF FINITE-TEMPERATURE NON-ABELIAN LATTICE GAUGE-THEORY SO PHYSICAL REVIEW D LA English DT Article ID CONFINEMENT TRANSITIONS AB An effective action for spacelike links is given in this paper. Using this action, we can obtain the effective spin model by the variational cumulant expansion method. The study of the critical coupling for the SU(2) case shows that quite accurate results can be obtained. We expect that this approach may open an avenue for the investigation of the deconfining phase transition for large N(tau) lattices. C1 MIT,CTR THEORET PHYS,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37996. RP ZHU, ZK (reprint author), DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP 397 EP 401 DI 10.1103/PhysRevD.48.397 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900036 ER PT J AU ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS SAMBAMURTI, A STEVENS, A STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J SOLUK, R TURCOT, AS AF ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS SAMBAMURTI, A STEVENS, A STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J SOLUK, R TURCOT, AS TI SEARCH FOR THE DECAYS K+-]PI+NU(NU)OVER-BAR AND K+-]PI+X0 FOR 150 LESS-THAN-MX0-LESS-THAN-250-MEV/C2 SO PHYSICAL REVIEW D LA English DT Note ID RARE KAON DECAYS AB A search for the decays K+ --> pi+nunuBAR and K+ --> pi+X0, where X0 is any weakly interacting neutral particle or system of neutral particles with 150 < M(X0) < 250 MeV/c2, was performed in the pion kinematic region below the K(pi2) (K+ --> pi+pi0) peak. An upper limit on B(K+ --> pi+nunuBAR) is set at 1.7 x 10(-8) (90% C.L.) and B(K+ --> pi+X0) is restricted to the 10(-7) level or lower. Limits are also set for the production of K+ --> pi+nunuBAR through scalar or tensor interactions at 1.8 x 10(-8) and 1.0 x 10(-8) (90% C.L.), respectively. C1 LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545. PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RP ATIYA, MS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Marlow, Daniel/C-9132-2014 NR 18 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 1 PY 1993 VL 48 IS 1 BP R1 EP R4 DI 10.1103/PhysRevD.48.R1 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL159 UT WOS:A1993LL15900001 ER PT J AU ERPENBECK, JJ AF ERPENBECK, JJ TI TRANSPORT-COEFFICIENTS OF HARD-SPHERE MIXTURES .3. DIAMETER RATIO 0.4 AND MASS-RATIO 0.03 AT HIGH FLUID DENSITY SO PHYSICAL REVIEW E LA English DT Article ID MOLECULAR-DYNAMICS CALCULATIONS; VELOCITY-CORRELATION FUNCTIONS; ASYMPTOTIC TIME BEHAVIOR; MODIFIED ENSKOG EQUATION; GREEN-KUBO INTEGRANDS; MONTE-CARLO; MULTICOMPONENT MIXTURES; THERMODYNAMIC PROPERTIES; COMPUTER-SIMULATION; PHASE-SEPARATION AB The equation of state and the transport coefficients of shear viscosity, thermal conductivity, thermal diffusion, and mutal diffusion are estimated for a binary, equimolar mixture of hard spheres having a diameter ratio of 0.4 and a mass ratio of 0.03 at volumes in the range 1.7 V0 to 3 V0 (V0 = 1/2 square-root 2N SIGMA(a)x(a) sigma(a)3, where x(a) are the mole fractions, sigma(a) are the diameters, and N is the number of particles), complementing and, in some cases, improving earlier low-density results through Monte Carlo, molecular-dynamics calculations using the Green-Kubo formulas. Calculations are reported for 108 to 2048 particles, so that both finite-system and, in the case of the transport coefficients, long-time tail corrections can be applied to obtain accurate estimates of the pressure and the transport coefficients in the thermodynamic limit. Corrections of both types are found to be increasingly important at higher densities, for which the pressure is observed to become nonlinear in 1/N over the range covered. The Mansoori-Carnahan-Starling-Leland (MCSL) equation is found to account for the pressure with considerable accuracy for V greater-than-or-equal-to 1.7 V0; the difference between the observed (infinite-system) pressure and the MCSL prediction increases monotonically with density, reaching 0.4% at V = 1.7 V0. For volumes below 2 V0 the pressure in excess of the MCSL prediction is found to ''soften'' slightly in its dependence on the density. The pressure is also compared with the known virial series (B2 and B3) and the difference is fitted to a rational polynomial from which estimates for B4 and B5 are derived. The transport coefficients are compared with the predictions of the revised Enskog theory, evaluated using the MCSL equation of state. The shear viscosity coefficient is found to lie within about 5% of the theory over much of the range of densities, exceeding the Enskog prediction at both high and low densities and rising sharply at the highest densities. The thermal conductivity drops to about 94% of the Enskog value at about 2.5 V0, but the ratio increases at higher densities. The thermal diffusion and mutal diffusion coefficients, relative to the Enskog values, drop monotonically to roughly 0.75 with increasing density. The pressure estimates vary in accuracy from 0.001% to 0.01% with increasing density. The accuracy of the estimates of the transport coefficients similarly ranges from 0.5% to 3.8%. The magnitude of the 1/N corrections to both the pressure and the transport coefficients increase with density, equaling, for example, 0.3% of the 256-particle pressure at V = 1.7 V0. At the same density, the combined finite-system and long-time tail correction for the mutual diffusion is 4.3% of the 256-particle result. RP ERPENBECK, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 47 TC 14 Z9 14 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1993 VL 48 IS 1 BP 223 EP 232 DI 10.1103/PhysRevE.48.223 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LN697 UT WOS:A1993LN69700032 ER PT J AU MANE, SR WENG, WT AF MANE, SR WENG, WT TI MINIMAL NORMAL-FORM METHOD FOR DISCRETE MAPS SO PHYSICAL REVIEW E LA English DT Article ID SYSTEMS AB Normal-form methods for solving nonlinear differential equations are reviewed and the comparative merits of three methods are evaluated. The method of minimal normal forms is then extended to apply to the evaluation of discrete maps of an accelerator or storage ring. Such an extension, as suggested in this paper, is more suited for accelerator-based applications than a formulation utilizing continuous differential equations. A computer code has been generated to implement systematically various normal-form formulations for maps in two-dimensional phase space. Specific examples of quadratic and cubic nonlinear fields were used and solved by the method developed. The minimal normal-form method shown here gives good results using relatively-low-order expansions. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1993 VL 48 IS 1 BP 532 EP 542 DI 10.1103/PhysRevE.48.532 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LN697 UT WOS:A1993LN69700064 ER PT J AU VANSCHAGEN, JPS ALHASSID, Y BACELAR, JC BUSH, B HARAKEH, MN HESSELINK, WHA HOFMANN, HJ KALANTARNAYESTANAKI, N NOORMAN, RF PLOMPEN, AJM STOLK, A SUJKOWSKI, Z VANDERWOUDE, A AF VANSCHAGEN, JPS ALHASSID, Y BACELAR, JC BUSH, B HARAKEH, MN HESSELINK, WHA HOFMANN, HJ KALANTARNAYESTANAKI, N NOORMAN, RF PLOMPEN, AJM STOLK, A SUJKOWSKI, Z VANDERWOUDE, A TI GDR DISSIPATION AND NUCLEAR SHAPE IN HOT FAST-ROTATING DY NUCLEI SO PHYSICS LETTERS B LA English DT Article ID GIANT-DIPOLE-RESONANCE; HIGH-SPIN; FLUCTUATIONS; DECAY AB The statistical gamma-ray decay of the GDR built on excited states in Dy nuclei has been investigated for selected domains of angular momentum up to about 70hBAR and temperatures in the range 1-2 MeV. The GDR strength distributions extracted from the data indicate large average nuclear deformations (beta approximately 0.35) at high angular momentum and average temperatures T greater-than-or-equal-to 1.5 MeV. This experimental observation is supported by results from calculations in which thermal shape fluctuations are taken into account around an oblate equilibrium deformation beta(eq) Although this equilibrium deformation increases with angular momentum, the calculations show rather large and constant average deformations [beta] approximately 0.35. C1 YALE UNIV,CTR THEORET PHYS,SLOANE PHYS LAB,NEW HAVEN,CT 06511. YALE UNIV,WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. KERNFYS VERSNELLER INST,9747 AA GRONINGEN,NETHERLANDS. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. SOLTAN INST NUCL STUDIES,PL-05400 OTWOCK,POLAND. RP VANSCHAGEN, JPS (reprint author), FREE UNIV AMSTERDAM,FAC NAT STERRENKUNDE,DE BOELELAAN 1081,1081 HV AMSTERDAM,NETHERLANDS. RI Kalantar-Nayestanaki, Nasser/A-3582-2016; OI Kalantar-Nayestanaki, Nasser/0000-0002-1033-7200; Bush, Brian/0000-0003-2864-7028 NR 21 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 1 PY 1993 VL 308 IS 3-4 BP 231 EP 236 DI 10.1016/0370-2693(93)91277-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK874 UT WOS:A1993LK87400006 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BOTTERWECK, F BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FANG, G FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BOTTERWECK, F BRAUN, HM BUSZA, W CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FANG, G FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, CW SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI AN INVESTIGATION OF BOSE-EINSTEIN CORRELATIONS IN MUON-NUCLEON INTERACTIONS AT 490-GEV SO PHYSICS LETTERS B LA English DT Article ID PION INTERFEROMETRY; COLLISIONS; PHYSICS; ENERGY AB An investigation of Bose-Einstein correlations amongst like-charged pions produced in muon-nucleon interactions at 490 GeV is presented. On top of a broader enhancement, a steep increase in the correlations at small four-momentum differences between the two pions is observed which may be explained by the contribution from decays of resonances (rho-mesons). A two-dimensional analysis discriminates between two different parametrizations of the Bose-Einstein effect, strongly favoring the Lorentz-invariant parametrization over a parametrization based on a Gaussian source distribution in space and time. C1 UNIV MARYLAND,COLL PK,MD 20742. MIT,CAMBRIDGE,MA 02139. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WASHINGTON,SEATTLE,WA 98195. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. UNIV GESAMTHSCH WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. HARVARD UNIV,CAMBRIDGE,MA 02138. YALE UNIV,NEW HAVEN,CT 06520. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. STANISLAW STASZIC UNIV MIN & MET,PL-30059 KRAKOW,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. NORTHWESTERN UNIV,EVANSTON,IL 60201. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. NR 29 TC 12 Z9 12 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 1 PY 1993 VL 308 IS 3-4 BP 418 EP 424 DI 10.1016/0370-2693(93)91307-9 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK874 UT WOS:A1993LK87400036 ER PT J AU BUSKULIC, D DEBONIS, I DECAMP, D GHEZ, P GOY, C LEES, JP MINARD, MN PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T MAGGI, M MARKOU, C MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PATER, JR PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W VEENHOF, R WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E FOCARDI, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ GREENE, AM HASSARD, JF LIESKE, NM MOUTOUSSI, A NASH, J PATTON, S PAYNE, DG PHILLIPS, MJ SANMARTIN, G SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW JACOBS, K LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GAO, Y GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H EMERY, S KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E MARX, B PEREZ, P RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J SIMOHAND, D VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARTWRIGHT, S COMBLEY, F DAWSON, I THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L BOSISIO, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB SAADI, Y SCHMITT, M SHARMA, V SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G AF BUSKULIC, D DEBONIS, I DECAMP, D GHEZ, P GOY, C LEES, JP MINARD, MN PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T MAGGI, M MARKOU, C MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PATER, JR PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W VEENHOF, R WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E FOCARDI, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ GREENE, AM HASSARD, JF LIESKE, NM MOUTOUSSI, A NASH, J PATTON, S PAYNE, DG PHILLIPS, MJ SANMARTIN, G SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW JACOBS, K LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GAO, Y GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H EMERY, S KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E MARX, B PEREZ, P RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J SIMOHAND, D VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARTWRIGHT, S COMBLEY, F DAWSON, I THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L BOSISIO, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB SAADI, Y SCHMITT, M SHARMA, V SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G TI SEARCH FOR HIGH-MASS PHOTON PAIRS IN E+E--]F(F)OVERBAR-GAMMA-GAMMA (F = E, MU,TAU, NU, Q) AT LEP SO PHYSICS LETTERS B LA English DT Article ID ALEPH AB The result of a search for high mass photon pairs from the processes e+ e- - ffgammagammaBAR (f = e, mu, tau, nu and q) with the ALEPH detector is reported. The result for f = e, mu and tau is to be compared with the observation of 4 events by the L3 Collaboration with invariant masses, M(gammagamma), of the two photons near 60 GeV. From a data sample approximately twice as large taken from 1990 to 1992, 6 events are found with M(gammagamma) distributed between 50 GeV and 72 GeV, while 4.9 events are expected from a QED calculation. There is no evidence for a mass peak; only one event (mu+ mu-gammagamma) at M(gammagamma) = 59.4 +/- 0.2 GeV is compatible with the L3 observation. In addition, for M(gammagamma) > 50 GeV, no event is found for e+e- - qqgammagammaBAR and only one event is found consistent with e+e- --> nunugammagamma; this event has M(gammagamma) = 58.5 +/- 1.9 GeV. High mass photon pair events have also been searched for in gammagamma collisions. This allows one to set an upper limit of 50 MeV for the width of an assumed resonance decaying to photon pairs. C1 UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN. UNIV BARI, INFN, SEZIONE BARI, I-70126 BARI, ITALY. UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, IN2P3, CNRS, PHYS CORPUSCULAIRE LAB, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. DEMOCRITOS NUCL RES CTR, ATHENS, GREECE. ECOLE POLYTECH, IN2P3, CNRS, PHYS & HAUTES ENERGIES LAB, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FLORENCE, DIPARTIMENTO FIS, INFN SEZIONE FIRENZE, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMPUTER COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. INFN, LNF, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY. UNIV PARIS 11, IN2P3, CNRS, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE. UNIV PISA, INFN, SEZIONE PISA, DIPARTIMENTO FIS, I-56010 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND. RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND. CE SACLAY, PAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE. UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. INFN, SEZIONE TRIESTE, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV TURIN, IST COSMO GEOFIS, I-10124 TURIN, ITALY. LBL, BERKELEY, CA 94720 USA. UNIV SASSARI, IST MATEMAT & FIS, I-07100 SASSARI, ITALY. RP BUSKULIC, D (reprint author), IN2P3, CNRS, LAPP, F-74019 ANNECY LE VIEUX, FRANCE. RI Delfino, Manuel/A-1545-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Gregorio, Anna/J-1632-2012; Venturi, Andrea/J-1877-2012; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012 OI Delfino, Manuel/0000-0002-9468-4751; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228 NR 14 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 1 PY 1993 VL 308 IS 3-4 BP 425 EP 434 DI 10.1016/0370-2693(93)91308-A PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK874 UT WOS:A1993LK87400037 ER PT J AU JOHNSON, MB AF JOHNSON, MB TI THE PION-NUCLEUS INTERACTION AT HIGH-ENERGY SO PHYSICS OF ATOMIC NUCLEI LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON FEW-BODY PROBLEMS IN LOW ENERGY PHYSICS CY SEP 22-25, 1992 CL ALMA ATA, KAZAKHSTAN SP KAZAKH ACAD SCI, INST NUCL PHYS, INT CTR YOUNG PHYSICISTS ID RESONANCE PHYSICS; SCATTERING; QCD AB It is argued that pion-nucleus scattering at high energy (above 300 MeV) is likely to be easier to interpret than it has been at lower energies where the DELTA33 resonance dominates. For nuclei as heavy as Ca, the eikonal theory is shown to be an excellent approximation to the full theory for the angular distribution out to the position of the second minimum in the cross section. Areas in nuclear physics where high-energy pions can have impact are mentioned. RP JOHNSON, MB (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD JUL PY 1993 VL 56 IS 7 BP 972 EP 974 PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA LQ805 UT WOS:A1993LQ80500034 ER PT J AU SHAING, KC AF SHAING, KC TI SUPPRESSION OF TURBULENT FLUCTUATIONS IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RADIAL ELECTRIC-FIELD; L-H TRANSITION; POLOIDAL ROTATION; TOROIDAL PLASMAS; EDGE TURBULENCE AB It is shown that the criterion for the suppression of turbulent fluctuations in tokamaks is not simply the shear of the radial electrical field. The shear of the parallel flow must be taken into account. One of the most efficient ways to influence turbulence fluctuations through the shear of the angular frequency is to fix the parallel flow and change the poloidal EXB rotation. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 25 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2122 EP 2124 DI 10.1063/1.860747 PN 1 PG 3 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900021 ER PT J AU RENSINK, ME ALLEN, SL FUTCH, AH HILL, DN PORTER, GD MAHDAVI, MA AF RENSINK, ME ALLEN, SL FUTCH, AH HILL, DN PORTER, GD MAHDAVI, MA TI PARTICLE-TRANSPORT STUDIES FOR SINGLE-NULL DIVERTOR DISCHARGES IN DIII-D SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID D TOKAMAK; CONFINEMENT; REGIME; FLUX AB In this paper an investigation of the particle confinement for beam-heated single-null discharges in the open divertor configuration of Doublet III-D (DIII-D) [E. J. Doyle et al., Phys. Fluids B 3, 2300 (1991)] is described. Results are based on a Monte Carlo neutral transport model with a relatively simple plasma model that utilizes experimental data on density, temperature, and heat flux profiles in the edge plasma. For a typical discharge, it is found that the particle confinement time in the quiescent H-mode phase is only about a factor of 2 larger than during the L-mode phase, an increase comparable to the energy confinement time increase. For both H-mode and L-mode phases the particle confinement time is about a factor of 4 larger than the energy confinement time. It is also found that the core plasma fueling rate is higher in the H mode due to the increased transparency of a thinner scrape-off layer. The longer particle confinement time and the increased fueling rate both contribute to the observed density rise during the quiescent period following the L-H transition. Flux surface-averaged transport modeling of the time evolution for the core plasma density profile during H mode suggests that a strong inward particle pinch is necessary near the separatrix. C1 GEN ATOM CO,SAN DIEGO,CA 92186. RP RENSINK, ME (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 21 TC 28 Z9 28 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2165 EP 2175 DI 10.1063/1.860751 PN 1 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900026 ER PT J AU SYNAKOWSKI, EJ EFTHIMION, PC REWOLDT, G STRATTON, BC TANG, WM GREK, B HILL, KW HULSE, RA JOHNSON, DW KISSICK, MW MANSFIELD, DK MCCUNE, D MIKKELSEN, DR PARK, HK RAMSEY, AT REDI, MH SCOTT, SD TAYLOR, G TIMBERLAKE, J ZARNSTORFF, MC AF SYNAKOWSKI, EJ EFTHIMION, PC REWOLDT, G STRATTON, BC TANG, WM GREK, B HILL, KW HULSE, RA JOHNSON, DW KISSICK, MW MANSFIELD, DK MCCUNE, D MIKKELSEN, DR PARK, HK RAMSEY, AT REDI, MH SCOTT, SD TAYLOR, G TIMBERLAKE, J ZARNSTORFF, MC TI HELIUM, IRON, AND ELECTRON PARTICLE-TRANSPORT AND ENERGY-TRANSPORT STUDIES ON THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EXCHANGE RECOMBINATION SPECTROSCOPY; TFTR TOKAMAK; IMPURITY TRANSPORT; CHARGE-TRANSFER; PLASMAS; CONFINEMENT; COEFFICIENTS; INJECTION; PROFILES; HYDROGEN AB Results from helium, iron, and electron transport studies on the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Nucl. Fusion Res. 26, 11 (1984)] in L-mode and supershot deuterium plasmas with the same toroidal field, plasma current, and neutral beam heating power are presented. They are compared to results from thermal transport analysis based on power balance. Particle diffusivities and thermal conductivities are radially hollow and larger than neoclassical values, except possibly near the magnetic axis. The ion channel dominates over the electron channel in both particle and thermal diffusion. A peaked helium profile, supported by inward convection that is stronger than predicted by neoclassical theory, is measured in the supershot. The helium profile shape is consistent with predictions from quasilinear electrostatic drift-wave theory. While the perturbative particle diffusion coefficients of all three species are similar in the supershot, differences are found in the L mode. Quasilinear theory calculations of the ratios of impurity diffusivities are in good accord with measurements. Theory estimates indicate that the ion heat flux should be larger than the electron heat flux, consistent with power balance analysis. However, theoretical values of the ratio of the ion to electron heat flux can be more than a factor of 3 larger than experimental values. A correlation between helium diffusion and ion thermal transport is observed and has favorable implications for sustained ignition of a tokamak fusion reactor. C1 UNIV WISCONSIN,MADISON,WI 53706. RP SYNAKOWSKI, EJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 45 TC 45 Z9 45 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2215 EP 2228 DI 10.1063/1.860755 PN 1 PG 14 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900031 ER PT J AU LEE, YT LAMOUREUX, M AF LEE, YT LAMOUREUX, M TI EFFECTS OF NON-MAXWELLIAN ELECTRON DISTRIBUTIONS ON CHARGE-STATE POPULATIONS IN LASER-PRODUCED PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STEEP TEMPERATURE-GRADIENTS; INVERSE BREMSSTRAHLUNG; HEAT-TRANSPORT AB The effects of a non-Maxwellian electron distribution on the charge-state populations in a plasma with the distribution characterized by the function f(v)=F(m) exp[-(v/v(m)m] with 2 less-than-or-equal-to m less-than-or-equal-to 5 are investigated. In the underdense region of a laser produced plasma, the parameter m would depend on the electron temperature, electron density, and the average ionization state of the plasma in addition to the optical laser intensity and wavelength. The ion populations are obtained by solving the rate equations in which the coefficients are evaluated by integrating the cross sections over the non-Maxwellian electron distributions The scaling of m with column density and optical laser intensity in laser exploding foils is obtained. The effects of a non-Maxwellian electron distribution on the charge-state populations in both selenium and molybdenum foils, similar to those used to model recent x-ray laser experiments, are calculated. The effects on the dominant populations are found to be small, less than a dozen of percents. C1 UNIV PARIS 11,SPECTROSCOPIE ATOM & ION,F-91405 ORSAY,FRANCE. RP LEE, YT (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 4 Z9 4 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2235 EP 2242 DI 10.1063/1.860757 PN 1 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900033 ER PT J AU BERGER, RL LASINSKI, BF KAISER, TB WILLIAMS, EA LANGDON, AB COHEN, BI AF BERGER, RL LASINSKI, BF KAISER, TB WILLIAMS, EA LANGDON, AB COHEN, BI TI THEORY AND 3-DIMENSIONAL SIMULATION OF LIGHT FILAMENTATION IN LASER-PRODUCED PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INDUCED SPATIAL INCOHERENCE; INSTABILITY SUPPRESSION; BEAM; DISTRIBUTIONS; SCATTERING; EVOLUTION; REDUCTION; EMISSION; TARGETS AB A desire to interpret recent experiments on filamentation with and without beam-smoothing techniques led to the development of a three-dimensional fluid model that includes the effects of nonlocal electron transport and kinetic ion damping of the acoustic waves. The damping of the electron-temperature perturbations that drive thermal filamentation by nonlocal electron conduction, valid in the diffusive limit. is supplemented in the present model by electron Landau damping in the collisionless limit when the wavelength of the perturbation is much less than the electron-ion scattering mean-free path. In this collisionless limit, Landau damping of the ''temperature'' fluctuations makes ponderomotive forces universally more important than thermal forces. Simulations in plasmas of current interest illustrate the relative importance of thermal and ponderomotive forces for strongly modulated laser beams. Although thermal forces may initiate filamentation, the most intense filaments are associated with ponderomotive forces. The present simulations of filamentation model well the density perturbations observed in experiments [Young et al., Phys. Rev. Lett. 61, 2336 (1988)]. In addition, a simple criterion is obtained analytically and supported by simulations for stabilization of filamentation by laser beam-smoothing techniques such as induced spatial incoherence and random phase plates [Eq. (1)]. RP BERGER, RL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 50 TC 113 Z9 117 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2243 EP 2258 DI 10.1063/1.860758 PN 1 PG 16 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900034 ER PT J AU HAMMEL, BA GRISWOLD, D LANDEN, OL PERRY, TS REMINGTON, BA MILLER, PL PEYSER, TA KILKENNY, JD AF HAMMEL, BA GRISWOLD, D LANDEN, OL PERRY, TS REMINGTON, BA MILLER, PL PEYSER, TA KILKENNY, JD TI X-RAY RADIOGRAPHIC MEASUREMENTS OF RADIATION-DRIVEN SHOCK AND INTERFACE MOTION IN SOLID DENSITY MATERIAL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LASER; WAVE AB Time resolved x-ray radiographic measurements at high photon energy (approximately 7 keV) are used to observe radiation-driven shock propagation and interface motion in solid density plastic samples, produced by indirect drive on the Nova laser. Measurements of x-ray transmission through the shock compressed material are used to infer a density of approximately three times solid. In addition, by doping a section of a sample with high-Z material (Br) for radiographic contrast, the shocked particle velocity was measured by observing the motion of the interface between the doped and nondoped materials resulting from acceleration by a shock. RP HAMMEL, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Miller, Paul/E-6880-2013; Perry, Theodore/K-3333-2014 OI Perry, Theodore/0000-0002-8832-2033 NR 18 TC 59 Z9 61 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2259 EP 2264 DI 10.1063/1.860759 PN 1 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900035 ER PT J AU YOUNG, PE AF YOUNG, PE TI CORRELATION BETWEEN BACKSCATTERED 3-OMEGA(0)/2 EMISSION AND STIMULATED BRILLOUIN SCATTERED-LIGHT IN LASER-PRODUCED PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID HARMONIC EMISSION; 3-OMEGA-0/2 EMISSION; DECAY AB Evidence is presented that ion-acoustic waves associated with backscattered laser light are responsible for the observation of the blue-shifted feature in the backscatter direction. Backscattered light near the incident laser frequency, omega0, and near three-halves of the incident laser frequency has been spectrally and temporally resolved. The ratio of intensities of the red-shifted and blue-shifted 3omega0/2 features associated with the two-plasmon decay instability is a function of the incident laser intensity and the laser spot size. The intensity of the blue-shifted 3omega0/2 feature correlates well with the intensity of the backscattered light near omega0. RP YOUNG, PE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 20 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2265 EP 2270 DI 10.1063/1.860760 PN 1 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900036 ER PT J AU KROMMES, JA AF KROMMES, JA TI ADVANCES IN GYROKINETIC FLUCTUATION THEORY - THE GYROKINETIC FLUCTUATION DISSIPATION THEOREM AND DIELECTRIC FUNCTION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PARTICLE SIMULATION; DRIFT INSTABILITIES; EQUATIONS; PLASMAS; TRANSPORT; WAVES AB Thermal-equilibrium fluctuation spectra of finite-beta gyrokinetic (GK) plasmas are calculated by means of a GK fluctuation-dissipation theorem. Agreement is found with the earlier heuristic electrostatic calculations of Krommes et al. [Phys. Fluids 29, 2421 (1986)]. The formulas are interpreted in terms of the concept of a GK vacuum, whose large dielectric permittivity and magnetic permeability embody the shielding effects of the polarization drift and the parallel electric field. The finite-beta quasimode action density N(k) is calculated. This is used to interpret the result of a formal resonance integration over the normal modes in terms of the equipartition law omega(k)N(k) = T/2. RP KROMMES, JA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 50 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2405 EP 2411 DI 10.1063/1.860724 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000009 ER PT J AU TAYLOR, G BELL, MG BIGLARI, H BITTER, M BRETZ, NL BUDNY, R CHEN, L DARROW, D EFTHIMION, PC ERNST, D FREDRICKSON, E FU, GY GREK, B GRISHAM, L HAMMETT, G HOSEA, JC JANOS, A JASSBY, D JOBES, FC JOHNSON, DW JOHNSON, LC MAJESKI, R MANSFIELD, DK MAZZUCATO, E MEDLEY, SS MUELLER, D NAZIKIAN, R OWENS, DK PAUL, S PARK, H PHILLIPS, CK ROGERS, JH SCHILLING, G SCHIVELL, J SCHMIDT, GL STEVENS, JE STRATTON, BC STRACHAN, JD SYNAKOWSKI, E WILSON, JR WONG, KL ZWEBEN, SJ BAYLOR, L BUSH, CE GOLDFINGER, RC HOFFMAN, DJ MURAKAMI, M QUALLS, AL RASMUSSEN, D MACHUZAK, J RIMINI, F CHANG, Z AF TAYLOR, G BELL, MG BIGLARI, H BITTER, M BRETZ, NL BUDNY, R CHEN, L DARROW, D EFTHIMION, PC ERNST, D FREDRICKSON, E FU, GY GREK, B GRISHAM, L HAMMETT, G HOSEA, JC JANOS, A JASSBY, D JOBES, FC JOHNSON, DW JOHNSON, LC MAJESKI, R MANSFIELD, DK MAZZUCATO, E MEDLEY, SS MUELLER, D NAZIKIAN, R OWENS, DK PAUL, S PARK, H PHILLIPS, CK ROGERS, JH SCHILLING, G SCHIVELL, J SCHMIDT, GL STEVENS, JE STRATTON, BC STRACHAN, JD SYNAKOWSKI, E WILSON, JR WONG, KL ZWEBEN, SJ BAYLOR, L BUSH, CE GOLDFINGER, RC HOFFMAN, DJ MURAKAMI, M QUALLS, AL RASMUSSEN, D MACHUZAK, J RIMINI, F CHANG, Z TI ION-CYCLOTRON RANGE OF FREQUENCY HEATING ON THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TFTR; ICRH AB The complete ion cyclotron range of frequency (ICRF) heating system for the Tokamak Fusion Test Reactor (TFTR) [Fusion Tech. 21, 1324 (1992)], consisting of four antennas and six generators designed to deliver 12.5 MW to the TFTR plasma, has now been installed. Recently a series of experiments has been conducted to explore the effect of ICRF heating on the performance of low recycling, supershot plasmas in minority and nonresonant electron heating regimes. The addition of up to 7.4 MW of ICRF power to full size (R approximately 2.6 m, alpha approximately 0.95 m), helium-3 minority, deuterium supershots heated with up to 30 MW of deuterium neutral-beam injection has resulted in a significant increase in core electron temperature (DELTAT(e)=3-4 keV). Simulations of equivalent deuterium-tritium (D-T) supershots predict that such ICRF heating should result in an increase in beta(alpha)(0) approximately 30%. Direct electron heating has been observed and has been found to be in agreement with theory. The ICRF heating has also been coupled to neutral-beam heated plasmas fueled by frozen deuterium pellets. In addition ICRF heated energetic ion tails have been used to simulate fusion alpha particles in high-recycling plasmas. Up to 11.4 MW of ICRF heating has been coupled into a hydrogen minority, high-recycling helium plasma and the first observation of the toroidal Alfven eigenmode (TAE) instability driven by the energetic proton tail has been made in this regime. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. MIT,CAMBRIDGE,MA 02139. JET JOINT UNDERTAKING,ABINGDON,OXON,ENGLAND. UNIV WISCONSIN,MADISON,WI 53706. RP TAYLOR, G (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Hammett, Gregory/D-1365-2011; Ernst, Darin/A-1487-2010; chen, liu/I-2297-2013 OI Hammett, Gregory/0000-0003-1495-6647; Ernst, Darin/0000-0002-9577-2809; NR 15 TC 9 Z9 9 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2437 EP 2444 DI 10.1063/1.860728 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000013 ER PT J AU TANG, WM REWOLDT, G AF TANG, WM REWOLDT, G TI LONG-WAVELENGTH MICROINSTABILITIES IN TOROIDAL PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; ION; INSTABILITY; TRANSPORT; STABILITY; TOKAMAKS; SYSTEMS; MODES AB Realistic kinetic toroidal eigenmode calculations have been carried out to support a proper assessment of the influence of long-wavelength microturbulence on transport in tokamak plasmas. In order to efficiently evaluate large-scale kinetic behavior extending over many rational surfaces, significant improvements have been made to a toroidal finite element code used to analyze the fully two-dimensional (r,theta) mode structures of trapped-ion and toroidal ion temperature gradient (ITG) instabilities. It is found that even at very long wavelengths, these eigenmodes exhibit a strong ballooning character with the associated radial structure relatively insensitive to ion Landau damping at the rational surfaces. In contrast to the long-accepted picture that the radial extent of trapped-ion instabilities is characterized by the ion-gyroradius-scale associated with strong localization between adjacent rational surfaces, present results demonstrate that under realistic conditions, the actual scale is governed by the large-scale variations in the equilibrium gradients. Applications to recent measurements of fluctuation properties in Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Nucl. Fusion Res. (International Atomic Energy Agency, Vienna, 1985), Vol. 1, p. 29] L-mode plasmas indicate that the theoretical trends appear consistent with spectral characteristics as well as rough heuristic estimates of the transport level. Benchmarking calculations in support of the development of a three-dimensional toroidal gyrokinetic code indicate reasonable agreement with respect to both the properties of the eigenfunctions and the magnitude of the eigenvalues during the linear phase of the simulations of toroidal ITG instabilities. RP TANG, WM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 26 TC 37 Z9 37 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2451 EP 2459 DI 10.1063/1.860730 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000015 ER PT J AU MYNICK, HE AF MYNICK, HE TI STOCHASTIC TRANSPORT OF MEV IONS BY LOW-N MAGNETIC PERTURBATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK; TFTR AB Recent progress toward understanding two transport phenomena of importance to fusion reactors is described, in the framework of a theory of the stochastic transport of energetic ions in low-frequency, low-n perturbations. These are the observed enhancement of fusion product loss by magnetohydrodynamic (MHD) perturbations, and a new possible mechanism for ash removal and burn control. Significant features of the theory bearing on both problems are the variety of transport scalings with energy possible from perturbations of differing structure, and the contribution to the transport from perturbing ''grad-B'' drifts, neglected in earlier studies, but that can be dominant for MeV ions. Numerical evidence is presented substantiating these analytic expectations. The transition from above to below the global stochastic threshold, and some remaining disparities between experimental observations and numerical/theoretical results, are discussed. RP MYNICK, HE (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 14 TC 24 Z9 24 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2460 EP 2467 DI 10.1063/1.860731 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000016 ER PT J AU COLCHIN, RJ CAROLAN, PG DUCK, R EDLINGTON, T ERENTS, SK FERREIRA, J FIELDING, SJ GIBSON, K GOODALL, DHJ GRYAZNEVICH, M HENDER, TC HUGILL, J JENKINS, I LI, J MANHOOD, SJ PARHAM, BJ ROBINSON, DC SINGLETON, M SYKES, A TODD, TN TURNER, MF VALOVIC, M WALSH, M WILSON, HR AF COLCHIN, RJ CAROLAN, PG DUCK, R EDLINGTON, T ERENTS, SK FERREIRA, J FIELDING, SJ GIBSON, K GOODALL, DHJ GRYAZNEVICH, M HENDER, TC HUGILL, J JENKINS, I LI, J MANHOOD, SJ PARHAM, BJ ROBINSON, DC SINGLETON, M SYKES, A TODD, TN TURNER, MF VALOVIC, M WALSH, M WILSON, HR TI THE SMALL TIGHT ASPECT RATIO TOKAMAK EXPERIMENT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB Low-aspect-ratio tokamaks offer both the economic advantage of smaller size and a number of physics advantages which are not available at conventional aspect ratio. The Small Tight Aspect Ratio Tokamak (START) [Fusion Technology 1990, edited by B. E. Keen, M. Huguet, and R. Hemsworth (North-Holland, Amsterdam, 1991), Vol. 1, p. 353] was conceived as a first substantial test of tokamak plasma behavior at low aspect ratio. It has achieved plasma currents up to 200 kA, peak densities of approximately 2 X 10(20) m-3 and central electron temperatures of approximately 500 eV at an aspect ratio of 1.3-1.5. Central beta values of approximately 13% have been measured and the volume-averaged beta [beta] can approach the Troyon limit. Plasmas are naturally elongated (kappa less than or similar to 2.0) and are vertically stable without feedback control. Major disruptions have not been observed at low aspect ratios (A less-than-or-equal-to 2.0). C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP COLCHIN, RJ (reprint author), AEA FUS TECHNOL,EURATOM,UKAEA ASSOC,CULHAM LAB,ABINGDON,OXON,ENGLAND. NR 13 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2481 EP 2484 DI 10.1063/1.860732 PN 2 PG 4 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000018 ER PT J AU TSUI, HYW WOOTTON, AJ BELL, JD BENGSTON, RD DIEBOLD, D HARRIS, JH HERSHKOWITZ, N HIDALGO, C INGRAHAM, JC KILPATRICK, SJ LI, GX LIN, H MANOS, DM MEIER, MA MILLER, GM MUNSON, CP PEW, J PRAGER, SC RITZ, CP RUDYJ, A SCHOENBERG, KF SORENSEN, J TANAKA, T UCKAN, T WEBER, PG AF TSUI, HYW WOOTTON, AJ BELL, JD BENGSTON, RD DIEBOLD, D HARRIS, JH HERSHKOWITZ, N HIDALGO, C INGRAHAM, JC KILPATRICK, SJ LI, GX LIN, H MANOS, DM MEIER, MA MILLER, GM MUNSON, CP PEW, J PRAGER, SC RITZ, CP RUDYJ, A SCHOENBERG, KF SORENSEN, J TANAKA, T UCKAN, T WEBER, PG TI A COMPARISON OF EDGE TURBULENCE IN TOKAMAKS, STELLARATORS, AND REVERSED-FIELD PINCHES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; POLOIDAL FLOW GENERATION; TRANSPORT; PLASMA; FLUCTUATIONS; FACILITY; ROTATION; SYSTEM AB Edge equilibrium, turbulence and transport related plasma parameters from the Advanced Toroidal Facility (ATF) [Fusion Technol. 10, 179 (1986)] torsatron, the ZT-40M [Fusion Technol. 8, 1571 (1985)] reversed-field pinch, the Phaedrus-T [Nucl. Fusion 32, 2040 (1992)] tokamak, the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 (1981)], and the Tokamak Fusion Test Reactor (TFTR) [in Plasma Physics and Controlled Nuclear Fusion Research, 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 1, p. 9] have been obtained using a standardized Langmuir probe array and a consistent set of data analysis packages. Additional data from some other devices have also been furnished via private communications and incorporated from published results. Experimental results over a wide range of parameters are compared and the turbulence contribution to edge transport are assessed. Certain physical properties that are relevant to the modeling of edge turbulence are identified: namely, shear decorrelation of turbulence, the role of resistive dissipation and electron parallel thermal conduction, radial mode structure in sheared magnetic field, and electromagnetic contribution to the parallel Ohm's law. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV WISCONSIN,MADISON,WI 53706. CTR INVEST ENERGET MEDIOANBIENTALES & TECNOL,MADRID,SPAIN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. RP TSUI, HYW (reprint author), UNIV TEXAS,CTR FUS RES,AUSTIN,TX 78712, USA. RI Hidalgo, Carlos/H-6109-2015 NR 50 TC 46 Z9 47 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2491 EP 2497 DI 10.1063/1.860734 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000020 ER PT J AU ZAKHAROV, L ROGERS, B MIGLIUOLO, S AF ZAKHAROV, L ROGERS, B MIGLIUOLO, S TI THE THEORY OF THE EARLY NONLINEAR STAGE OF M=1 RECONNECTION IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID = 1 OSCILLATIONS; INTERNAL DISRUPTIONS; KINK INSTABILITY; 4-FIELD MODEL; TFTR TOKAMAK; TEARING MODE; JET TOKAMAK; PLASMAS; COLLAPSE; GROWTH AB The theory of the early nonlinear stage of reconnection, when the plasma central core displacement xi0 is still small with respect to the q = 1 radius r1 but exceeds the characteristic width of the singular layer, is considered. The two-dimensional magnetic geometry of m = 1 reconnection is determined by solving Waelbroeck's equations [Phys. Fluids B 1, 2372 (1989)]. Fast nonlinear exponential growth of the mode in contemporary high-temperature experiments is explained on the basis of the nonlinear two-fluid magnetohydrodynamic theory. It is shown that the stabilization of the reconnecting m = 1 mode by omega*-effects is in qualitative agreement with experimental observations. A nonlinear cancellation of the omega*-stabilization is proposed as explanation of the triggering of the sawtooth crash. C1 MIT,CAMBRIDGE,MA 02139. RP ZAKHAROV, L (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 35 TC 68 Z9 68 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2498 EP 2505 DI 10.1063/1.860735 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000021 ER PT J AU WILGEN, JB MURAKAMI, M HARRIS, JH BIGELOW, TS DORY, RA CARRERAS, BA ACETO, SC BATCHELOR, DB BAYLOR, LR BELL, GL BELL, JD COLCHIN, RJ CRUME, EC DOMINGUEZ, N DUNLAP, JL DYER, GR ENGLAND, AC GANDY, RF GLOWIENKA, JC GOLDFINGER, RC GOULDING, RH HANSON, GR HIDALGO, C HIROE, S HIRSHMAN, SP HORTON, LD HOWE, HC HUTCHINSON, DP ISLER, RC JERNIGAN, TC JI, H KANEKO, H KOVRIZHNYKH, LM KWON, M LANGLEY, RA LEE, DK LIKIN, KM LYON, JF MA, CH MENON, MM MIODUSZEWSKI, PK MOTOJIMA, O OKADA, H PAUL, S QUALLS, AL RASMUSSEN, DA RICHARDS, RK ROME, JA SALTMARSH, MJ SARKSYAN, KA SATO, M SCHWELBERGER, JG SHAING, KC SHATS, MG SHEPARD, TD SIMPKINS, JE THOMAS, CE UCKAN, T VANDERSLUIS, KL WADE, MR WING, WR YAMADA, H ZIELINSKI, JJ AF WILGEN, JB MURAKAMI, M HARRIS, JH BIGELOW, TS DORY, RA CARRERAS, BA ACETO, SC BATCHELOR, DB BAYLOR, LR BELL, GL BELL, JD COLCHIN, RJ CRUME, EC DOMINGUEZ, N DUNLAP, JL DYER, GR ENGLAND, AC GANDY, RF GLOWIENKA, JC GOLDFINGER, RC GOULDING, RH HANSON, GR HIDALGO, C HIROE, S HIRSHMAN, SP HORTON, LD HOWE, HC HUTCHINSON, DP ISLER, RC JERNIGAN, TC JI, H KANEKO, H KOVRIZHNYKH, LM KWON, M LANGLEY, RA LEE, DK LIKIN, KM LYON, JF MA, CH MENON, MM MIODUSZEWSKI, PK MOTOJIMA, O OKADA, H PAUL, S QUALLS, AL RASMUSSEN, DA RICHARDS, RK ROME, JA SALTMARSH, MJ SARKSYAN, KA SATO, M SCHWELBERGER, JG SHAING, KC SHATS, MG SHEPARD, TD SIMPKINS, JE THOMAS, CE UCKAN, T VANDERSLUIS, KL WADE, MR WING, WR YAMADA, H ZIELINSKI, JJ TI FLUCTUATION AND MODULATION TRANSPORT STUDIES IN THE ADVANCED TOROIDAL FACILITY (ATF) TORSATRON SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA-CONFINEMENT; ENERGY CONFINEMENT AB The Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)] has completed experiments focusing on microwave scattering measurements of density fluctuations and transport studies utilizing the modulation of dimensionless parameters. Microwave scattering measurements of electron density fluctuations in the core of low-collisionality electron cyclotron heated (ECH) plasmas show features that might be evidence of trapped electron instabilities. Starting from gyro-Bohm scaling, the additional dependence of confinement on the dimensionless parameters nu* and beta (collisionality and beta) has been investigated by modulating each of these parameters separately, revealing the additional favorable dependence, tau(E) is-proportional-to tau(gB)nu*-0.18beta+0.3. RP WILGEN, JB (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Shats, Michael/A-8981-2011; Hidalgo, Carlos/H-6109-2015; OI Shats, Michael/0000-0003-4725-0587; Isler, Ralph/0000-0002-5368-7200 NR 20 TC 13 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2513 EP 2518 DI 10.1063/1.860737 PN 2 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000023 ER PT J AU KESNER, J MAUEL, ME NAVRATIL, GA SABBAGH, SA BELL, M BUDNY, R BUSH, C FREDRICKSON, E GREK, B JANOS, A JOHNSON, D MANSFIELD, D MCCUNE, D MCGUIRE, K PARK, H RAMSEY, A SYNAKOWSKI, E TAYLOR, G ZARNSTORFF, M BATHA, SH LEVINTON, FM AF KESNER, J MAUEL, ME NAVRATIL, GA SABBAGH, SA BELL, M BUDNY, R BUSH, C FREDRICKSON, E GREK, B JANOS, A JOHNSON, D MANSFIELD, D MCCUNE, D MCGUIRE, K PARK, H RAMSEY, A SYNAKOWSKI, E TAYLOR, G ZARNSTORFF, M BATHA, SH LEVINTON, FM TI HIGH POLOIDAL BETA-LONG-PULSE EXPERIMENTS IN THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LIMIT; INSTABILITIES; CONFINEMENT; DEPENDENCE; TFTR AB Experiments have been performed in the Tokamak Fusion Test Reactor [D. M. Meade et al. in Plasma Physics Controlled Nuclear Fusion Research, 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 1, p. 9] with neutral beam injection of up to 4 sec. duration, which is comparable to the time scale for resistive redistribution of the plasma current profile. These plasmas were created using a rapid decrease of the plasma current which initially created a plasma with enhanced stability and confinement. As the current profile evolved, a significantly reduced beta limit was observed. The high epsilonbeta(p) plasmas had up to 90% of the current driven noninductively which significantly broadened the current profile during the long pulse lengths. These experiments demonstrated that high beta(N) plasmas could not be sustained for times longer than the resistive relaxation of the outer current region which at early times after the current ramp-down carried negative current. At later times in lower beta(N) discharges, beta collapses were sometimes observed as the current profile broadened at beta(N) approximately 1.5. The appearance of disruptions was consistent with the predictions of ideal magnetohydrodynamics (MHD) stability analyses. C1 COLUMBIA UNIV,NEW YORK,NY 10027. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. FUS PHYS & TECHNOL,TORRANCE,CA 90503. RP KESNER, J (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. RI Sabbagh, Steven/C-7142-2011; OI Mauel, Michael/0000-0003-2490-7478 NR 25 TC 7 Z9 7 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2525 EP 2531 DI 10.1063/1.860739 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000025 ER PT J AU FERRON, JR LAO, LL TAYLOR, TS KIM, YB STRAIT, EJ WROBLEWSKI, D AF FERRON, JR LAO, LL TAYLOR, TS KIM, YB STRAIT, EJ WROBLEWSKI, D TI IMPROVED CONFINEMENT AND STABILITY IN THE DIII-D TOKAMAK OBTAINED THROUGH MODIFICATION OF THE CURRENT PROFILE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ENERGY CONFINEMENT; REACTOR; FIELD AB Improvement in both the energy confinement time and the achievable value of normalized beta is obtained by modifying the current density profile from the relatively broad shape obtained in standard tokamak discharges to a more peaked shape. The peaked current profile is produced with either a rapid negative ramp in the total plasma current or a rapid increase in the discharge elongation. Discharges have been obtained with beta(N)=beta/(I/aB)=6% mT/MA simultaneously with total energy confinement time two times the value predicted by L-mode scaling relations. Up to a factor of 1.8 improvement in the normalized thermal energy confinement time, tau(th)/I(p), has been obtained in both L-mode and H-mode discharges. It is shown that the increase in confinement can be attributed to a local decrease in the thermal diffusivity that is correlated with a local increase in the poloidal magnetic field and the magnetic shear. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP FERRON, JR (reprint author), GEN ATOM CO,SAN DIEGO,CA 92138, USA. NR 17 TC 50 Z9 50 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2532 EP 2539 DI 10.1063/1.860740 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000026 ER PT J AU LEVINTON, FM BATHA, SH YAMADA, M ZARNSTORFF, MC AF LEVINTON, FM BATHA, SH YAMADA, M ZARNSTORFF, MC TI Q-PROFILE MEASUREMENTS IN THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID SAWTOOTH OSCILLATIONS; INTERNAL DISRUPTIONS; SAFETY-FACTOR; PLASMA; STABILIZATION; DISCHARGES; SAWTEETH; MODES; TFTR AB The q-profile plays a key role in determining plasma equilibrium and stability in tokamaks. With the development of the motional Stark effect (MSE) diagnostic, accurate q(R,t) profiles have been measured and utilized for equilibrium and stability analysis. A multichannel MSE polarimeter system on the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Fusion 33, 1509 (1991)] has obtained data for several plasma conditions including L-mode, supershot, current ramps, and high beta(p). For sawtoothing discharges on TFTR, it is found that q(0) approximately 0.7, well below one, and remains below one throughout the entire evolution of the sawtooth cycle with an increase in q(0) of less-than-or-equal-to 0.1 after a sawtooth crash. During high beta(p) operation or coinjection of neutral beams on TFTR a significant broadening of the current profile and an increase of q(0) is observed. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP LEVINTON, FM (reprint author), FUS PHYS & TECHNOL INC,3547 VOYAGER ST,TORRANCE,CA 90503, USA. RI Yamada, Masaaki/D-7824-2015 OI Yamada, Masaaki/0000-0003-4996-1649 NR 48 TC 79 Z9 80 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2554 EP 2561 DI 10.1063/1.860743 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000029 ER PT J AU BERNABEI, S BELL, R CHANCE, M CHU, TK CORNELIUSSEN, M DAVIS, W GETTLEFINGER, G GIBNEY, T GREENOUGH, N HATCHER, R HERMANN, H IGNAT, D JARDIN, S KAITA, R KAYE, S KESSEL, C KOZUB, T KUGEL, H LAGIN, L LEBLANC, B MANICKAM, J OKABAYASHI, M OLIVER, H ONO, M PAUL, S PREISCHE, S RONEY, P SAUTHOFF, N SCHWEITZER, S SESNIC, S SUN, Y TAKAHASHI, H TIGHE, W VALEO, E VONGOELER, S VOSS, K MAUEL, M NAVRATIL, G CESARIO, R BATHA, S LEVINTON, F RIMINI, F ASAKURA, N JONES, S KESNER, J LUCKHARDT, S PAOLETTI, F WOSKOW, P ZOLFAGHARI, A SEKI, T BELL, J DUNLAP, J ENGLAND, A GREENWOOD, D HARRIS, J HENKEL, G HIRSCHMAN, S ISLER, R LEE, D BLUSH, L CONN, R DOERNER, R HIROOKA, Y LEHMER, R SCHMITZ, L TYNAN, G AF BERNABEI, S BELL, R CHANCE, M CHU, TK CORNELIUSSEN, M DAVIS, W GETTLEFINGER, G GIBNEY, T GREENOUGH, N HATCHER, R HERMANN, H IGNAT, D JARDIN, S KAITA, R KAYE, S KESSEL, C KOZUB, T KUGEL, H LAGIN, L LEBLANC, B MANICKAM, J OKABAYASHI, M OLIVER, H ONO, M PAUL, S PREISCHE, S RONEY, P SAUTHOFF, N SCHWEITZER, S SESNIC, S SUN, Y TAKAHASHI, H TIGHE, W VALEO, E VONGOELER, S VOSS, K MAUEL, M NAVRATIL, G CESARIO, R BATHA, S LEVINTON, F RIMINI, F ASAKURA, N JONES, S KESNER, J LUCKHARDT, S PAOLETTI, F WOSKOW, P ZOLFAGHARI, A SEKI, T BELL, J DUNLAP, J ENGLAND, A GREENWOOD, D HARRIS, J HENKEL, G HIRSCHMAN, S ISLER, R LEE, D BLUSH, L CONN, R DOERNER, R HIROOKA, Y LEHMER, R SCHMITZ, L TYNAN, G TI EXPERIMENTAL EXPLORATION OF PROFILE CONTROL IN THE PRINCETON BETA-EXPERIMENT-MODIFIED (PBX-M) TOKAMAK SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID CONFINEMENT; TRANSPORT; PLASMA AB The experimental program of the Princeton Beta Experiment-Modified (PBX-M) tokamak [Phys. Fluids B2, 1271 (1990)] is directed toward tailoring plasma profiles to achieve greater stability and confinement and to gain access to the second stability region. Modification of the current density profile has been achieved with lower-hybrid current drive (LHCD), leading to a regime free of global magnetohydrodynamic modes, while raising the value of q(0) above unity. The diffusion of the fast electrons produced by LHCD has been examined using two-dimensional hard x-ray imaging. Ion Bernstein waves (IBW) have been used for ion heating: a preliminary analysis shows that ion heating was spatially localized and in agreement with theoretical calculations. Divertor biasing has modified the electric field inside the last closed surface, resulting in the formation of a transport barrier, which in turn has reduced the threshold power of neutral beam injection (NBI) for H-mode transition by 25%. C1 COLUMBIA UNIV,DEPT APPL PHYS,NEW YORK,NY 10027. CRE FRASCATI,EURATOM,ENEA FUS,I-00044 FRASCATI,ITALY. FUS PHYS & TECHNOL,TORRANCE,CA 90503. JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. JAERI MUKOYAMA,JAPAN ATOM RES INST,NAKA FUS RES ESTAB,NAKA MACHI,IBARAKI,JAPAN. MIT,CAMBRIDGE,MA 02139. NATL INST FUS SCI,CHIKUSA KU,NAGOYA 46401,JAPAN. OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831. UNIV CALIF LOS ANGELES,DEPT PHYS,PLASMA PHYS LAB,LOS ANGELES,CA 90024. RP BERNABEI, S (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,FORRESTAL CAMPUS,POB 451,PRINCETON,NJ 08543, USA. RI Jardin, Stephen/E-9392-2010; OI Davis, William/0000-0003-0666-7247; Isler, Ralph/0000-0002-5368-7200; Mauel, Michael/0000-0003-2490-7478 NR 35 TC 23 Z9 24 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2562 EP 2570 DI 10.1063/1.860744 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000030 ER PT J AU NAGAYAMA, Y YAMADA, M SABBAGH, SA FREDRICKSON, ED MANICKAM, J BELL, M BUDNY, RV CAVALLO, A JANOS, AC MAUEL, ME MCGUIRE, KM NAVRATIL, GA TAYLOR, G AF NAGAYAMA, Y YAMADA, M SABBAGH, SA FREDRICKSON, ED MANICKAM, J BELL, M BUDNY, RV CAVALLO, A JANOS, AC MAUEL, ME MCGUIRE, KM NAVRATIL, GA TAYLOR, G TI INVESTIGATION OF BALLOONING MODES IN HIGH POLOIDAL BETA-PLASMAS IN THE TOKAMAK FUSION TEST REACTOR SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STABILITY; TFTR AB Medium-n (toroidal mode number) instabilities with ballooning characteristics were investigated using x-ray and electron-cyclotron emission (ECE) imaging techniques in the Tokamak Fusion Test Reactor (TFTR) [R. J. Hawryluk et al., Plasma Phys. Controlled Fusion 33, 1509 (1991)]. The poloidal mode numbers were determined by fitting the data to soft x-ray signals simulated with a wave-packet model, and the toroidal mode numbers were determined from the phase difference between the soft x-ray and ECE signals. The modes are identified as ideal ballooning modes from the observation that the identified mode numbers are much higher than that of the usual kink or tearing modes, the mode has a strong ballooning characteristic, the growth rate is consistent with the theoretical prediction, and the equilibrium is theoretically predicted to be marginal to the infinite n ballooning mode. The ballooning mode accompanies a beta collapse which happens near the Troyon limit in TFTR. The ballooning mode has also been observed just before a major disruption in TFTR. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RI Sabbagh, Steven/C-7142-2011; Yamada, Masaaki/D-7824-2015; OI Yamada, Masaaki/0000-0003-4996-1649; Mauel, Michael/0000-0003-2490-7478 NR 23 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2571 EP 2577 DI 10.1063/1.860692 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000031 ER PT J AU RAX, JM FISCH, NJ AF RAX, JM FISCH, NJ TI ULTRAHIGH INTENSITY LASER-PLASMA INTERACTION - A LAGRANGIAN APPROACH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INSTABILITY; PULSES AB A Lagrangian analysis simplifies considerably the description of the ultrahigh intensity regime of laser-plasma interaction, and facilitates the identification of several new and important effects. First, the vacuum figure ''8'' orbit is shown to be unstable, with respect to a stochastic instability leading to collisionless heating. Second, in the generation of plasma wakes using ultrahigh intensity laser pulses, it can be shown that, for long-duration laser pulses, the plasma wake is insignificant, but, through proper phasing of a set of short-duration pulses, a dramatic amplification of the wake amplitude occurs. Third, in the generation of third-harmonic waves using ultrahigh intensity, long-duration laser pulses, it can be seen that a mismatch in the phase velocity limits severely the power conversion, but a conversion efficiency free from saturation might indeed be possible by employing either a density-modulated plasma or an ionized buffer gas. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP RAX, JM (reprint author), CENS,DEPT RECH ETATS CONDENSES ATOMES & MOLEC,F-91191 GIF SUR YVETTE,FRANCE. NR 19 TC 18 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2578 EP 2583 DI 10.1063/1.860693 PN 2 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000032 ER PT J AU REMINGTON, BA WEBER, SV HAAN, SW KILKENNY, JD GLENDINNING, SG WALLACE, RJ GOLDSTEIN, WH WILSON, BG NASH, JK AF REMINGTON, BA WEBER, SV HAAN, SW KILKENNY, JD GLENDINNING, SG WALLACE, RJ GOLDSTEIN, WH WILSON, BG NASH, JK TI LASER-DRIVEN HYDRODYNAMIC INSTABILITY EXPERIMENTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; GROWTH-RATES; TARGETS; FUSION; PLASMA; SIMULATIONS AB An extensive series of experiments has been conducted on the Nova laser to measure hydrodynamic instabilities in planar foils accelerated by x-ray ablation. Single-mode experiments allow a measurement of the fundamental growth rates from the linear well into the nonlinear regime. Two-mode foils give a first direct observation of mode coupling. Surface-finish experiments allow a measurement of the evolution of a broad spectrum of random initial modes. RP REMINGTON, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 34 TC 65 Z9 71 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2589 EP 2595 DI 10.1063/1.860695 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000034 ER PT J AU BATHA, SH BALDIS, HA BRADLEY, KS DRAKE, RP ESTABROOK, K JOHNSTON, TW MONTGOMERY, DS PROCASSINI, RJ AF BATHA, SH BALDIS, HA BRADLEY, KS DRAKE, RP ESTABROOK, K JOHNSTON, TW MONTGOMERY, DS PROCASSINI, RJ TI NEAR-FORWARD SCATTERING OF LASER-LIGHT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STIMULATED RAMAN-SCATTERING; MU-M LASER; PLASMA; BACKWARD; INSTABILITY; TARGETS; GROWTH; MODES AB Near-forward scattering of laser light in a plasma, in regimes relevant to future inertial-confinement-fusion (ICF) experiments, has been investigated experimentally. The intensity scaling of stimulated Raman scattering (SRS) forward scattering at one angle was measured from a low-Z plasma. It was found that the intensity threshold and scaling were consistent with convective theory. Forward SRS saturated at a relatively low intensity. In a second experiment using Ti plasmas, absolutely calibrated, time-resolved stimulated Brillouin scattering (SBS) spectra from up to seven different angles were measured simultaneously. It was found that the angular dependence of the scattered energy was qualitatively consistent with convective theory. The spectra provided. the first evidence of near-forward SBS. Contrary to previous estimates, near-forward SBS was shown to be more efficient than oblique backscattering and may be an important effect for ICF. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. LAWRENCE LIVERMORE NATL LAB,INST PLASMA PHYS RES,LIVERMORE,CA 94551. INRS ENERGIE,VARENNES J3X 1S2,PQ,CANADA. UNIV CALIF DAVIS,DEPT APPL SCI,LIVERMORE,CA 94551. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 34 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2596 EP 2602 DI 10.1063/1.860696 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000035 ER PT J AU WILKS, SC AF WILKS, SC TI SIMULATIONS OF ULTRAINTENSE LASER-PLASMA INTERACTIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RESONANCE-ABSORPTION; CRITICAL SURFACE; PULSES; GENERATION; LIGHT AB The interaction of ultraintense, short pulse lasers with a preformed plasma is investigated using particle-in-cell (PIC) computer simulations. For this interaction regime, the electron motion in the presence of the intense light wave is strongly relativistic. Due to the extremely large light pressure associated with such pulses, a deep depression at the critical surface is formed, which causes the absorption to increase as a function of time. The result is that a substantial amount of the laser energy is absorbed by hot electrons that transport into the overdense plasma. There is also a large inward acceleration of ions. Comparison of the present simulation results with data obtained from a current experiment is also presented. RP WILKS, SC (reprint author), LAWRENCE LIVERMORE NATL LAB,L-472,LIVERMORE,CA 94550, USA. NR 33 TC 109 Z9 112 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2603 EP 2608 DI 10.1063/1.860697 PN 2 PG 6 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000036 ER PT J AU DUBOIS, DF HANSEN, A ROSE, HA RUSSELL, D AF DUBOIS, DF HANSEN, A ROSE, HA RUSSELL, D TI EXCITATION OF STRONG LANGMUIR TURBULENCE IN THE IONOSPHERE - COMPARISON OF THEORY AND OBSERVATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PARAMETRIC-INSTABILITIES; SPECTRUM; COLLAPSE; ARECIBO; WAVES; POWER AB The predictions of models of strong Langmuir turbulence (SLT) are compared with recent space- and time-resolved radar observations of the power spectra of turbulence induced in the ionosphere by powerful high-frequency (HF) waves. Distinct signatures of caviton dynamics, not predicted by the weak turbulence approximation, are seen in the observations. An improved model of the low-frequency fluctuations for equal electron and ion temperatures is presented as well as a discussion of density profile modification by the induced turbulence. C1 UNIV OSLO,ITA,N-0315 OSLO,NORWAY. LODESTAR RES CORP,BOULDER,CO 80301. RP DUBOIS, DF (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B262,LOS ALAMOS,NM 87545, USA. NR 31 TC 36 Z9 36 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2616 EP 2622 DI 10.1063/1.860699 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000038 ER PT J AU GOSLING, JT AF GOSLING, JT TI CORONAL MASS EJECTIONS - THE LINK BETWEEN SOLAR AND GEOMAGNETIC-ACTIVITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID WIND; DISTURBANCES; RECONNECTION; TRANSIENTS; EVENTS AB Coronal mass ejections are spectacular manifestations of solar activity in which 10(+15)-10(+16) g of solar material are propelled outward into interplanetary space. Recent work has demonstrated that these events are the prime link between solar activity and large, nonrecurrent geomagnetic storms, closing a loop in a body of research extending back more than 130 years. RP LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 38 TC 44 Z9 44 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2638 EP 2645 DI 10.1063/1.860701 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000041 ER PT J AU BARNARD, JJ DEADRICK, F FRIEDMAN, A GROTE, DP GRIFFITH, LV KIRBIE, HC NEIL, VK NEWTON, MA PAUL, AC SHARP, WM SHAY, HD BANGERTER, RO FALTENS, A FONG, CG JUDD, DL LEE, EP REGINATO, LL YU, SS GODLOVE, TF AF BARNARD, JJ DEADRICK, F FRIEDMAN, A GROTE, DP GRIFFITH, LV KIRBIE, HC NEIL, VK NEWTON, MA PAUL, AC SHARP, WM SHAY, HD BANGERTER, RO FALTENS, A FONG, CG JUDD, DL LEE, EP REGINATO, LL YU, SS GODLOVE, TF TI RECIRCULATING INDUCTION ACCELERATORS AS DRIVERS FOR HEAVY-ION FUSION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB A two-year study of recirculating induction heavy ion accelerators as low-cost driver for inertial-fusion energy applications was recently completed. The projected cost of a 4 MJ accelerator was estimated to be about $500 M (million) and the efficiency was estimated to be 35%. The principal technology issues include energy recovery of the ramped dipole magnets, which is achieved through use of ringing inductive/capacitive circuits, and high repetition rates of the induction cell pulsers, which is accomplished through arrays of field effect transistor (FET) switches. Principal physics issues identified include minimization of particle loss from interactions with the background gas, and more demanding emittance growth and centroid control requirements associated with the propagation of space-charge-dominated beams around bends and over large path lengths. In addition, instabilities such as the longitudinal resistive instability, beam-breakup instability and betatron-orbit instability were found to be controllable with careful design. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FM TECHNOL INC,FAIRFAX,VA 22302. RP BARNARD, JJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 28 TC 20 Z9 20 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2698 EP 2706 DI 10.1063/1.860708 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000049 ER PT J AU LONDON, RA AF LONDON, RA TI DEVELOPMENT OF COHERENT X-RAY LASERS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB Proposed x-ray laser applications such as interferometry and holography require coherent radiation. The fact that x-ray laser media are short-lived high-temperature plasmas leads to very different coherence properties from those of ordinary lasers. Research aimed at developing theoretical models and experimentally characterizing and improving x-ray laser coherence is discussed. Longitudinal coherence is already sufficient for several applications due to the narrow linewidths. However, transverse coherence is estimated to be poor for most current x-ray lasers. To quantify these estimates and to design better lasers, both wave and geometric optics propagation and coherence theories have been developed. These theories and resulting predictions of the coherence length are presented and compared. Measurements of x-ray laser beam patterns and coherence lengths are presented and compared to detailed theoretical simulations. Designs for more coherent lasers are given. RP LONDON, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 36 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2707 EP 2713 DI 10.1063/1.860709 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000050 ER PT J AU VAHEDI, V BIRDSALL, CK LIEBERMAN, MA DIPESO, G ROGNLIEN, TD AF VAHEDI, V BIRDSALL, CK LIEBERMAN, MA DIPESO, G ROGNLIEN, TD TI VERIFICATION OF FREQUENCY SCALING LAWS FOR CAPACITIVE RADIOFREQUENCY DISCHARGES USING 2-DIMENSIONAL SIMULATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RF GLOW-DISCHARGES; PARTICLE SIMULATIONS; 13.56 MHZ; MODEL; PLASMA; ARGON AB Weakly ionized processing plasmas are studied in two dimensions using a bounded particle-in-cell (PIC) simulation code with a Monte Carlo collision (MCC) package. The MCC package models the collisions between charged and neutral particles, which are needed to obtain a self-sustained plasma and the proper electron and ion energy loss mechanisms. A two-dimensional capacitive radio-frequency (rf) discharge is investigated in detail. Simple frequency scaling laws for predicting the behavior of some plasma parameters are derived and then compared with simulation results, finding good agreements. It is found that as the drive frequency increases, the sheath width decreases, and the bulk plasma becomes more uniform, leading to a reduction of the ion angular spread at the target and an improvement of ion dose uniformity at the driven electrode. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. RP VAHEDI, V (reprint author), UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720, USA. NR 32 TC 134 Z9 134 U1 1 U2 12 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2719 EP 2729 DI 10.1063/1.860711 PN 2 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000052 ER PT J AU MALANEY, RA MATHEWS, GJ AF MALANEY, RA MATHEWS, GJ TI PROBING THE EARLY UNIVERSE - A REVIEW OF PRIMORDIAL NUCLEOSYNTHESIS BEYOND THE STANDARD BIG-BANG SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID HADRON PHASE-TRANSITION; SUPERCONDUCTING COSMIC STRINGS; LITHIUM ISOTOPE RATIO; NEUTRINO MAGNETIC-MOMENT; TEMPERATURE QUANTUM CHROMODYNAMICS; GRAVITINO-INDUCED BARYOGENESIS; LIGHT-ELEMENT NUCLEOSYNTHESIS; BARYON-NUMBER FLUCTUATIONS; DECAYING MASSIVE PARTICLE; NONZERO LEPTON NUMBERS AB The scientific literature is rich with studies of non-standard primordial nucleosynthesis. We review a number of these variants on the simplest standard big bang (SBB) nucleosynthesis model and discuss some of the impact these studies have had on cosmology and particle physics. Primordial nucleosynthesis is one of the earliest probes of the universe, and non-standard nucleosynthesis models allow for an exploration of the range of conditions which might have prevailed during the first few minutes. In particular, nonstandard models often allow for a larger range of conditions to be present in the early universe than those allowed by the SBB while still satisfying observational constraints such as the inferred primordial isotopic abundances and the number of neutrino species derived from recent e+e- collider experiments. By considering alternatives to the SBB we can also determine the model dependence of the constraints imposed on particle physics and cosmology from primordial nucleosynthesis. C1 UNIV TORONTO,CANADIAN INST THEORET ASTROPHYS,TORONTO M5S 1A7,ONTARIO,CANADA. LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,DIV P,LIVERMORE,CA 94550. RP MALANEY, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550, USA. RI Malaney, Robert/F-6588-2012 OI Malaney, Robert/0000-0001-9672-5601 NR 518 TC 151 Z9 151 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD JUL PY 1993 VL 229 IS 4 BP 145 EP 219 DI 10.1016/0370-1573(93)90134-Y PG 75 WC Physics, Multidisciplinary SC Physics GA LP727 UT WOS:A1993LP72700001 ER PT J AU BENESH, C JOHNSON, C AUFDERHEIDE, M ORMAND, E AF BENESH, C JOHNSON, C AUFDERHEIDE, M ORMAND, E TI WITH PHYSICS IN TRANSITION, ISSUES OF SUPPLY-AND-DEMAND MUST BE FACED SO PHYSICS TODAY LA English DT Letter C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CALTECH,PASADENA,CA 91125. RP BENESH, C (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1993 VL 46 IS 7 BP 9 EP 9 DI 10.1063/1.2808953 PG 1 WC Physics, Multidisciplinary SC Physics GA LN088 UT WOS:A1993LN08800001 ER PT J AU DRELL, SD AF DRELL, SD TI SOME THOUGHTS ON THE SSC AND THE MANAGEMENT OF SCIENCE SO PHYSICS TODAY LA English DT Editorial Material RP DRELL, SD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1993 VL 46 IS 7 BP 73 EP 75 DI 10.1063/1.2808973 PG 3 WC Physics, Multidisciplinary SC Physics GA LN088 UT WOS:A1993LN08800020 ER PT J AU KIRKPATRICK, RC AF KIRKPATRICK, RC TI INERTIAL FUSION QUALIFIERS AND QUALMS SO PHYSICS TODAY LA English DT Letter RP KIRKPATRICK, RC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1993 VL 46 IS 7 BP 112 EP 112 DI 10.1063/1.2808989 PG 1 WC Physics, Multidisciplinary SC Physics GA LN088 UT WOS:A1993LN08800023 ER PT J AU LINDL, JD CAMPBELL, EM HOGAN, WJ KULCINSKI, GL MCCRORY, RL BANGERTER, R AF LINDL, JD CAMPBELL, EM HOGAN, WJ KULCINSKI, GL MCCRORY, RL BANGERTER, R TI INERTIAL FUSION QUALIFIERS AND QUALMS - REPLY SO PHYSICS TODAY LA English DT Letter C1 UNIV WISCONSIN,MADISON,WI 53706. UNIV ROCHESTER,ROCHESTER,NY 14627. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LINDL, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1993 VL 46 IS 7 BP 113 EP 113 PG 1 WC Physics, Multidisciplinary SC Physics GA LN088 UT WOS:A1993LN08800025 ER PT J AU MCARTHUR, D MATTHEWS, S QUIGLEY, G AF MCARTHUR, D MATTHEWS, S QUIGLEY, G TI NEWS FROM THE NUCLEAR-PUMPED LASER FOREFRONT SO PHYSICS TODAY LA English DT Letter C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP MCARTHUR, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUL PY 1993 VL 46 IS 7 BP 113 EP 114 DI 10.1063/1.2808990 PG 2 WC Physics, Multidisciplinary SC Physics GA LN088 UT WOS:A1993LN08800026 ER PT J AU BRYAN, JC BURRELL, AK MILLER, MM SMITH, WH BURNS, CJ SATTELBERGER, AP AF BRYAN, JC BURRELL, AK MILLER, MM SMITH, WH BURNS, CJ SATTELBERGER, AP TI SYNTHESIS AND REACTIVITY OF TECHNETIUM(VII) IMIDO COMPLEXES SO POLYHEDRON LA English DT Article ID RAY CRYSTAL-STRUCTURES; MAIN GROUP ELEMENTS; TRANSITION-METALS; MULTIPLE BONDS; TRIS(PHENYLIMIDO) COMPLEXES; ORGANOIMIDO COMPLEXES; PHENYLIMIDO COMPLEX; FUNCTIONAL-GROUP; TERT-BUTYLIMIDO; RHENIUM AB The synthesis, characterization and electrochemistry of a series of new technetium complexes, Tc(NAr)3X and Tc(NAr')3X (X = OSiMe3, alkyl, I), is reported. These complexes are shown to be resistant to reduction and moderately air-sensitive. The siloxy complex Tc(NAr)3(OSiMe3) (1a) reacts with fluoride ion to give the tris(imido)oxo anion [TcO(NAr)3]-. Less sterically hindered M(NAr')3(OSiMe3) complexes react with Ar'NCO in a net [2+2] fashion to give the urylene complexes M(NAr')2(NArC(O)NAr') (OSiMe3) (2a, M = Tc; 2b, M = Re). The X-ray crystal structures of 1a, 2b and Tc(NAr)3I (4a) suggest that the imido ligands moderate their level of electron donation to reflect the electronic requirements of the metal and the ancillary ligands. RP BRYAN, JC (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 41 TC 42 Z9 42 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PD JUL PY 1993 VL 12 IS 14 BP 1769 EP 1777 DI 10.1016/S0277-5387(00)84611-2 PG 9 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA LQ076 UT WOS:A1993LQ07600009 ER PT J AU LYCZKOWSKI, RW GAMWO, IK DOBRAN, F AI, YH CHAO, BT CHEN, MM GIDASPOW, D AF LYCZKOWSKI, RW GAMWO, IK DOBRAN, F AI, YH CHAO, BT CHEN, MM GIDASPOW, D TI VALIDATION OF COMPUTED SOLIDS HYDRODYNAMICS AND PRESSURE OSCILLATIONS IN A BUBBLING ATMOSPHERIC FLUIDIZED-BED SO POWDER TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP ON ATTRITION AND WEAR IN POWDER TECHNOLOGY CY OCT, 1992 CL UTRECHT, NETHERLANDS ID EROSION AB The ensemble- and time-averaged solids velocity field and bed dynamics in the form of pressure oscillations taken in the atmospheric 'thin' (3.81 cm x 40 cm) bubbling fluidized bed at the University of Illinois at Urbana-Champaign (UIUC) have been analyzed using Argonne National Laboratory's hydrodynamic model FLUFIX implemented on a Cray X-MP/18 supercomputer. The fluidized bed contained a simulated triangular pitch tube array consisting of five, round, 5.08-cm diameter cylinders. The bed material consisted of soda lime glass beads having a narrow size range averaging 460 mum in diameter. The fluidizing air was introduced at 39 cm s-1. Generally correct solids motion is predicted by the FLUFIX computer program. The uncertainties in the UIUC solids motion data varied greatly from location to location; hence, a sensitivity analysis was performed by varying the inlet fluidizing-gas velocity distribution. A convergence study was performed by varying (1) the size of the mesh used to approximate the obstacles and (2) the accuracy of the numerical solution. Essential grid independence is demonstrated for time-averaged axial solids velocities and porosities for the tubes modeled as 2 x 2 and 4 x 4 squares and a very tight convergence. Good agreement is obtained for the power spectra of the absolute pressure fluctuations using the fast Fourier transform technique. The computed and experimental major frequencies lie in the relatively narrow range of 2-3 Hz. C1 UNIV ILLINOIS,DEPT MECH & IND ENGN,URBANA,IL 61801. IIT,DEPT CHEM ENGN,CHICAGO,IL 60616. RP LYCZKOWSKI, RW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 17 TC 38 Z9 39 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD JUL PY 1993 VL 76 IS 1 BP 65 EP 77 DI 10.1016/0032-5910(93)80042-9 PG 13 WC Engineering, Chemical SC Engineering GA LP407 UT WOS:A1993LP40700009 ER PT J AU RABAS, TJ AF RABAS, TJ TI ENHANCED SURFACE CONDENSERS IMPROVE HEAT RATES SO POWER ENGINEERING LA English DT Article RP RABAS, TJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PENNWELL PUBL CO ENERGY GROUP PI TULSA PA 1421 S SHERIDAN RD PO BOX 1260, TULSA, OK 74101 SN 0032-5961 J9 POWER ENG JI Power Eng. PD JUL PY 1993 VL 97 IS 7 BP 36 EP 38 PG 3 WC Energy & Fuels; Engineering, Multidisciplinary SC Energy & Fuels; Engineering GA LM875 UT WOS:A1993LM87500008 ER PT J AU ULLRICH, SJ SAKAGUCHI, K LEESMILLER, SP FISCELLA, M MERCER, WE ANDERSON, CW APPELLA, E AF ULLRICH, SJ SAKAGUCHI, K LEESMILLER, SP FISCELLA, M MERCER, WE ANDERSON, CW APPELLA, E TI PHOSPHORYLATION AT SER-15 AND SER-392 IN MUTANT P53-MOLECULES FROM HUMAN TUMORS IS ALTERED COMPARED TO WILD-TYPE P53 SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID CASEIN KINASE-II; LARGE-T-ANTIGEN; PROTEIN-KINASE; CELL-LINES; RAT-CELLS; ASSOCIATION; MUTATIONS; SEQUENCE; GROWTH; SUPPRESSION AB The product of the p53 gene suppresses cell growth and plays a critical role in suppressing development of human tumors. p53 protein binds DNA, activates transcription, and can be phosphorylated at N- and C-terminal sites. Previously, wild-type p53 was shown to be hyperphosphorylated compared to mutant p53 during p53-mediated growth arrest in vivo. Here we show that Ser-15 and Ser-9 in the N-terminal transactivation domain of wild-type human p53 are phosphorylated in vivo in cells derived from the human glioblastoma line T98G. In [Ile237]p53 and [Ala143]p53, two natural p53 mutants from human tumors that are defective for activation of transcription, phosphorylation at Ser-15 was reduced and phosphorylation at Ser-392 was increased compared to wild-type p53. No change was observed at Ser-9. [His273]p53, a third mutant, had a phosphorylation state similar to that of wild-type p53. We suggest that phosphorylation of Ser-15 may depend on the ability of p53 to adopt a wild-type conformation and may contribute to p53's ability to block cell growth. C1 AMER RED CROSS,JEROME H HOLLAND LAB,ROCKVILLE,MD 20855. THOMAS JEFFERSON UNIV,JEFFERSON CANC INST,DEPT MICROBIOL & IMMUNOL,PHILADELPHIA,PA 19107. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP ULLRICH, SJ (reprint author), NCI,CELL BIOL LAB,BETHESDA,MD 20892, USA. NR 56 TC 85 Z9 85 U1 0 U2 4 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 1 PY 1993 VL 90 IS 13 BP 5954 EP 5958 DI 10.1073/pnas.90.13.5954 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM035 UT WOS:A1993LM03500017 PM 8327466 ER PT J AU BRECHER, G BOOKSTEIN, N REDFEARN, W NECAS, E PALLAVICINI, MG CRONKITE, EP AF BRECHER, G BOOKSTEIN, N REDFEARN, W NECAS, E PALLAVICINI, MG CRONKITE, EP TI SELF-RENEWAL OF THE LONG-TERM REPOPULATING STEM-CELL SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE HEMATOPOIESIS; MARROW TRANSPLANTATION; COMPETITIVE REPOPULATION; COLONY-FORMING UNITS, SPLEEN; IRRADIATION AB Self-renewal implies maintenance of all attributes of the original in the offspring and is considered characteristic of the hemopoietic stem cells. Yet, it has been questioned whether one of the most primitive hemopoietic stem cells, the long-term repopulating cell (LTRC), has that capacity. The present experiments demonstrate that single LTRCs can repopulate the lymphohemopoietic system of a lethally irradiated mouse and that the progeny of a single LTRC in a primary recipient again contains LTRCs capable of repopulating lethally irradiated secondary recipients. The transfusion of very small numbers of marrow cells (10,000-20,000 cells containing one or no LTRCs) unexpectedly provided insight into competitive marrow repopulation. At these low levels of stem cells, irradiated host stem cells or their progeny competed successfully with unirradiated donor cells. This parallels the known reemergence and marrow repopulation by host cells when the number of nonirradiated donor stem cells is reduced by serial transplantation. C1 UNIV CALIF BERKELEY,PROGRAM BIOSTAT,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,DEPT MED,DIV MOLEC CYTOMETRY,SAN FRANCISCO,CA 94143. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BRECHER, G (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 21 TC 28 Z9 28 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 1 PY 1993 VL 90 IS 13 BP 6028 EP 6031 DI 10.1073/pnas.90.13.6028 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM035 UT WOS:A1993LM03500032 PM 8327479 ER PT J AU ONEILL, TE SMITH, JG BRADBURY, EM AF ONEILL, TE SMITH, JG BRADBURY, EM TI HISTONE OCTAMER DISSOCIATION IS NOT REQUIRED FOR TRANSCRIPT ELONGATION THROUGH ARRAYS OF NUCLEOSOME CORES BY PHAGE T7 RNA-POLYMERASE IN-VITRO SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE RNA SYNTHESIS; 5S RNA-ENCODING DNA; CHROMATIN; DIMETHYL SUBERIMIDATE ID SIMIAN VIRUS 40; CHROMATIN; DNA; MODEL; DISPLACEMENT; DISSOLUTION; INITIATION; SEQUENCES; INHIBIT; LINKING AB We have examined whether dissociation of the histone octamer is required for elongation of RNA transcripts through arrays of nucleosome cores in vitro. Control or dimethyl suberimidate-crosslinked histone octamers were reconstituted onto supercoiled, closed circular pT207-18 DNA, which contains tandemly repeated 207-base-pair (bp) 5S rDNA nucleosome positioning sequences inserted between the T7 and SP6 transcription promoters of pGEM-3Z. Double label transcription experiments showed that there was little or no effect of extensive crosslinking of the histone octamers on transcription initiation and elongation by T7 RNA polymerase in vitro. Continuous regularly spaced linear arrays of either crosslinked or control nucleosome cores were obtained by digesting reconstituted nucleosomal pT207-18 templates with Dra I, a site that is protected from digestion by the presence of positioned nucleosome cores in the 207-bp sequence. After in vitro transcription with T7 RNA polymerase, an RNA ladder with 207-nucleotide spacing was obtained from templates reconstituted both with crosslinked and with control histone octamers, demonstrating clearly that neither partial nor complete dissociation of the histone octamer is essential for transcription elongation through arrays of nucleosome cores in vitro. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. FU NIGMS NIH HHS [GM 26901] NR 33 TC 34 Z9 34 U1 1 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 1 PY 1993 VL 90 IS 13 BP 6203 EP 6207 DI 10.1073/pnas.90.13.6203 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM035 UT WOS:A1993LM03500068 PM 8327500 ER PT J AU SCHREUDER, HA KNIGHT, S CURMI, PMG ANDERSSON, I CASCIO, D SWEET, RM BRANDEN, CI EISENBERG, D AF SCHREUDER, HA KNIGHT, S CURMI, PMG ANDERSSON, I CASCIO, D SWEET, RM BRANDEN, CI EISENBERG, D TI CRYSTAL-STRUCTURE OF ACTIVATED TOBACCO RUBISCO COMPLEXED WITH THE REACTION-INTERMEDIATE ANALOG 2-CARBOXY-ARABINITOL 1,5-BISPHOSPHATE SO PROTEIN SCIENCE LA English DT Article DE CABP; DISULFIDE LINKS; PHOTOSYNTHESIS; PROTEIN CRYSTALLOGRAPHY; RUBISCO ID RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE-OXYGENASE; RIBULOSE-BISPHOSPHATE CARBOXYLASE; 3-DIMENSIONAL STRUCTURE; PROTEIN STRUCTURES; SMALL SUBUNIT; REFINEMENT; RESOLUTION; SITE; DIFFRACTION; MECHANISM AB The crystal structure of activated tobacco rubisco, complexed with the reaction-intermediate analogue 2-carboxy-arabinitol 1,5-bisphosphate (CABP) has been determined by molecular replacement, using the structure of activated spinach rubisco (Knight, S., Andersson, I., & Branden, C.-I., 1990, J. Mol. Biol. 215, 113-160) as a model. The R-factor after refinement is 21.0% for 57,855 reflections between 9.0 and 2.7 angstrom resolution. The local fourfold axis of the rubisco hexadecamer coincides with a crystallographic twofold axis. The result is that the asymmetric unit of the crystals contains half of the L8S8 complex (molecular mass 280 kDa in the asymmetric unit). The activated form of tobacco rubisco is very similar to the activated form of spinach rubisco. The root mean square difference is 0.4 angstrom for 587 equivalent C(alpha) atoms. Analysis of mutations between tobacco and spinach rubisco revealed that the vast majority of mutations concerned exposed residues. Only 7 buried residues were found to be mutated versus 54 residues at or near the surface of the protein. The crystal structure suggests that the Cys 247-Cys 247 and Cys 449-Cys 459 pairs are linked via disulfide bridges. This pattern of disulfide links differs from the pattern of disulfide links observed in crystals of unactivated tobacco rubisco (Curmi, P.M.G., et al., 1992, J. Biol. Chem. 267, 16980-16989) and is similar to the pattern observed for activated spinach tobacco. C1 UNIV CALIF LOS ANGELES,INST MOLEC BIOL,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. SWEDISH UNIV AGR SCI,UPPSALA BIOMED CTR,DEPT MOLEC BIOL,S-75124 UPPSALA,SWEDEN. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Knight, Stefan/D-4315-2015; Curmi, Paul/G-7185-2011; OI Curmi, Paul/0000-0001-5762-7638; Schreuder, Herman/0000-0003-2249-2782 NR 44 TC 51 Z9 51 U1 1 U2 7 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD JUL PY 1993 VL 2 IS 7 BP 1136 EP 1146 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LJ929 UT WOS:A1993LJ92900008 PM 8358296 ER PT J AU FORMAN, SL SMITH, RP HACKETT, WR TULLIS, JA MCDANIEL, PA AF FORMAN, SL SMITH, RP HACKETT, WR TULLIS, JA MCDANIEL, PA TI TIMING OF LATE QUATERNARY GLACIATIONS IN THE WESTERN UNITED-STATES BASED ON THE AGE OF LOESS ON THE EASTERN SNAKE RIVER PLAIN, IDAHO SO QUATERNARY RESEARCH LA English DT Article ID LAVA FLOWS; PLEISTOCENE; CHRONOLOGY; LAKE; BASIN; DEGLACIATION; YELLOWSTONE; MONTANA; NEVADA; CANYON C1 OHIO STATE UNIV, DEPT GEOL SCI, COLUMBUS, OH 43210 USA. EG&G IDAHO INC, IDAHO NATL ENGN LAB, IDAHO FALLS, ID 83415 USA. UNIV IDAHO, DIV SOIL SCI, MOSCOW, ID 83843 USA. RP OHIO STATE UNIV, BYRD POLAR RES CTR, COLUMBUS, OH 43210 USA. RI McDaniel, Paul/A-8954-2009 NR 34 TC 20 Z9 20 U1 0 U2 2 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0033-5894 EI 1096-0287 J9 QUATERNARY RES JI Quat. Res. PD JUL PY 1993 VL 40 IS 1 BP 30 EP 37 DI 10.1006/qres.1993.1053 PG 8 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA LL153 UT WOS:A1993LL15300004 ER PT J AU AHMED, FE AF AHMED, FE TI DIFFERENT RATES OF ULTRAVIOLET-INDUCED DNA-DAMAGE IN THE EPIDERMIS AND DERMIS OF A PLATYFISH MODEL FOR CARCINOGENESIS SO RADIATION AND ENVIRONMENTAL BIOPHYSICS LA English DT Article ID INDUCED SINGLE-STRAND; PYRIMIDINE DIMERS; HUMAN-CELLS; GEL-ELECTROPHORESIS; ACTION SPECTRA; SKIN CANCER; SUN LAMP; RADIATION; PHOTOPRODUCTS; XIPHOPHORUS AB The purpose of this study was to compare fluence-response relationships for the production of cyclobutane pyrimidine dimers in epidermal or dermal DNA of platyfish Xiphophorus hybrids irradiated with UVB, and to determine photoreactivation from black light on dimers produced in situ. This was accomplished by quantitative gel electrophoresis of unlabeled DNA following extraction of the DNA and treatment with an enzyme specific for the detection of pyrimidine dimers. The dermis was the target tissue for UV-induced DNA damage in Xiphophorus hybrid fish skin. Shapes of dimer-fluence response data following filtered sunlamp irradiation (lambda > 290 nm) or monochromatic wavelength 302 nm in the epidermis or dermis were different. In the epidermis there was an initial steep upward slope followed by a plateau, whereas in the dermis a linear relationship was observed. The final values of dimers at the high doses were, however, nearly equal in the epidermis and dermis exposed to either radiation. These differences in fluence-response relationships are probably attributable to the intertwining of the epidermis and to the shielding effect of the epidermal layer, with scales leading to a heterogenous population of cells which are exposed to different UV doses. Photoreversal of dimers was readily observed by black light irradiation in both epidermis and dermis irradiated with either lambda > 290 nm or 302 nm. RP AHMED, FE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 50 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-634X J9 RADIAT ENVIRON BIOPH JI Radiat. Environ. Biophys. PD JUL PY 1993 VL 32 IS 3 BP 259 EP 270 DI 10.1007/BF01209775 PG 12 WC Biology; Biophysics; Environmental Sciences; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Environmental Sciences & Ecology; Radiology, Nuclear Medicine & Medical Imaging GA LW507 UT WOS:A1993LW50700007 PM 8234656 ER PT J AU MASSEY, RS AF MASSEY, RS TI IMPULSE-RESPONSE FUNCTION FOR A TRANSIONOSPHERIC SIGNAL THROUGH A GAUSSIAN FILTER SO RADIO SCIENCE LA English DT Article AB This short communique presents calculations of the output of a Gaussian filter to an electromagnetic impulse that has propagated through a nonmagnetized ionosphere. The rather simple result is interpreted on a physical basis. Useful expressions for the peak power and for the optimum bandwidth are obtained. RP MASSEY, RS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 1 TC 4 Z9 4 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1993 VL 28 IS 4 BP 643 EP 647 DI 10.1029/93RS00416 PG 5 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA LR260 UT WOS:A1993LR26000018 ER PT J AU COMBS, SK AF COMBS, SK TI PELLET INJECTION TECHNOLOGY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Review ID PLASMA FUELING APPLICATIONS; LIGHT GAS GUN; 2-STAGE PNEUMATIC GUN; JOINT EUROPEAN TORUS; FUSION TEST REACTOR; HYDROGEN PELLETS; ARC ARMATURE; HIGH SPEEDS; PIPE GUN; RAILGUN AB During the last 10 to 15 years, significant progress has been made worldwide in the area of pellet injection technology. This specialized field of research originated as a possible solution to the problem of depositing atoms of fuel deep within magnetically confined, hot plasmas for refueling of fusion power reactors. Using pellet injection systems, frozen macroscopic (millimeter-size) pellets composed of the isotopes of hydrogen are formed, accelerated, and transported to the plasma for fueling. The process and benefits of plasma fueling by this approach have been demonstrated conclusively on a number of toroidal magnetic confinement configurations; consequently, pellet injection is the leading technology for deep fueling of magnetically confined plasmas for controlled thermonuclear fusion research. Hydrogen pellet injection devices operate at very low temperatures ( congruent-to 10 K) at which solid hydrogen ice can be formed and sustained. Most injectors use conventional pneumatic (light gas gun) or centrifuge (mechanical) acceleration concepts to inject hydrogen or deuterium pellets at speeds of congruent-to 1-2 km/s. Pellet injectors that can operate at quasi-steady state (pellet delivery rates of 1-40 Hz) have been developed for long-pulse fueling. The design and operation of injectors with the heaviest hydrogen isotope, tritium, offer some special problems because of tritium's radioactivity. To address these problems, a proof-of-principle experiment was carried out in which tritium pellets were formed and accelerated to speeds of 1.4 km/s. Tritium pellet injection is scheduled on major fusion research devices within the next few years. Several advanced accelerator concepts are under development to increase the pellet velocity. One of these is the two-stage light gas gun, for which speeds of slightly over 4 km/s have already been reported in laboratory experiments with deuterium ice. A few two-stage pneumatic systems (single-shot) have recently been installed on tokamak experiments. This article reviews the equipment and instruments that have been developed for pellet injection with emphasis on recent advances. Prospects for future development are addressed, as are possible applications of this technology to other areas of research. RP COMBS, SK (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 162 TC 86 Z9 86 U1 4 U2 13 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1679 EP 1698 DI 10.1063/1.1143995 PG 20 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100001 ER PT J AU WENZEL, KW LI, CK PETRASSO, RD LO, DH BAUTZ, MW RICKER, GR HSIEH, E AF WENZEL, KW LI, CK PETRASSO, RD LO, DH BAUTZ, MW RICKER, GR HSIEH, E TI RESPONSE OF X-UV PHOTODIODES TO 1.5-17.5 KEV X-RAYS AND MEV ALPHA-PARTICLES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB The absolute x-ray response of three X-UV photodiodes was measured over an energy range of 1.5-17.5 keV so that they could be used to calibrate x-ray imaging systems for the ASCA satellite mission. An intense electron-beam x-ray generator was used to test both the dc and ac x-ray response at 1.5, 4.5, 8.0, and 17.5 keV, and an 55Fe source was used to examine one of the photodiodes at 5.9 keV. The x-ray response was determined by comparing the X-UV diode signal to that of a previously calibrated silicon surface barrier diode (SBD). The X-UV detector response was similar to the SBD response at low energies ( 1. 5 and 4.5 keV). At 8 keV, the X-UV detectors exhibited about 70% of the SBD response, and at 17.5 keV, about 50%. This result is surprising, because the X-UV diodes actually have a greater silicon thickness than the SBD. In contrast to our findings for SBDs in the past, this implies that not the entire physical volume of these detectors comprises the active volume. The X-UV detector x-ray response was also examined as a function of the applied bias voltage. No significant bias voltage dependence of the x-ray signal was found, which indicates that the depletion layer thickness does not determine the active volume either. However, the detector noise was found to decrease substantially as the applied bias was raised from zero to a few volts. Response of these detectors, operated in pulse mode, to Ra-226 alpha particles indicated large charge carrier recombination in the bulk silicon. This feature renders these detectors unsuitable for most charged-particle spectroscopy applications. C1 MIT,CTR SPACE RES,CAMBRIDGE,MA 02139. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WENZEL, KW (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 22 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1723 EP 1733 DI 10.1063/1.1144000 PG 11 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100006 ER PT J AU WATT, RG AF WATT, RG TI ND - GLASS-LASER CONTROL-SYSTEM USING INTELLIGENT CAMAC CRATE CONTROLLERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Trident, a TW class Nd:glass laser system has been constructed in the Inertial Confinement Fusion (ICF) Program at Los Alamos National Laboratory for use in x-radiographic imaging of targets and for diagnostic development in support of the ICF program. The laser utilizes intelligent CAMAC crate controllers to provide rapid time response during the charge and fire cycle, while allowing use of an inexpensive desktop computer for the operations station. Operator setup of the laser configuration before a shot and data collection after a shot are performed by the desktop computer, while time critical tasks are handled by the local intelligence. The control system architecture and details of the local control program will be discussed. RP WATT, RG (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 6 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1770 EP 1774 DI 10.1063/1.1144008 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100014 ER PT J AU GRAVES, RS MCELROY, DL KOLLIE, TG AF GRAVES, RS MCELROY, DL KOLLIE, TG TI EVALUATION OF A COMMERCIAL, COMPUTER-OPERATED HEAT-FLOW METER APPARATUS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A Holometrix, Inc., R-Matic model R-41 Heat Flow Meter Apparatus (HFMA) is evaluated by measurements on homogeneous materials and anisotropic composite materials. The former class of materials includes: foams, calcium silicate boards, fiberglass batts, and loose-fill fiberglass. Materials in the latter class are polystyrene with gas-filled panels and batts with powder-filled evacuated panels. Thermal models of the anisotropic composite materials allow design of composite test specimens and help in the interpretation of test results by computation of apparent thermal conductivities (k). The HFMA includes a dedicated computer for test control, data acquisition, and data analysis. Thus, the computer helps obtain the conditions needed to conduct accurate and repeatable steady-state tests to meet ASTM C 518 with minimum operator involvement. The k values from this HFMA and three other HFMAs (model R-20 and R-21 units) exhibit imprecisions of 2.2% (two standard deviations) for specimens of foam insulation. Such performance requires proper calibrations of good quality heat flux transducers and use of correct thermocouple thermometry practices. For six lots of fiberglass batt insulation, this HFMA and a HFMA model R-21 yield k values as a function of density with two standard deviations of 4.5%. Test results from this HFMA for three specimens of loose-fill fiberglass insulation provide k values as a function of density with two standard deviations of 5.1%. Because these levels of imprecision (2.2%-5. 1%) include material differences, they illustrate the limits of error of the model R-41 HFMA. RP GRAVES, RS (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 31 TC 1 Z9 1 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1961 EP 1970 DI 10.1063/1.1143983 PG 10 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100045 ER PT J AU HAVSTAD, MA MCLEAN, W SELF, SA AF HAVSTAD, MA MCLEAN, W SELF, SA TI APPARATUS FOR THE MEASUREMENT OF THE OPTICAL-CONSTANTS AND THERMAL RADIATIVE PROPERTIES OF PURE LIQUID-METALS FROM 0.4 TO 10 MU-M SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Measurements of the optical constants and thermal radiative properties of high-temperature solid tungsten and molten aluminum have been made using a new instrument that includes two independent optical systems and surface control and, analysis capability. The two optical systems, one for measuring the complex index of refraction by ellipsometry, the other for measuring the normal spectral emissivity by direct comparison to an integral blackbody cavity, operate over the wavelength range 0.4-10 mum with sample temperatures between 940 and 1630 K. The surface science capabilities of the instrument permit the preparation of high-purity samples of known composition in situ. The apparatus includes two 5-keV argon-ion sputter guns, an ultrahigh vacuum pumping system, and an Auger spectrometer. The two sputter guns allow surface cleaning to occur while optical measurements are being made, or while Auger spectroscopy is determining the surface composition of solid or liquid samples. The ellipsometric optical system uses a novel radiation source (a carbon composite element), refractive optics (calcium fluoride), interference filters for spectral selection, and both calcite and wire grid polarizers to cover the extended wavelength range. The system for measuring the normal spectral emissivity uses reflective optics and an integral blackbody cavity that is located in the wall of the crucible holding the liquid sample. The use of two measurement techniques gives independent determinations of the normal spectral emissivity and thus allows reliable estimation of experimental errors. C1 STANFORD UNIV,DEPT MECH ENGN,STANFORD,CA 94305. RP HAVSTAD, MA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 24 TC 8 Z9 8 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1971 EP 1978 DI 10.1063/1.1143984 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100046 ER PT J AU PALMER, DA BEGUN, GM WARD, FH AF PALMER, DA BEGUN, GM WARD, FH TI A MICRO-RAMAN CELL FOR STUDYING AQUEOUS-SOLUTIONS AT HIGH-TEMPERATURES AND PRESSURES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SPECTROSCOPIC INVESTIGATIONS; ELEVATED-TEMPERATURES; SODIUM-CHLORIDE; EQUILIBRIUM; 300-DEGREES-C; 25-DEGREES-C; HYDROLYSIS; SPECTRA AB The wetted surfaces of the high-temperature, high-pressure Raman cell (400-degrees-C and 1 kbar) were constructed of inert materials (i.e., sapphire or quartz and platinum with gold seals) and designed to allow spectroscopic measurements to be made with small volumes ( < 0. 5 cm3 at temperature) of corrosive solutions. This design permits solution to be forced slowly through the cell at experimental temperatures and pressures for cases where the solute may be unstable thermally over prolonged periods of time. The entire pressure-generating equipment, temperature controller and readout, solution separation vessels, and cell can be mounted on a cart for convenient transport to various laboratories. Raman spectra of bichromate/dichromate solutions were obtained from ambient conditions to 300-degrees-C and 1 kbar in order to test the capabilities of this apparatus and to allow comment on the controversy surrounding the existence of HCrO4- raised by recent Raman studies of the aqueous chromate system at ambient conditions. RP PALMER, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 31 TC 11 Z9 12 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1994 EP 1998 DI 10.1063/1.1143988 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100050 ER PT J AU BENHAR, O PANDHARIPANDE, VR PIEPER, SC AF BENHAR, O PANDHARIPANDE, VR PIEPER, SC TI ELECTRON-SCATTERING STUDIES OF CORRELATIONS IN NUCLEI SO REVIEWS OF MODERN PHYSICS LA English DT Article ID LONGITUDINAL RESPONSE FUNCTIONS; HIGH-SPIN STATES; MOMENTUM-TRANSFER; 4 NUCLEI; MATTER; HE-3; TRANSPARENCY; TRANSVERSE; PB-208; DISTRIBUTIONS AB The authors review theoretical estimates of spatial, spin, and isospin correlations among the nucleons in nuclei. The momentum distribution and spectral function of nucleons in nuclei are also discussed. The theoretical estimates are compared with the observed correlation effects in the inclusive scattering of electrons from nuclei, at energies ranging from a few hundred MeV to several GeV. The observed transparencies of nuclei to protons ejected in inclusive e,e'p reactions are also compared with their theoretical estimates. Finally, the quenching of exclusive single-quasiparticle-type reactions, indicative of the overall strength of correlations in nuclei, is discussed. There appears to be a qualitative agreement between theory and experiment, but a firm quantitative understanding is still to be obtained. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RI Benhar, Omar/J-6044-2012 OI Benhar, Omar/0000-0001-6818-9215 NR 55 TC 51 Z9 51 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 J9 REV MOD PHYS JI Rev. Mod. Phys. PD JUL PY 1993 VL 65 IS 3 BP 817 EP 828 DI 10.1103/RevModPhys.65.817 PN 1 PG 12 WC Physics, Multidisciplinary SC Physics GA LV742 UT WOS:A1993LV74200007 ER PT J AU JANG, H CHAN, DK SEIDMAN, DN MERKLE, KL AF JANG, H CHAN, DK SEIDMAN, DN MERKLE, KL TI ATOMIC-SCALE STUDIES OF THE MECHANISMS OF INTERNAL OXIDATION SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID INTERFACES C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. RP JANG, H (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208, USA. RI Seidman, David/B-6697-2009 NR 42 TC 8 Z9 8 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1993 VL 29 IS 1 BP 69 EP 74 DI 10.1016/0956-716X(93)90256-R PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD781 UT WOS:A1993LD78100013 ER PT J AU SANDERS, PG WEERTMAN, JR BARKER, JG SIEGEL, RW AF SANDERS, PG WEERTMAN, JR BARKER, JG SIEGEL, RW TI SMALL-ANGLE NEUTRON-SCATTERING FROM NANOCRYSTALLINE PALLADIUM AS A FUNCTION OF ANNEALING SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARY CAVITIES; PD; FATIGUE C1 NIST,COLD NEUTRON RES FACIL,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SANDERS, PG (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208, USA. RI Weertman, Julia/B-7540-2009 NR 21 TC 35 Z9 35 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1993 VL 29 IS 1 BP 91 EP 96 DI 10.1016/0956-716X(93)90260-Y PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD781 UT WOS:A1993LD78100017 ER PT J AU GIESEKE, BG ALEXANDER, DJ SIKKA, VK BALDWIN, RH AF GIESEKE, BG ALEXANDER, DJ SIKKA, VK BALDWIN, RH TI MECHANICAL-PROPERTIES OF DUCTILE FE3AL-BASED PLATES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ALLOYS RP GIESEKE, BG (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1993 VL 29 IS 1 BP 129 EP 134 DI 10.1016/0956-716X(93)90267-V PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD781 UT WOS:A1993LD78100024 ER PT J AU WRIGHT, SI ROLLETT, AD STOUT, MG AF WRIGHT, SI ROLLETT, AD STOUT, MG TI INPLANE ANISOTROPY OF AS-ROLLED COPPER SHEET (VOL 28, PG 985, 1993) SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Correction, Addition RP WRIGHT, SI (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 1 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 1 PY 1993 VL 29 IS 1 BP 145 EP 145 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD781 UT WOS:A1993LD78100027 ER PT J AU MOHANDAS, N CHASIS, JA AF MOHANDAS, N CHASIS, JA TI RED-BLOOD-CELL DEFORMABILITY, MEMBRANE MATERIAL PROPERTIES AND SHAPE - REGULATION BY TRANSMEMBRANE, SKELETAL AND CYTOSOLIC PROTEINS AND LIPIDS SO SEMINARS IN HEMATOLOGY LA English DT Article ID REFLECT SPECTRIN DEFICIENCIES; OXIDATION-INDUCED CHANGES; ERYTHROCYTE-MEMBRANE; HEREDITARY ELLIPTOCYTOSIS; MECHANICAL STABILITY; VISCOELASTIC PROPERTIES; CYTOPLASMIC DOMAIN; HEMOLYTIC-ANEMIAS; GLYCOPHORIN-A; SPHEROCYTOSIS RP MOHANDAS, N (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,MAILSTOP 74-157,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NIDDK NIH HHS [DK26263, DK32094] NR 96 TC 237 Z9 247 U1 6 U2 45 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0037-1963 J9 SEMIN HEMATOL JI Semin. Hematol. PD JUL PY 1993 VL 30 IS 3 BP 171 EP 192 PG 22 WC Hematology SC Hematology GA LM924 UT WOS:A1993LM92400002 PM 8211222 ER PT J AU WRIGHT, SJ AF WRIGHT, SJ TI IDENTIFIABLE SURFACES IN CONSTRAINED OPTIMIZATION SO SIAM JOURNAL ON CONTROL AND OPTIMIZATION LA English DT Article DE CONSTRAINED OPTIMIZATION; ACTIVE SET IDENTIFICATION ID PROJECTION AB The concept of a ''class-C(p) identifiable surface'' of a convex set in Euclidean space is introduced. The paper shows how the smoothness of these surfaces is related to the smoothness of the projection operator and presents finite identification results for certain algorithms for minimization of a function over this set. The work uses a partially geometric view of constrained optimization to generalize previous finite dentification results. RP WRIGHT, SJ (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 11 TC 33 Z9 33 U1 1 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0363-0129 J9 SIAM J CONTROL OPTIM JI SIAM J. Control Optim. PD JUL PY 1993 VL 31 IS 4 BP 1063 EP 1079 DI 10.1137/0331048 PG 17 WC Automation & Control Systems; Mathematics, Applied SC Automation & Control Systems; Mathematics GA LP152 UT WOS:A1993LP15200013 ER PT J AU NG, E PEYTON, BW AF NG, E PEYTON, BW TI A SUPERNODAL CHOLESKY FACTORIZATION ALGORITHM FOR SHARED-MEMORY MULTIPROCESSORS SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE PARALLEL ALGORITHMS; SPARSE LINEAR SYSTEMS; CHOLESKY FACTORIZATION; SUPERNODES ID SPARSE; ELIMINATION AB This paper presents a parallel sparse Cholesky factorization algorithm for shared-memory MIMD multiprocessors. The algorithm is particularly well suited for vector supercomputers with multiple processors, such as the Cray Y-MR The new algorithm is a straightforward parallelization of the left-looking supernodal sparse Cholesky factorization algorithm. Like its sequential predecessor, it improves performance by reducing indirect addressing and memory traffic. Experimental results on a Cray Y-MP demonstrate the effectiveness of the new algorithm. On eight processors of a Cray Y-MP, the new routine performs the factorization at rates exceeding one Gflop for several test problems from the Harwell-Boeing sparse matrix collection. RP NG, E (reprint author), OAK RIDGE NATL LAB,MAT SCI SECT,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 26 Z9 26 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD JUL PY 1993 VL 14 IS 4 BP 761 EP 769 DI 10.1137/0914048 PG 9 WC Mathematics, Applied SC Mathematics GA LJ448 UT WOS:A1993LJ44800001 ER PT J AU PEMBER, RB AF PEMBER, RB TI NUMERICAL-METHODS FOR HYPERBOLIC CONSERVATION-LAWS WITH STIFF RELAXATION .2. HIGHER-ORDER GODUNOV METHODS SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE HYPERBOLIC CONSERVATION LAWS WITH RELAXATION; STIFF SOURCE TERMS; FINITE DIFFERENCE METHODS; GODUNOV-TYPE METHODS ID GENERALIZED RIEMANN PROBLEM; DIFFERENCE-SCHEMES; REACTING GAS; FLOWS; SYSTEMS AB A higher-order Godunov method is presented for hyperbolic systems of conservation laws with stiff, relaxing source terms. The goal is to develop a Godunov method that produces higher-order accurate solutions using time and space increments governed solely by the nonstiff part of the system, i.e., without fully resolving the effect of the stiff source terms. It is assumed that the system satisfies a certain ''subcharacteristic'' condition. The method is a semi-implicit form of a method developed by Colella for hyperbolic conservation laws with nonstiff source terms. In addition to being semi-implicit, our method differs from the method for nonstiff systems in its treatment of the characteristic form of the equations. The method is applied to a model system of equations and to a system of equations for gas flow with heat transfer. Our analytical and numerical results show that the modifications to the nonstiff method are necessary for obtaining second-order accuracy as the relaxation time tends to zero. Our numerical results also suggest that certain modifications to the Riemann solver used by the Godunov method would help reduce numerical oscillations produced by the scheme near discontinuities. The development of a modified Riemann solver is a topic of future work. RP LAWRENCE LIVERMORE NATL LAB, DIV COMP & MATH RES, L-316, POB 808, LIVERMORE, CA 94550 USA. NR 45 TC 46 Z9 46 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 1064-8275 EI 1095-7197 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD JUL PY 1993 VL 14 IS 4 BP 824 EP 859 DI 10.1137/0914052 PG 36 WC Mathematics, Applied SC Mathematics GA LJ448 UT WOS:A1993LJ44800005 ER PT J AU JARDINE, PM JACOBS, GK WILSON, GV AF JARDINE, PM JACOBS, GK WILSON, GV TI UNSATURATED TRANSPORT PROCESSES IN UNDISTURBED HETEROGENEOUS POROUS-MEDIA .1. INORGANIC CONTAMINANTS SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID CONTROLLING SUBSURFACE TRANSPORT; 2 CONTRASTING WATERSHEDS; SOLUTE TRANSPORT; STORM EVENTS; FORESTED WATERSHEDS; UPPER SUBCATCHMENT; SOIL; MACROPOROSITY; ADSORPTION; COLUMNS AB Prolonged disposal of organic and inorganic waste in shallow land burial sites throughout the USA has prompted detailed investigations of subsurface contaminant transport processes. The fate and transport of contaminant leakage from pits, trenches, and cribs into the vadose zone via storm events is not well understood. The objective of this study was to investigate the thermodynamic and kinetic processes controlling the transport of inorganic contaminants in unsaturated, heterogeneous subsurface media. Large undisturbed columns were isolated from a proposed waste site consisting of fractured saprolite (weathered interbedded shale and limestone), and steady-state nonreactive and reactive solute transport experiments were performed at a variety of pressure heads. Observed breakthrough curves (BTC) for binary and ternary mixtures in the Co-Sr-Ca system were delayed relative to nonreactive Br BTC, indicating that the former tracers were adsorbed by the solid phase. Transport of the binary mixtures Co-Ca and Sr-Ca was predicted reasonably well with the equilibrium convective-dispersive (CD) equation using independent measurements of all model parameters. However, application of the nonequilibrium or kinetic CD model to the observed Sr and Co binary data resulted in an improved description of contaminant transport. Cation-exchange equilibria relationships on homogenized subsurface material, using both shake batch and miscible displacement methods, adequately described the thermodynamic processes that were prevalent during contaminant transport. These results suggest that preferential transport of reactive contaminants is negligible for the unsaturated conditions used in this study, and that the structured saprolite within the subsurface media is a chemically active constituent during reactive solute transport. Although the transport of contaminants in the ternary Co-Sr-Ca system tem exhibited many of the same features as the binary transport studies, an attempt to simulate the transport of contaminants in the ternary system as independent species was less than adequate. C1 UNIV TENNESSEE,DEPT PLANT & SOIL SCI,KNOXVILLE,TN 37996. RP JARDINE, PM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 36 TC 107 Z9 107 U1 2 U2 13 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1993 VL 57 IS 4 BP 945 EP 953 PG 9 WC Soil Science SC Agriculture GA LW044 UT WOS:A1993LW04400012 ER PT J AU JARDINE, PM JACOBS, GK ODELL, JD AF JARDINE, PM JACOBS, GK ODELL, JD TI UNSATURATED TRANSPORT PROCESSES IN UNDISTURBED HETEROGENEOUS POROUS-MEDIA .2. COCONTAMINANTS SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID METAL HYDROUS OXIDES; CHELATING-AGENTS; ADSORPTION; ALUMINUM; HEMATITE; WASTES; MODEL AB Department of Energy facilities involved in defense-related activities have generated huge quantities of low-level radioactive mixed waste during the past several decades. The waste is composed of organically complexed contaminants, also known as co-contaminants, which are typically disposed in shallow land burial sites. The objective of this study was to provide an improved understanding of the geochemical processes controlling co-contaminant transport in heterogeneous, unsaturated subsurface media. Large undisturbed columns were isolated from a proposed waste site consisting of fractured saprolitic shale, and the steady-state unsaturated transport of Co(II)EDTA2-, Co(III)EDTA-, and SrEDTA2- was investigated at -10 cm pressure head. Subsurface Fe and Al sources effectively dissociated the Sr-EDTA2- co-contaminant and Sr was transported as a reactive, uncomplexed species. The EDTA readily complexed with Fe and Al, resulting in significant solid-phase modification of the porous media via chelate-enhanced dissolution and redox alterations. Displacement of Co(II)EDTA2- through the subsurface media was characterized by a MnO2-mediated oxidation of the co-contaminant with subsequent formation of Co(III)EDTA-. The latter co-contaminant was an extremely stable complex that was transported through the subsurface as a single, reactive entity and exhibited an overall retardation that was similar to the uncomplexed contaminant Co2+. Modeling results using equilibrium and nonequilibrium formulations of the convective-dispersive equation suggested that a large portion of the transported Co(III)EDTA- was controlled by time-dependent sorption reactions with the solid phase. Although the solid-phase retention of Co(III)EDTA- and Co2+ were similar, the sorption kinetics of the former were more sluggish relative to Co2+ and contaminant transport was accelerated in the presence of EDTA. C1 UNIV TENNESSEE,DEPT PLANT & SOIL SCI,KNOXVILLE,TN 37901. RP JARDINE, PM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 30 TC 67 Z9 67 U1 0 U2 2 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JUL-AUG PY 1993 VL 57 IS 4 BP 954 EP 962 PG 9 WC Soil Science SC Agriculture GA LW044 UT WOS:A1993LW04400013 ER PT J AU JANDL, S ROUSSEAU, J BOATNER, LA AF JANDL, S ROUSSEAU, J BOATNER, LA TI INFRARED AND RAMAN INVESTIGATIONS OF OH IMPURITIES IN DOPED AND PURE KTAO3 SINGLE-CRYSTALS SO SOLID STATE COMMUNICATIONS LA English DT Article ID FERROELECTRIC MICROREGIONS; STRONTIUM-TITANATE; SPECTROSCOPY; FLUORESCENCE AB Infrared and Raman spectroscopy have been used to investigate the temperature-dependent properties of OH absorption bands in Ni-, Co-, and Nb-doped KTaO3 single crystals and in pure KTaO3. Effects on the OH stretching-mode frequency and on broadening of the absorption bands due either to the presence of Ni and Co impurities or to the ferroelectric phase transition that is induced at a critical temperature in the case of the Nb-doped material KTa0.94Nb0.06O3 were studied. The experimental results are compared to the predictions of two microscopic theoretical models for the location of hydrogen in perovskite-structure oxides of this type. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP JANDL, S (reprint author), UNIV SHERBROOKE, DEPT PHYS, SHERBROOKE J1K 2R1, QUEBEC, CANADA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 12 TC 2 Z9 2 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUL PY 1993 VL 87 IS 1 BP 63 EP 66 DI 10.1016/0038-1098(93)90537-W PG 4 WC Physics, Condensed Matter SC Physics GA LK903 UT WOS:A1993LK90300014 ER PT J AU SHAPIRO, FR TUTTLE, JR AF SHAPIRO, FR TUTTLE, JR TI THE MEYER-NELDEL RULE IN EMISSION RATES FROM DEFECTS IN COPPER INDIUM DISELENIDE SO SOLID STATE COMMUNICATIONS LA English DT Article ID LEVEL TRANSIENT SPECTROSCOPY; SOLAR-CELLS; SEMICONDUCTORS; CUINSE2 AB The Meyer-Neldel (MN) Rule is an observed relationship in groups of related thermally activated processes, and has been found in a large number of seemingly unrelated phenomena. It is shown here that emission rates of holes from defects in copper indium diselenide follow the MN Rule. A few points stray far from the rule, but they may actually belong to an independent group with its own MN relationship. It is suggested that the MN rule may be helpful in distinguishing between different types of defects. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP SHAPIRO, FR (reprint author), DREXEL UNIV,DEPT ELECT & COMP ENGN,PHILADELPHIA,PA 19104, USA. NR 19 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JUL PY 1993 VL 87 IS 3 BP 199 EP 202 DI 10.1016/0038-1098(93)90475-3 PG 4 WC Physics, Condensed Matter SC Physics GA LN357 UT WOS:A1993LN35700008 ER PT J AU BATES, JB GRUZALSKI, GR DUDNEY, NJ LUCK, CF YU, XH JONES, SD AF BATES, JB GRUZALSKI, GR DUDNEY, NJ LUCK, CF YU, XH JONES, SD TI RECHARGEABLE THIN-FILM LITHIUM MICROBATTERIES SO SOLID STATE TECHNOLOGY LA English DT Article ID BATTERIES AB Thin-film lithium cell-based microbatteries having form factors and voltages compatible with microelectronics applications are evolving as viable power sources. This article provides an overview of the current state of development of these new microelectronic components. It also aims to introduce thin-film rechargeable batteries to the semiconductor device community and to stimulate new ideas for their application. C1 EVEREADY BATTERY CO,TECHNOL LAB,WESTLAKE,OH. OAK RIDGE NATL LAB,DIV SOLID STATE,THIN FILM BATTERY PROGRAM,OAK RIDGE,TN 37830. RP BATES, JB (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,CERAM THIN FILMS PROGRAM,OAK RIDGE,TN 37830, USA. RI Dudney, Nancy/I-6361-2016 OI Dudney, Nancy/0000-0001-7729-6178 NR 10 TC 56 Z9 61 U1 2 U2 19 PU PENNWELL PUBL CO SOLID STATE TECHNOLOGY OFFICE PI NASHUA PA TEN TARA BLVD 5TH FLOOR, NASHUA, NH 03062-2801 SN 0038-111X J9 SOLID STATE TECHNOL JI Solid State Technol. PD JUL PY 1993 VL 36 IS 7 BP 59 EP & PG 0 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA LN231 UT WOS:A1993LN23100006 ER PT J AU BUDEN, D ANGELO, JA AF BUDEN, D ANGELO, JA TI THE ROLES AND FUNCTIONS OF A LUNAR BASE NUCLEAR TECHNOLOGY CENTER SO SPACE TECHNOLOGY-INDUSTRIAL AND COMMERCIAL APPLICATIONS LA English DT Article; Proceedings Paper CT 42ND CONGRESS OF THE INTERNATIONAL ASTRONAUTICAL FEDERATION CY OCT 07-11, 1991 CL MONTREAL, CANADA SP INT ASTRONAUT FEDERAT AB This paper describes the roles and functions of a special Nuclear Technology Center which is developed as an integral part of a permanent lunar base. Numerous contemporary studies clearly point out that nuclear energy technology will play a major role in any successful lunar/Mars initiative program and in the overall establishment of humanity's solar system civilization. The key role of nuclear energy in providing power has been recognized. A Nuclear Technology Center developed as part of a permanent lunar base can also help bring about many other nuclear technology applications, such as producing radioisotopes for self-illumination, food preservation, waste sterilization, and medical treatment; providing thermal energy for mining, materials processing and agriculture; and as a source of emergency habitat power. Designing such a center will involve the deployment, operation, servicing and waste product management and disposal of megawatt class reactor power plants. This challenge must be met with a minimum of direct human support at the facility. Furthermore, to support the timely, efficient integration of this Nuclear Technology Center in the evolving lunar base infrastructure, an analog of such a facility will be needed here on Earth. RP BUDEN, D (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0892-9270 J9 SPACE TECHNOL JI Space Tech.-Ind. Comm. Appl. PD JUL PY 1993 VL 13 IS 4 BP 403 EP 409 PG 7 WC Engineering, Aerospace SC Engineering GA LK612 UT WOS:A1993LK61200005 ER PT J AU FAULQUES, E RUSSO, RE PERRY, DL AF FAULQUES, E RUSSO, RE PERRY, DL TI RAMAN SPECTRAL STUDIES OF URANYL SULFATE AND ITS UREA COMPLEX STRUCTURAL ISOMERS SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA English DT Article ID SULFATE AB Using Raman spectroscopy, the authors have studied two forms of the dioxouranium(VI) sulphate complexes of the urea molecule, the bis(urea)dioxouranium(VI) sulphates alpha- and beta-UO2SO4 . 2CO(NH2)2. Raman spectra were recorded using the lambda = 488 and 647. 1 nm laser excitation lines. For lambda = 488 nm, the crystals exhibit strong, structured luminescence, with peaks separated by 857 cm-1 (alpha-form) and 853 cm-1 (beta-form). For lambda = 647.1 nm, very intense Raman spectra are obtained which are similar but slightly different and can be used to distinguish each form. A comparison with the urea and uranyl sulphate hydrate (USH) spectra has clarified the Raman band assignment of the two parent alpha- and beta-forms. Contributions of the urea donor ligand and the sulphate have been identified. Charge transfer to uranium and the uranium-oxygen force constant in the uranyl ion have been evaluated. The results agree with previous X-ray structural investigations. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. INST MAT NANTES,PHYS CRISTALLINE LAB,F-44072 NANTES 3,FRANCE. NR 19 TC 6 Z9 6 U1 2 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD JUL PY 1993 VL 49 IS 7 BP 975 EP 983 DI 10.1016/0584-8539(93)80216-W PG 9 WC Spectroscopy SC Spectroscopy GA LE896 UT WOS:A1993LE89600010 ER PT J AU CHERN, CS MARTENS, JS LI, YQ GALLOIS, BM LU, P KEAR, BH AF CHERN, CS MARTENS, JS LI, YQ GALLOIS, BM LU, P KEAR, BH TI METALORGANIC CHEMICAL-VAPOR-DEPOSITION OF LARGE-AREA HIGH-QUALITY YBA2CU3O7-X FILMS IN A HIGH-SPEED ROTATING-DISC REACTOR SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID PULSED LASER DEPOSITION; THIN-FILMS; SURFACE-RESISTANCE; LOW-TEMPERATURE AB Metalorganic chemical vapour deposition (MOCVD) process, which incorporates a high-speed rotating disc, has been employed for large-area deposition of high-quality YBa2Cu3O7-x (YBCO) over 50 and 75 mm diameter (100) LaAlO3 substrates. Standard deviation film thickness is less than 3% with respect to the average thickness, 3400 A. The inductively measured transition temperatures are 89.5 K across the 50 and 75 mm diameter substrates with transition widths smaller than 1 K. The critical current densities at 77 K and zero magnetic field attain values higher than 2 x 10(6) A cm-2 . R(s) (77 K, 95 GHz) mapping measurements exhibit a single R. value of 50 mOMEGA on 50 mm diameter LaAlO3 substrates. Only the areas within 3 mm of the wafer edge exhibit contour lines of higher R. values. This 'up-scalable' technology can be widely employed for thin-film deposition of many perovskite oxides which have great potential for devices applications. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. STEVENS INST TECHNOL,HOBOKEN,NJ 07030. RUTGERS UNIV,PISCATAWAY,NJ 08854. RP CHERN, CS (reprint author), EMCORE CORP,35 ELIZABETH AVE,SOMERSET,NJ 08873, USA. NR 17 TC 17 Z9 17 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JUL PY 1993 VL 6 IS 7 BP 460 EP 463 DI 10.1088/0953-2048/6/7/002 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LR866 UT WOS:A1993LR86600002 ER PT J AU CHANG, F FORD, PJ SAUNDERS, GA LI, JQ ALMOND, DP CHAPMAN, B CANKURTARAN, M POEPPEL, RB GORETTA, KC AF CHANG, F FORD, PJ SAUNDERS, GA LI, JQ ALMOND, DP CHAPMAN, B CANKURTARAN, M POEPPEL, RB GORETTA, KC TI ANISOTROPIC ELASTIC AND NONLINEAR ACOUSTIC PROPERTIES OF VERY DENSE TEXTURED BI2SR2CACU2O8+Y SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID SINGLE-CRYSTALS; SOUND VELOCITIES; BI2SR2CA1CU2O8; TEMPERATURE; INSTABILITY AB The velocities of longitudinal and shear ultrasonic waves propagated in very dense (95% of theoretical), highly-textured, ceramic Bi2Sr2CaCu2O8+y (Bi2212) have been measured as functions of temperature (between 10 and 290 K) and hydrostatic pressure at 290 K. The main finding is a marked anisotropy of the elastic stiffness constants and their dependences on pressure. We have observed an elastic stiffness constant in thea-b plane that is substantially greater than that in the c direction. This observation is consistent with the crystallographic structure of Bi2212. The anomalous elastic effects and thermal hysteresis, observed previously by several groups in various Bi-based superconductors in the range of 190-240 K, have not been found in the present material. Our observations suggest that these anomalies are not an inherent property of Bi-based cuprates, but instead may depend on the oxygen content and microstructure of the ceramic material. An analysis of sound velocity in a polycrystalline array of elastically anisotropic crystallites is presented. C1 UNIV BATH,SCH MAT SCI,BATH BA2 7AY,AVON,ENGLAND. ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. HACETTEPE UNIV,DEPT PHYS,AKARA 06532,TURKEY. RP CHANG, F (reprint author), UNIV BATH,SCH PHYS,BATH BA2 7AY,AVON,ENGLAND. NR 17 TC 25 Z9 25 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JUL PY 1993 VL 6 IS 7 BP 484 EP 489 DI 10.1088/0953-2048/6/7/006 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LR866 UT WOS:A1993LR86600006 ER PT J AU HIGASHIYAMA, K LEWIS, SK YNZUNZA, RX TOBER, ED KIM, YJ FADLEY, CS AF HIGASHIYAMA, K LEWIS, SK YNZUNZA, RX TOBER, ED KIM, YJ FADLEY, CS TI ASYMMETRY OF ADATOMS ON GE(111) OBSERVED BY SCANNING-TUNNELING-MICROSCOPY - THE CLEAN C(2X8) AND SN-INDUCED (7X7) STRUCTURES SO SURFACE SCIENCE LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; SURFACES; SI(111); 2X8 AB Scanning tunneling microscopy (STM) is used to study two types of structures formed on Ge(111): clean c(2 x 8) and the Sn-induced (7 x 7). For the clean annealed Ge(111) surface, we have found for the first time co-existent symmetric and asymmetric c(2 x 8) structures in separate domains with typical sizes of 400 angstrom. Exposure to submonolayer amounts of Sn at high temperatures is found to form both (7 X 7) and (5 x 5) structures with domain sizes of 300 angstrom. Empty-state images of the (7 x 7) reveal strong asymmetry among the adatoms in the dimer-adatom-stacking fault (DAS) model: the inner adatoms tend to form twelve-member rings around the corner holes, suggesting preferential Sn adsorption in these rings. The relationship of these observations to previous structural and spectroscopic studies of these surfaces is discussed. C1 UNIV HAWAII,DEPT CHEM,HONOLULU,HI 96822. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV TSUKUBA,INST PHYS,TSUKUBA,IBARAKI 305,JAPAN. RP HIGASHIYAMA, K (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 30 TC 11 Z9 11 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1993 VL 291 IS 1-2 BP 47 EP 56 DI 10.1016/0039-6028(93)91475-5 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LK470 UT WOS:A1993LK47000011 ER PT J AU BARNARD, JC HOCK, KM SILLER, L HUNT, MRC WENDELKEN, JF PALMER, RE AF BARNARD, JC HOCK, KM SILLER, L HUNT, MRC WENDELKEN, JF PALMER, RE TI NEW RESONANCES IN HIGH-RESOLUTION EELS OF ADSORBED MOLECULES - ELECTRONIC EXCITATION OF PHYSISORBED O-2 SO SURFACE SCIENCE LA English DT Article ID SCATTERING; ATTACHMENT; GRAPHITE; IMPACT; STATES; O2 AB We present an electron energy loss study of the X3SIGMA(g)- --> a 1DELTA(g) electronic excitation of O2 monolayers physisorbed on Pt(111) and graphite. We find negative ion resonances at incident electron energies of approximately 6 and 13 eV. The resonance at 13 eV has not previously been observed in either gas phase or adsorbed O2. The angular variation of the a 1DELTA(g) intensity indicates that the 13 eV resonance most likely corresponds to the 2DELTA(u) negative ion state. This assignment contrasts with the assignment of the 13 eV Resonance reported in electron stimulated desorption studies of condensed O2. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP BARNARD, JC (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,MADINGLEY RD,CAMBRIDGE CB3 0HE,ENGLAND. RI Palmer, Richard/A-5366-2008 OI Palmer, Richard/0000-0001-8728-8083 NR 25 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 1 PY 1993 VL 291 IS 1-2 BP 139 EP 144 DI 10.1016/0039-6028(93)91485-8 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LK470 UT WOS:A1993LK47000021 ER PT J AU RAFFENETTI, RC RUEDENBERG, K JANSSEN, CL SCHAEFER, HF AF RAFFENETTI, RC RUEDENBERG, K JANSSEN, CL SCHAEFER, HF TI EFFICIENT USE OF JACOBI ROTATIONS FOR ORBITAL OPTIMIZATION AND LOCALIZATION SO THEORETICA CHIMICA ACTA LA English DT Article DE JACOBI ROTATIONS; 4-INDEX TRANSFORMATION; ORBITAL OPTIMIZATION; ORBITAL LOCALIZATION AB Quantum chemical orbital optimizations can be accomplished by Newton-type iterations, where all orbitals are improved at each step; or by a succession of Jacobi rotations, where only two orbitals are improved at any one step. In both schemes, the iterative updating of the four-index two-electron integrals requires a large computational effort. We show that the four-index transformation due to a Jacobi rotation can be simplified to such a degree that the successive execution of the four-index transformations of N(N - 1)/2 different Jacobi rotations requires no greater computational effort than that required by the one full orthogonal transformation which is the product of all N(N - 1)/2 Jacobi rotations. The four-index updating has therefore no bearing on the relative merit of the Newton approach versus the Jacobi approach. The Jacobi approach has, however, an advantage if the optimization of each Jacobi rotation angle is simple and if the effectiveness of the individual Jacobi rotations can be assessed without the execution of four-index transformations. For, in that case, all ineffectual rotations are easily deleted from the iterative sequence. Whether convergence can be guaranteed for one or the other approach is also relevant. Our conclusions are illustrated by application to the problem of intrinsic orbital localization where the succession of Jacobi rotations is the more effective strategy. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50010 USA. UNIV GEORGIA, CTR COMPUTAT CHEM, ATHENS, GA 30602 USA. NR 25 TC 41 Z9 41 U1 0 U2 5 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD JUL PY 1993 VL 86 IS 1-2 BP 149 EP 165 DI 10.1007/BF01113521 PG 17 WC Chemistry, Physical SC Chemistry GA LP788 UT WOS:A1993LP78800011 ER PT J AU HANSON, PJ WULLSCHLEGER, SD BOHLMAN, SA TODD, DE AF HANSON, PJ WULLSCHLEGER, SD BOHLMAN, SA TODD, DE TI SEASONAL AND TOPOGRAPHIC PATTERNS OF FOREST FLOOR CO2 EFFLUX FROM AN UPLAND OAK FOREST SO TREE PHYSIOLOGY LA English DT Article DE FOREST CARBON SEQUESTRATION; GLOBAL CARBON BUDGETS; RESPIRATION; SOIL TEMPERATURE; SOIL WATER AB Forest floor CO2 efflux (FF(cer)) is an important component of global carbon budgets, but the spatial variability of forest floor respiration within a forest type is not well documented. Measurements of FF(cer) were initiated in mid-March of 1991 and continued at biweekly to monthly intervals until mid-November. Observations were made at 45 sites along topographic gradients of the Walker Branch Watershed, Tennessee including northeast and southwest facing slopes, valley-bottoms, and exposed ridge-top locations. The FF(cer) measurements were made with a portable gas-exchange system, and all observations were accompanied by soil temperature and soil water content measurements. As expected, FF(cer) exhibited a distinct seasonal trend following patterns of soil temperature, but soil water content and the volume percent of the soil's coarse fraction were also correlated with observed rates. Over the entire measurement period, FF(cer) ranged from a typical minimum of 0.8 mumol m-2s-1 to an average maximum near 5.7 mumol m-2s-1. No significant differences in FF(cer) were observed among the ridge-top and slope positions, but FF(cer) in the valley-bottom locations was lower on several occasions. An empirical model of FF(cer) based on these observations is suggested for application to whole-stand estimates of forest carbon sequestration. RP HANSON, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Hanson, Paul J./D-8069-2011; Wullschleger, Stan/B-8297-2012 OI Hanson, Paul J./0000-0001-7293-3561; Wullschleger, Stan/0000-0002-9869-0446 NR 0 TC 263 Z9 298 U1 2 U2 23 PU HERON PUBLISHING PI VICTORIA PA BOX 5579 STATION B, VICTORIA BC V8R 6S4, CANADA SN 0829-318X J9 TREE PHYSIOL JI Tree Physiol. PD JUL PY 1993 VL 13 IS 1 BP 1 EP 15 PG 15 WC Forestry SC Forestry GA LL916 UT WOS:A1993LL91600001 ER PT J AU STOLTZFUS, L RUBIN, EM AF STOLTZFUS, L RUBIN, EM TI ATHEROGENESIS - INSIGHTS FROM THE STUDY OF TRANSGENIC AND GENE-TARGETED MICE SO TRENDS IN CARDIOVASCULAR MEDICINE LA English DT Review ID HIGH-DENSITY-LIPOPROTEIN; APOLIPOPROTEIN-A-I; DETERMINING ATHEROSCLEROSIS SUSCEPTIBILITY; EXPRESSING HUMAN APOLIPOPROTEIN(A); HERITABLE HYPERLIPIDEMIC RABBITS; PLASMA-LEVELS; E DEFICIENCY; LESIONS; HYPERCHOLESTEROLEMIA; CHOLESTEROL AB Owing to the investigative power of classical mouse genetics and the development of transgenic and gene-targeting technologies, the mouse has increasingly been used to study atherogenesis. Investigators, have manipulated the plasma levels of several proteins involved in lipid metabolism through the engineering of mice and assessed the impact of these changes on the progression of murine atherogenesis. These studies have established causal relationships between the expression of defined genetic elements and atherosclerosis in a manner not feasible in humans. Studies of transgenic mice with genetically altered levels of apolipoproteins A-I, (a), and E have provided important insights into the in vivo role of these proteins in atherogenesis. These studies illustrate the potential to dissect the complex genetics of atherosclerosis susceptibility with the use of transgenic and gene-targeted mice. RP STOLTZFUS, L (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. NR 31 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1050-1738 J9 TRENDS CARDIOVAS MED JI Trends Cardiovasc. Med. PD JUL-AUG PY 1993 VL 3 IS 4 BP 130 EP 134 DI 10.1016/1050-1738(93)90013-V PG 5 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA LT901 UT WOS:A1993LT90100006 PM 21244939 ER PT J AU STETAR, EA BOSTON, HL LARSEN, IL MOBLEY, MH AF STETAR, EA BOSTON, HL LARSEN, IL MOBLEY, MH TI THE REMOVAL OF RADIOACTIVE COBALT, CESIUM, AND IODINE IN A CONVENTIONAL MUNICIPAL WASTE-WATER TREATMENT-PLANT SO WATER ENVIRONMENT RESEARCH LA English DT Article DE CESIUM; COBALT; IODINE; PARTITIONING; RADIONUCLIDES; RADIOTRACER; SLUDGE; WASTE-WATER ID ACTIVATED-SLUDGE PROCESS; INSOLUBLE METAL REMOVAL; PRIMARY SEDIMENTATION; BEHAVIOR; ELEMENTS AB A radiotracer study was conducted to determine removal efficiencies for cobalt, cesium, and iodine in a conventional municipal wastewater treatment plant. The study was conducted in a full-scale facility that provides primary treatment through physical settling and secondary treatment using activated sludge. The radiotracers, Co-58 and Cs-134 as chlorides, and I-131 as NaI, were equilibrated in raw wastewater and introduced to the treatment system as a pulse in the incoming raw wastewater. Samples of wastewater and sludge were collected and analyzed to quantify primary treatment, secondary treatment, and overall removal efficiencies. Selected samples were filtered to determine the partitioning of the tracers between the solid and liquid phases of the wastewater and sludge throughout the treatment process. In the incoming wastewater, approximately 10% of the Co-58, 7% of the Cs-134, and 3% of the I-131 were associated with suspended solids. The suspended tracer fractions decreased across the treatment plant. Primary treatment resulted in the partial removal of the incoming suspended fraction with observed removal efficiencies of 8.1 % and 3.0% for Co-58 and Cs-134, respectively, and an estimated removal of 2% for I-131. Approximately 80% of the radiotracers in the primary treatment sludge were associated with the sludge solids. The affinity of the radiotracers for the activated sludge solids was in the following order: Co-58 > Cs-134 > I-131. Secondary treatment removal efficiencies of 25% and 9.4% were observed for Co-58 and Cs-134, respectively. The secondary treatment removal efficiency for I-131 was estimated to be 2-3%. Overall removal efficiencies were 31%, 12%, and 3-5% for Co-58, Cs-134, and I-131, respectively. The remaining fractions of the radiotracers remained within the soluble phase of the wastewater and were discharged in the treatment plant effluent. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,TENNESSEE DIV RADIOL HLTH,OAK RIDGE,TN 37831. RP STETAR, EA (reprint author), PERFORMANCE TECHNOL GRP INC,1210 7TH AVE N,NASHVILLE,TN 37208, USA. NR 29 TC 13 Z9 13 U1 0 U2 6 PU WATER ENVIRONMENT FEDERATION PI ALEXANDRIA PA 601 WYTHE ST, ALEXANDRIA, VA 22314-1994 SN 1061-4303 J9 WATER ENVIRON RES JI Water Environ. Res. PD JUL-AUG PY 1993 VL 65 IS 5 BP 630 EP 639 PG 10 WC Engineering, Environmental; Environmental Sciences; Limnology; Water Resources SC Engineering; Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LU955 UT WOS:A1993LU95500004 ER PT J AU EASTERLY, CE JONES, TD GLASS, LR OWEN, BA WALSH, PJ AF EASTERLY, CE JONES, TD GLASS, LR OWEN, BA WALSH, PJ TI BIOTESTING WASTE-WATER FOR HAZARD EVALUATION SO WATER RESEARCH LA English DT Article DE BIOTESTING; RELATIVE POTENCY; CHLORINATION; WATER; SHORT-TERM TEST; SHORT-TERM BIOASSAY; TOXICITY; WASTE-WATER; RISK; HEALTH HAZARD; HAZARD INDEX ID DRINKING-WATER; CHEMICALS; RADIONUCLIDES; MIXTURES AB Evaluation of the potential hazard of treated water can be performed in two basic ways: chemical identification followed by chemical-by-chemical hazard summation or by means of biotesting the water as if the contaminants were a single compound. Current practice is somewhere in between. For the most part, the use of bioassays is limited to a single test system, and the results are usually interpreted as either positive or negative. That is, binary information is the usual result of a bioassay evaluation. Our work over the past decade has facilitated the development of an alternative approach to interpreting bioassay results. The key element in our approach is the use of relative comparisons. Relative comparisons between responses of a given test system using wastewater and a well-known agent allow a graded response for each different bioassay. By using a battery of different bioassay systems, each with different mechanisms of toxicity. we are able to characterize the composite toxicological response to a wastewater sample with respect to a well-studied ''reference'' chemical. The value of this approach is that, if the use of the reference chemical has acceptable fisk to the majority of the population or at least a known human risk, the wastewater can be evaluated with respect to that factor. We use water chlorination as a ''reference'' material in this report to illustrate the concept. RP EASTERLY, CE (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,HLTH EFFECTS GRP,OAK RIDGE,TN 37831, USA. NR 23 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0043-1354 J9 WATER RES JI Water Res. PD JUL PY 1993 VL 27 IS 7 BP 1145 EP 1152 DI 10.1016/0043-1354(93)90006-4 PG 8 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA LF180 UT WOS:A1993LF18000006 ER PT J AU LEHMANN, BE DAVIS, SN FABRYKAMARTIN, JT AF LEHMANN, BE DAVIS, SN FABRYKAMARTIN, JT TI ATMOSPHERIC AND SUBSURFACE SOURCES OF STABLE AND RADIOACTIVE NUCLIDES USED FOR GROUNDWATER DATING SO WATER RESOURCES RESEARCH LA English DT Review ID MILK RIVER AQUIFER; DISSOLVED ORGANIC-CARBON; STRIPA GRANITE; ISOTOPE GEOCHEMISTRY; NATURAL PRODUCTION; INSITU PRODUCTION; CANADA; ALBERTA; HELIUM; I-129 AB Theoretical calculations together with a review of data from Sweden, Switzerland and Canada indicate that given sufficient isolation time and U and Th in the aquifer matrix, deep subsurface production of H-3, He-4, Cl-36, Ar-37, Ar-39, Ar-40, Kr-85, I-129, and Rn-222 can overshadow the normal atmospheric component of these nuclides in recharging groundwater. Although direct evidence is lacking, calculations suggest that small but measurable subsurface production of H-3 and C-14 could also take place in aquifers having high U and Th concentrations. Some groundwater which has been recharged during the past 40 years will have H-3, He-3, Cl-36, Kr-85, and I-129 concentrations which are dominantly anthropogenic. Dating methods with the least complications in interpretation appear to be H-3-He-3 for postbomb waters and Kr-81 for waters in the range of 5 x 10(4) to 1 x 10(6) a. C1 UNIV ARIZONA,DEPT HYDROL & WATER RESOURCES,TUCSON,AZ 85721. LOS ALAMOS NATL LAB,ISOTOPE & ENVIRONM GEOCHEM GRP INC9,LOS ALAMOS,NM 87545. RP LEHMANN, BE (reprint author), UNIV BERN,INST PHYS,CH-3012 BERN,SWITZERLAND. NR 103 TC 61 Z9 63 U1 1 U2 10 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUL PY 1993 VL 29 IS 7 BP 2027 EP 2040 DI 10.1029/93WR00543 PG 14 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LL335 UT WOS:A1993LL33500016 ER PT J AU ZIMMERMAN, RW CHEN, G HADGU, T BODVARSSON, GS AF ZIMMERMAN, RW CHEN, G HADGU, T BODVARSSON, GS TI A NUMERICAL DUAL-POROSITY MODEL WITH SEMIANALYTICAL TREATMENT OF FRACTURE MATRIX FLOW SO WATER RESOURCES RESEARCH LA English DT Article ID POROUS-MEDIA; COUPLING TERM; PERMEABILITY; RESERVOIR; BLOCK; FLUID AB A new dual-porosity model is developed for single-phase fluid flow in fractured/porous media. Flow is assumed to take place through the fracture network and between the fractures and matrix blocks. The matrix blocks are treated in a lumped parameter manner, with a single average pressure used for each matrix block. Rather than assuming that fracture/matrix flux is proportional to the difference between the fracture pressure and matrix pressure at each point, as is done in the Warren-Root model, we use a nonlinear equation which more accurately models the flux over all time regimes, including both early and late times. This flux equation is compared with analytical solutions for spherical blocks with prescribed pressure variations on their boundaries. The nonlinear flux equation is also used as a source/sink term in the numerical simulator TOUGH. The modified code allows more accurate simulations than the conventional Warren-Root method, with a large savings (about 90%) in computational time compared to methods which explicitly discretize the matrix blocks. RP LAWRENCE BERKELEY LAB, DIV EARTH SCI, BERKELEY, CA 94720 USA. OI Zimmerman, Robert/0000-0001-6674-3403 NR 33 TC 111 Z9 115 U1 2 U2 19 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0043-1397 EI 1944-7973 J9 WATER RESOUR RES JI Water Resour. Res. PD JUL PY 1993 VL 29 IS 7 BP 2127 EP 2137 DI 10.1029/93WR00749 PG 11 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LL335 UT WOS:A1993LL33500023 ER PT J AU KONDOLF, GM SALE, MJ WOLMAN, MG AF KONDOLF, GM SALE, MJ WOLMAN, MG TI MODIFICATION OF FLUVIAL GRAVEL SIZE BY SPAWNING SALMONIDS SO WATER RESOURCES RESEARCH LA English DT Article ID REDDS; TROUT AB Salmonids (salmon and trout) winnow fine sediment from streambed gravels during construction of the nest or ''redd'' used for spawning and incubation of fertilized eggs. The gravels and interstitial fine sediments excavated during this process are exposed to currents and differentially transported: gravels move a short distance, while the fine sediments are swept further downstream from the redd. To quantify the resultant modification of particle size distributions in redds, we sampled redds and adjacent undisturbed gravels to document changes in size distributions. These data were compiled with previously published observations to analyze the general nature of size modification during spawning. The final percentage finer than 1 mm in the gravels, P1f, is related to the initial percentage finer than 1 mm, P1i, by the equation P1f = 0.63 P1i. Hydraulic variables (water surface slope, mean column velocity, depth, shear stress, unit stream power) explained little of the variance and did not appear in the optimal models. Because fisheries biologists are called upon to evaluate gravels as potential spawning sites, these findings should prove useful in such evaluations. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. JOHNS HOPKINS UNIV,DEPT GEOG & ENVIRONM,BALTIMORE,MD 21218. RP KONDOLF, GM (reprint author), UNIV CALIF BERKELEY,COLL ENVIRONM DESIGN,DEPT LANDSCAPE ARCHITECTURE,BERKELEY,CA 94720, USA. NR 42 TC 82 Z9 82 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUL PY 1993 VL 29 IS 7 BP 2265 EP 2274 DI 10.1029/93WR00401 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LL335 UT WOS:A1993LL33500034 ER PT J AU SANFORD, WE PARLANGE, JY STEENHUIS, TS AF SANFORD, WE PARLANGE, JY STEENHUIS, TS TI HILLSLOPE DRAINAGE WITH SUDDEN DRAWDOWN - CLOSED-FORM SOLUTION AND LABORATORY EXPERIMENTS SO WATER RESOURCES RESEARCH LA English DT Article ID SUBSURFACE STORMFLOW; FLOW; LAYER AB Theory is developed for hillslope drainage and is applied to the condition of sudden drawdown at the aquifer outlet. The equations for prediction of cumulative outflow volume, flow rate, and water table profile are based on the Boussinesq approximation for subsurface water flow above a sloping impermeable. layer. The advantages of the theory presented here am that the assumption of a long, thin aquifer is unnecessary; the same equations apply to both sloping and horizontal aquifers; and the equations contain only parameters that are easily measured or estimated: slope, drainable porosity, saturated hydraulic conductivity, and layer thickness. The accuracy of the outflow equations is illustrated by a series of laboratory experiments. C1 CORNELL UNIV,DEPT AGR & BIOL ENGN,ITHACA,NY 14853. RP SANFORD, WE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Sanford, William/F-7380-2016 OI Sanford, William/0000-0001-9085-1367 NR 24 TC 25 Z9 25 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD JUL PY 1993 VL 29 IS 7 BP 2313 EP 2321 DI 10.1029/93WR00515 PG 9 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LL335 UT WOS:A1993LL33500038 ER PT J AU LIU, P BAHADUR, S VERHOEVEN, JD AF LIU, P BAHADUR, S VERHOEVEN, JD TI THE MECHANICAL AND TRIBOLOGICAL BEHAVIOR OF CU-NB IN-SITU COMPOSITES SO WEAR LA English DT Article ID METAL-MATRIX COMPOSITES; WEAR BEHAVIOR; FRICTION; GRAPHITE AB The mechanical and tribological properties of Cu-Nb in situ composites were studied. The composites were prepared by consumable arc melting of Cu and Nb electrodes, by casting, and by successive deformation of the cast ingot. Dry sliding friction and wear tests were performed in a pin-on-disk set-up, with the composite pin rubbing under atmospheric conditions against a hardened tool steel disk surface. The effect of Nb proportion on the tribological behavior of Cu-Nb composites was studied. It was found that the coefficient of friction decreased with increasing Nb proportion in the composite and that Cu-20vol.%Nb composite had the best wear resistance. The effect of prior deformation strain on the coefficient of friction and wear of Cu-15vol.%Nb composites was also investigated. The micromechanisms of wear were studied by scanning electron microscopy. It was concluded that cracking in the severely work hardened regions led to the generation of wear particles. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MECH ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,US DOE,AMES LAB,AMES,IA 50011. NR 16 TC 10 Z9 10 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD JUL 1 PY 1993 VL 166 IS 2 BP 133 EP 139 DI 10.1016/0043-1648(93)90254-J PG 7 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA LM993 UT WOS:A1993LM99300001 ER PT J AU MILEWSKI, JO LEWIS, GK WITTIG, JE AF MILEWSKI, JO LEWIS, GK WITTIG, JE TI MICROSTRUCTURAL EVALUATION OF LOW AND HIGH DUTY CYCLE ND-YAG LASER-BEAM WELDS IN 2024-T3 ALUMINUM SO WELDING JOURNAL LA English DT Article DE MICROSTRUCTURE; ND-YAG LASER WELDS; LOW/HIGH DUTY CYCLE; 2024-T3 ALUMINUM; HOT TEARING; POROSITY; WELD MORPHOLOGY; HOT CRACK SUSCEPTIBILITY; SOLIDIFICATION HIS; THERMAL GRADIENTS AB The propensity for hot tearing and porosity in pulsed Nd-YAG laser beam welding of 2024-T3 aluminum was observed to vary with ''beam on'' duty cycle. High average laser output power of 1 kW and variation in duty cycle were achieved by multiplexing a system of three 400-W average power Nd:YAG lasers with fiber-optic delivery. Operating this system with a greater than 60% duty cycle eliminated the severe hot tearing and gross porosity that occurred in lower duty cycle welds made under otherwise identical conditions. Microstructural characterization of the low and high duty cycle welds identified differences in weld morphology directly related to hot-crack susceptibility. Solute segregation and the distribution of low melting point phases are dependent upon the solidification history. In addition, manipulating the input power alters the solidification-related stress state developed in the weld fusion zone. Appropriate adjustment of the process parameters, e.g., duty cycle, optimizes the solidification velocity, thermal gradients, and stress state in the weld fusion zone in order to prevent hot tearing in this crack-susceptible aluminum alloy. C1 VANDERBILT UNIV,NASHVILLE,TN 37240. RP MILEWSKI, JO (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 16 TC 16 Z9 16 U1 2 U2 3 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUL PY 1993 VL 72 IS 7 BP S341 EP S346 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LL334 UT WOS:A1993LL33400019 ER PT J AU HEGEDUS, F WOBRAUSCHEK, P SOMMER, WF RYON, RW STRELI, C WINKLER, P FERGUSON, P KREGSAMER, P RIEDER, R VICTORIA, M HORSEWELL, A AF HEGEDUS, F WOBRAUSCHEK, P SOMMER, WF RYON, RW STRELI, C WINKLER, P FERGUSON, P KREGSAMER, P RIEDER, R VICTORIA, M HORSEWELL, A TI TOTAL-REFLECTION X-RAY-FLUORESCENCE SPECTROMETRY OF METAL SAMPLES USING SYNCHROTRON-RADIATION AT SSRL SO X-RAY SPECTROMETRY LA English DT Article; Proceedings Paper CT EUROPEAN CONF ON ENERGY-DISPERSIVE X-RAY SPECTROMETRY CY MAY 30-JUN 06, 1992 CL MYCONOS, GREECE AB It was demonstrated that a total reflection x-ray fluorescence spectrometer, using monoenergetic synchrotron radiation as the primary x-ray source, is suitable to measure the concentration of transmutational elements in Cu and Fe metal matrices. In a typical irradiation of copper with 590 MeV protons or with spallation neutrons, where the damage dose is 0.4 dpa (displacement per atom), the calculated concentration of transmutational elements is Ni 25, Co 8 and Fe 8 mug g-1. The results show that the minimum detectable concentrations were lower than these values. The energy of the synchrotron radiation was set just below the K-edge energy of the matrix element, eliminating the large peak due to the matrix. As an example, in the case of a Cu (Z = 29) matrix, the minimum detectable concentration for Ni (Z = 28) was as low as 3 mug g-1. In order to check systematically the possible geometric arrangements of beam direction-reflector position-detector position, a new vacuum chamber was designed and tested. It provides all technical components for remote control of the adjustment procedure to align the reflector in total reflection geometry. Two ways of positioning the reflector in the beam, vertical to the plane of polarization and parallel to that plane, were investigated, to find the best excitation conditions and lowest limits of detection. A few pg corresponding to a concentration of ng g-1 of samples where the matrix can be easily removed as in aqueous or acidic solutions and 50 ng g-1 concentration of metals in a light matrix as in oil were found as detection limits. C1 UNIV VIENNA,ATOMINST,VIENNA,AUSTRIA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RISO NATL LAB,DK-4000 ROSKILDE,DENMARK. RP HEGEDUS, F (reprint author), PAUL SCHERRER INST,VILLIGEN,SWITZERLAND. NR 0 TC 10 Z9 10 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0049-8246 J9 X-RAY SPECTROM JI X-Ray Spectrom. PD JUL-AUG PY 1993 VL 22 IS 4 BP 277 EP 280 DI 10.1002/xrs.1300220419 PG 4 WC Spectroscopy SC Spectroscopy GA LQ042 UT WOS:A1993LQ04200018 ER PT J AU BILTOFT, PJ AF BILTOFT, PJ TI CHARACTERISTICS OF LAYERED SYNTHETIC MICROSTRUCTURE DEVICES FOR X-RAY SPECTROMETRY APPLICATIONS SO X-RAY SPECTROMETRY LA English DT Article; Proceedings Paper CT EUROPEAN CONF ON ENERGY-DISPERSIVE X-RAY SPECTROMETRY CY MAY 30-JUN 06, 1992 CL MYCONOS, GREECE AB Multi-layer structures offer the unique ability to control the spectral distribution of x-rays at non-grazing incidence and to provide the ability to focus x-rays. This combination of attributes offers some exciting possibilities for x-ray spectrometry. Double crystal monochromators using multi-layer structures have shown high energy selectivity with reasonable throughput. X-ray optical systems using multi-layers deposited on figured substrates have been used to focus x-rays from a conventional tube to micron-sized spots. Future x-ray spectrometers will likely take advantage of the energy selection and focusing capabilities of multi-layers as they become more readily available. Topics covered in this paper include the modification of spectral emissions from a conventional copper anode x-ray tube by a multi-layer, and multi-layer fabrication and characterization techniques as they apply to energy-dispersive x-ray spectrometry. RP BILTOFT, PJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT MECH ENGN,DIV MAT FABRICAT,VACUUM PROC GRP,LIVERMORE,CA 94550, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0049-8246 J9 X-RAY SPECTROM JI X-Ray Spectrom. PD JUL-AUG PY 1993 VL 22 IS 4 BP 293 EP 299 DI 10.1002/xrs.1300220422 PG 7 WC Spectroscopy SC Spectroscopy GA LQ042 UT WOS:A1993LQ04200021 ER PT J AU BUSSMANNHOLDER, A GENZEL, L SIMON, A BISHOP, AR AF BUSSMANNHOLDER, A GENZEL, L SIMON, A BISHOP, AR TI COOPERATIVE GAP COUPLING IN HIGH-T(C) SUPERCONDUCTIVITY SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID HIGH-TC SUPERCONDUCTORS; OXYGEN; TRANSITION; YBA2CU3O7 AB A unified approach to superconductivity is presented using natural extensions of weak coupling BCS theory. Multiphonon-multiband interactions cause a multigap opening at T(c), with cooperative pairing in all bands incorporated via interband interactions. Strong increases in T(c) are found due to interband-induced gap coupling. Model calculations for the experimentally observed gap distribution are presented. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP BUSSMANNHOLDER, A (reprint author), MAX PLANCK INST FESTKORPERFORSCH, HEISENBERGSTR 1, W-7000 STUTTGART 80, GERMANY. NR 27 TC 16 Z9 16 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD JUL PY 1993 VL 91 IS 3 BP 271 EP 276 DI 10.1007/BF01344055 PG 6 WC Physics, Condensed Matter SC Physics GA LH384 UT WOS:A1993LH38400002 ER PT J AU KEIMER, B BIRGENEAU, RJ CASSANHO, A ENDOH, Y GREVEN, M KASTNER, MA SHIRANE, G AF KEIMER, B BIRGENEAU, RJ CASSANHO, A ENDOH, Y GREVEN, M KASTNER, MA SHIRANE, G TI SOFT PHONON BEHAVIOR AND MAGNETISM AT THE LOW-TEMPERATURE STRUCTURAL PHASE-TRANSITION OF LA1.65ND0.35CUO4 SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID LATTICE INSTABILITY; NEUTRON-SCATTERING; LA2CUO4; SUPERCONDUCTIVITY; LA2NIO4+DELTA; EXCITATIONS AB We report a neutron scattering investigation of a La1.65Nd0.35CuO4 single crystal which undergoes a second order structural transition with decreasing temperature from a high temperature orthorhombic phase (space group Bmab) to a distinct low temperature orthorhombic phase (space group Pccn) at T(s) = 76 K. The transition is induced by the softening of the phonon mode that involves rotations of the tilt axis of the CuO6 octahedra. Antiferromagnetic long range order is established below T(N) = 316 K, and a hysteretic reorientation to a non-collinear spin structure occurs below T(s). The low energy spin dynamics of La1.65Nd0.35CuO4 above T(s) are closely similar to those of stoichiometric La2CuO4; at 100 K the gaps for in-plane and out-of-plane polarized spin waves are 2.3 meV and 5 meV, respectively. Out-of-plane polarized magnons are little affected by the structural transition, but the gap for in-plane polarized magnons increases markedly below T(s). C1 MIT, CTR MAT SCI & ENGN, CAMBRIDGE, MA 02139 USA. TOHOKU UNIV, DEPT PHYS, SENDAI, MIYAGI 980, JAPAN. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 31 TC 69 Z9 69 U1 1 U2 5 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD JUL PY 1993 VL 91 IS 3 BP 373 EP 382 DI 10.1007/BF01344067 PG 10 WC Physics, Condensed Matter SC Physics GA LH384 UT WOS:A1993LH38400014 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, A ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYPTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJG GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, H KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STRICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEY, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISIAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, A ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYPTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJG GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, H KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STRICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEY, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISIAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI DETERMINATION OF ALPHA-S USING THE NEXT-TO-LEADING-LOG APPROXIMATION OF QCD SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HADRONIC-Z-DECAYS; LUND MONTE-CARLO; ENERGY ENERGY CORRELATIONS; JET PRODUCTION-RATES; E+E-ANNIHILATION; RESONANCE; LEP; FRAGMENTATION; PHYSICS AB A new measurement of alpha(s), is obtained from the distributions in thrust, heavy jet mass, energy-energy correlation and two recently introduced jet broadening variables following a method proposed by Catani, Trentadue, Turnock and Webber. This method includes the full calculation of O(alpha(s)2) terms and leading and next-to-leading logarithms resummed to all orders of alpha(s). The analysis is based on data taken with the DELPHI detector at LEP during 1991. I its found that the inclusion of the resummed leading and next-to-leading logarithms reduces the scale dependence of alpha(s) and allows an extension of the fit range towards the infrared limit of the kinematical range. The combined value for alpha(s) obtained at the scale mu2 = M(Z)2 is: alpha(s)(M(Z)2)= 0.123 +/- 0.006. C1 UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,CNRS,IN2P3,PHYS CORPUSC LAB,F-75231 PARIS 05,FRANCE. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,CNRS,IN2P3,IPNL,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CNRS,IN2P3,CPP,F-13288 MARSEILLE 09,FRANCE. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. CHARLES UNIV,NUCL CTR MFF,NC,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DPTO FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. CTR ETUDE SACLAY,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE. INFN,I-00173 ROME,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. INFN,I-10125 TURIN,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV UDINE,INST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. CAS,DIV HIGH ENERGY PHYS,FZU,INST PHYS,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. JOINT NUCL RES INST,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV PARIS 11,CNRS,IN2P3,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. FCUL,IST,LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS VI & PARIS VII,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. U VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RI Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Andreazza, Attilio/E-5642-2011; de Groot, Nicolo/A-2675-2009; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Schulze, Bruno/B-7599-2008; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012 OI DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; De Lotto, Barbara/0000-0003-3624-4480; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Tome, Bernardo/0000-0002-7564-8392; Andreazza, Attilio/0000-0001-5161-5759; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Schulze, Bruno/0000-0002-3325-5785; Petrolini, Alessandro/0000-0003-0222-7594; NR 35 TC 46 Z9 46 U1 0 U2 10 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1993 VL 59 IS 1 BP 21 EP 33 PG 13 WC Physics, Particles & Fields SC Physics GA LN251 UT WOS:A1993LN25100002 ER PT J AU SORGE, H WINCKELMANN, LA STOCKER, H GREINER, W AF SORGE, H WINCKELMANN, LA STOCKER, H GREINER, W TI STRANGE PARTICLE-PRODUCTION IN PROTON-NUCLEUS REACTIONS AT ULTRARELATIVISTIC ENERGIES SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LAMBDA-BAR-PRODUCTION; SULFUR-TUNGSTEN INTERACTIONS; HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; LUND MONTE-CARLO; MULTIPARTICLE PRODUCTION; STREAMER CHAMBER; HADRON-NUCLEUS; 200 GEV/C; MODEL AB Enhanced yields of lambdas and other strange hadrons in experiments on nuclear targets at incident energies of 200 GeV have been recently reported by several experimental groups. We calculated events for proton projectiles on different targets in the framework of the relativistic quantum molecular dynamics approach which is based on string excitation and fragmentation with subsequent hadronic collisions. Here we address the question whether the experimentally found lambda enhancement in hadron-nucleus collisions can be understood by interactions of secondary hadrons formed in the target nucleus. Our results for LAMBDA's, kaons and LAMBDA'sBAR agree well with the experimental measurements. We find a doubling of lambda production in the target fragmentation region for p collisions on heavy targets due to nuclear cascading of the produced mesons. Resonances play an important role in creating strange quark pairs confirming earlier findings of their outstanding role in AA collisions. C1 UNIV FRANKFURT,W-6000 FRANKFURT,GERMANY. RP SORGE, H (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 53 TC 35 Z9 35 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JUL PY 1993 VL 59 IS 1 BP 85 EP 97 DI 10.1007/BF01555842 PG 13 WC Physics, Particles & Fields SC Physics GA LN251 UT WOS:A1993LN25100009 ER PT J AU HUD, NV ALLEN, MJ DOWNING, KH LEE, J BALHORN, R AF HUD, NV ALLEN, MJ DOWNING, KH LEE, J BALHORN, R TI IDENTIFICATION OF THE ELEMENTAL PACKING UNIT OF DNA IN MAMMALIAN SPERM CELLS BY ATOMIC-FORCE MICROSCOPY SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID CHROMATIN STRUCTURE; MOUSE SPERM; CONDENSATION; ULTRASTRUCTURE C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP HUD, NV (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550, USA. NR 18 TC 120 Z9 121 U1 1 U2 14 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUN 30 PY 1993 VL 193 IS 3 BP 1347 EP 1354 DI 10.1006/bbrc.1993.1773 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LJ912 UT WOS:A1993LJ91200077 PM 8323555 ER PT J AU CHEN, J CHRISTIANSEN, J TITTSWORTH, RC HALES, BJ GEORGE, SJ COUCOUVANIS, D CRAMER, SP AF CHEN, J CHRISTIANSEN, J TITTSWORTH, RC HALES, BJ GEORGE, SJ COUCOUVANIS, D CRAMER, SP TI IRON EXAFS OF AZOTOBACTER-VINELANDII NITROGENASE MO-FE AND V-FE PROTEINS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID X-RAY-ABSORPTION; VANADIUM NITROGENASE; MOLYBDENUM COFACTOR; STRUCTURAL CHARACTERIZATION; ALTERNATIVE NITROGENASE; STEPWISE SYNTHESIS; DOUBLE CUBANES; FINE-STRUCTURE; FE/MO/S SITE; VFE-PROTEIN AB The structure of the iron sites of nitrogenase in dithionite-reduced and thionine-oxidized forms of the Mo-Fe and V-Fe proteins has been investigated using Fe K-edge X-ray absorption spectroscopy. For the dithionite-reduced Azotobacter vinelandii Mo-Fe protein, the dominant EXAFS Fourier transform peaks are assigned to Fe-S and Fe-Fe interactions at approximately 2.32 and 2.64 angstrom, as expected for Fe-S clusters. An additional Fe-Mo component at 2.73 angstrom is required to completely fit the EXAFS in the 1-3-angstrom region. In the 3-5-angstrom region, a 3.8-angstrom Fe-Fe component is identified, with an amplitude corresponding to almost one long Fe-Fe interaction, averaged over all of the iron in the sample. Features that can be explained as Fe-S and Fe-Fe interactions at 4.3 and 4.7 angstrom are also observed. A similar pattern of Fe interactions is observed for the reduced A. vinelandii V-Fe protein, except that the short Fe-Mo interaction is no longer required. In both Mo-Fe and V-Fe proteins, the first coordination sphere Fe-S distances contract slightly upon thionine oxidation. The long-range Fe-S and Fe-Fe interactions are very close (within 0.1 angstrom) to corresponding distances in Fe6S6 prismane clusters. If the amplitudes are adjusted by assuming that only 14 of 30 nitrogenase irons participate in the M center, then they are consistent with recently proposed crystallographic models. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109. LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. NR 48 TC 78 Z9 80 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5509 EP 5515 DI 10.1021/ja00066a019 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200019 ER PT J AU NORDLANDER, E LEE, SC CEN, W WU, ZY NATOLI, CR DICICCO, A FILIPPONI, A HEDMAN, B HODGSON, KO HOLM, RH AF NORDLANDER, E LEE, SC CEN, W WU, ZY NATOLI, CR DICICCO, A FILIPPONI, A HEDMAN, B HODGSON, KO HOLM, RH TI HETEROMETAL CUBOIDAL CLUSTERS MFE4S6(PET3)4CL (M = V, MO) - SYNTHESIS, STRUCTURAL-ANALYSIS BY CRYSTALLOGRAPHY AND EXAFS, AND RELEVANCE TO THE CORE STRUCTURE OF THE IRON MOLYBDENUM COFACTOR OF NITROGENASE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID X-RAY-ABSORPTION; AZOTOBACTER-VINELANDII FERREDOXIN; MULTIPLE-SCATTERING THEORY; FINE-STRUCTURE; KLEBSIELLA-PNEUMONIAE; DESULFOVIBRIO-GIGAS; SULFUR CLUSTERS; CRYSTAL-STRUCTURES; BASKET CLUSTERS; 3FE-4S CLUSTER AB The cluster self-assembly system MCl3(THF)3/2FeCl2(PEt3)2/4-7(Me3Si)2S affords, after separation of cluster coproducts, the isomorphous compounds MFe4S6(PEt3)4Cl (M = V, Mo) in modest yields. These species were identified by spectroscopic methods and X-ray diffraction. The compounds crystallize in trigonal space group R3cBAR; the cluster molecules are isostructural and essentially isometric. They consist of a cuboidal Fe4S3 fragment that is bridged by three mu2-S atoms to a M-PEt3 unit whose M-P bond is coincident with an imposed C3 axis. Coordination is completed at the three symmetry-related Fe sites by PEt3 ligands and at the Fe site on the C3 axis by chloride. The trigonal pyramidal coordination units FeS3P and MoS3P are infrequently observed and unprecedented, respectively, and the cuboidal fragment has been observed previously only in several Fe-S-nitrosyl clusters. The cluster structure presents atoms at a series of distances from the M or Fe atoms and has been utilized in a detailed test of distance determinations in a new approach to the analysis of EXAFS data using theoretical phases and amplitudes (the GNXAS approach). The Mo and Fe EXAFS of the cluster MoFe4S6(PEt3)4Cl have been analyzed in detail and first coordination shell distances determined with high accuracy. The contribution of multiple scattering pathways in the EXAFS of the cluster has been evaluated. The relevance of the results to the FeMo-cofactor structure as recently deduced from protein crystallography is considered. C1 HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138. LAB NAZL FRASCATI,INFN,I-00044 FRASCATI,ITALY. UNIV CAMERINO,DIPARTIMENTO MATEMAT & FIS,I-62032 CAMERINO,ITALY. UNIV AQUILA,DIPARTIMENTO FIS,I-67010 COPPITO AQUILA,ITALY. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. RI Filipponi, Adriano/P-7796-2015 OI Filipponi, Adriano/0000-0002-3870-5853 NR 86 TC 63 Z9 63 U1 2 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5549 EP 5558 DI 10.1021/ja00066a024 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200024 ER PT J AU JOHNSON, DG NIEMCZYK, MP MINSEK, DW WIEDERRECHT, GP SVEC, WA GAINES, GL WASIELEWSKI, MR AF JOHNSON, DG NIEMCZYK, MP MINSEK, DW WIEDERRECHT, GP SVEC, WA GAINES, GL WASIELEWSKI, MR TI PHOTOCHEMICAL ELECTRON-TRANSFER IN CHLOROPHYLL PORPHYRIN QUINONE TRIADS - THE ROLE OF THE PORPHYRIN-BRIDGING MOLECULE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; PRIMARY CHARGE SEPARATION; RHODOPSEUDOMONAS-SPHAEROIDES R-26; POLARITY DEPENDENT PHOTOPHYSICS; BACTERIAL REACTION CENTERS; FEMTOSECOND SPECTROSCOPY; ACCEPTOR MOLECULES; ZINC PORPHYRIN; EXCITED-STATES; DISTANCE AB The photochemistry of four chlorophyll-porphyrin-naphthoquinone molecules possessing both fixed distances and orientations between the three components is described. These molecules consist of a methyl pyropheophorbide a or pyrochlorophyllide a that is directly bonded at its 3-position to the 5-position of a 2,8,12,18-tetraethyl-3,7,13,-17-tetramethylporphyrin, which is in turn bonded at its 15-position to a 2-triptycenenaphthoquinone. In addition, porphyrin-quinone compounds in which the chlorins are replaced by a p-tolyl group were also prepared as reference compounds. Selective metalation of the macrocycles with zinc gives the series ZCHPNQ, ZCZPNQ, HCZPNQ, HCHPNQ, HPNQ, and ZPNQ, where H, Z, C, P, and NQ denote free base, Zn derivative, chlorophyll, porphyrin, and naphthoquinone, respectively. Selective excitation of ZC in ZCZPNQ and ZCHPNQ, and HC in HCHPNQ dissolved in butyronitrile yields ZC+ZPNQ-, ZC+HPNQ-, and HC+HPNQ- with rate constants of 1.0 X 10(11), 9.0 X 10(9), and 8.2 x 10(9) s-1, respectively, while the corresponding ion-pair recombination rate constants are 1.4 x 10(10), 4.0 X 10(9), and 4.0 x 10(9) s-1, respectively. The fact that ZCZPNQ possesses faster rates of charge separation than do ZCHPNQ and HCHPNQ is inconsistent with an electron transfer mechanism involving superexchange with virtual states possessing anionic character on the bridging porphyrin. The data support an electron transfer mechanism in which the lowest excited singlet state of the bridging porphyrin weakly mixes with the lowest excited singlet state of the chlorophyll. This mixed state crosses over to a charge transfer state in which the bridging porphyrin is oxidized and the quinone is reduced. This charge transfer state then relaxes to yield the final state which possesses an oxidized chlorophyll and a reduced quinone. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 56 TC 109 Z9 110 U1 0 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5692 EP 5701 DI 10.1021/ja00066a039 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200039 ER PT J AU KRAUS, GA LI, J GORDON, MS JENSEN, JH AF KRAUS, GA LI, J GORDON, MS JENSEN, JH TI REGIOCONTROL BY REMOTE SUBSTITUENTS - AN ENANTIOSELECTIVE TOTAL SYNTHESIS OF FRENOLICIN-B VIA A HIGHLY REGIOSELECTIVE DIELS-ALDER REACTION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CYCLO-ADDITIONS; AKLAVINONE C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP KRAUS, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. RI Jensen, Jan/G-4338-2010 OI Jensen, Jan/0000-0002-1465-1010 NR 23 TC 55 Z9 55 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5859 EP 5860 DI 10.1021/ja00066a078 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200078 ER PT J AU LIGHTWAHL, KJ WINGER, BE SMITH, RD AF LIGHTWAHL, KJ WINGER, BE SMITH, RD TI OBSERVATION OF THE MULTIMERIC FORMS OF CONCANAVALIN-A BY ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CONFORMATIONAL-CHANGES; PROTEINS; POLYPEPTIDES; PRINCIPLES; COMPLEXES; SUBSTRATE; EXCHANGE; SPECTRA C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 31 TC 53 Z9 54 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5869 EP 5870 DI 10.1021/ja00066a083 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200083 ER PT J AU TUINMAN, AA GAKH, AA ADCOCK, JL COMPTON, RN AF TUINMAN, AA GAKH, AA ADCOCK, JL COMPTON, RN TI HYPERFLUORINATION OF BUCKMINSTERFULLERENE - CRACKING THE SPHERE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID FLUORINATED FULLERENES C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. NR 10 TC 59 Z9 59 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 30 PY 1993 VL 115 IS 13 BP 5885 EP 5886 DI 10.1021/ja00066a091 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT172 UT WOS:A1993LT17200091 ER PT J AU BRONOLD, F SAXENA, A BISHOP, AR AF BRONOLD, F SAXENA, A BISHOP, AR TI INTERCHAIN COUPLING AND 3D MODELING OF TRANSPOLYACETYLENE SO PHYSICA D LA English DT Article; Proceedings Paper CT 12TH ANNUAL INTERNATIONAL CONF OF THE LOS ALAMOS NATIONAL LABORATORY CENTER FOR NONLINEAR STUDIES : NONLINEARITY IN MATERIALS SCIENCE CY MAY 18-22, 1992 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB CTR NONLINEAR STUDIES, US DOE, OFF SCI COMP ID DOPED POLYACETYLENE; SOLITONS; POLYMERS; ORDER AB In spite of the success of the SSH model for trans-polyacetylene in interpreting many experimental results (e.g. optical and magnetic proper-ties) there remain some aspects of the real material which are outside the scope of the simple one-dimensional (1D) model. In particular, ordering phenomena of doped and undoped trans-polyacetylene as well as transport properties (e.g. electronic and thermal conductivity) are beyond a 1D description. There have been many attempts to construct a transport theory for this novel class of materials using solitons or polarons as the basic ingredients. But so far it is not yet clear whether these typical 1D excitations still exist in crystalline trans-polyacetylene. Therefore, to clarify the role which intrinsic self-localized nonlinear excitations characteristic of 1D models play in the bulk (3D) material, we study the stability of a polaronic excitation against interchain coupling. As a preliminary step we consider first two coupled t-(CH)x-chains where the pi-electrons are allowed to hop from one chain to the other. Then we introduce a 3D generalization of the SSH model and study a polaron in a 3D crystalline environment. Our results point to the likely importance of local inhomogeneities in crystalline order for real polyacetylene and related conducting polymers. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV BAYREUTH,INST PHYS,W-8580 BAYREUTH,GERMANY. RP BRONOLD, F (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP 14 EP 25 DI 10.1016/0167-2789(93)90219-Q PG 12 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800004 ER PT J AU DAUXOIS, T PEYRARD, M BISHOP, AR AF DAUXOIS, T PEYRARD, M BISHOP, AR TI THERMODYNAMICS OF A NONLINEAR MODEL FOR DNA DENATURATION SO PHYSICA D LA English DT Article; Proceedings Paper CT 12TH ANNUAL INTERNATIONAL CONF OF THE LOS ALAMOS NATIONAL LABORATORY CENTER FOR NONLINEAR STUDIES : NONLINEARITY IN MATERIALS SCIENCE CY MAY 18-22, 1992 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB CTR NONLINEAR STUDIES, US DOE, OFF SCI COMP ID STATISTICAL-MECHANICS; SOLITONS; DYNAMICS AB We study a model for the dynamical stretching of DNA which uses the stretching of the hydrogen bonds in a base-pair as its main variable. We present a statistical mechanical analysis of the denaturation and specific heat curves, obtained with the transfer integral method; discreteness effects are treated exactly by a numerical solution of the transfer integral operator. Second order self-consistent phonon theory agrees with the exact transfer integral results in the low and intermediate temperature range and explains the phonon softening observed in the molecular dynamics simulations. When the temperature approaches the denaturation temperature, the second order self-consistent phonon results deviate significantly from the exact ones, pointing to the fundamental role of nonlinear processes in DNA denaturation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. ENS LYON,F-69007 LYON,FRANCE. RP DAUXOIS, T (reprint author), FAC SCI DIJON,F-21000 DIJON,FRANCE. RI PEYRARD, Michel/C-8494-2014 NR 23 TC 19 Z9 19 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP 35 EP 42 DI 10.1016/0167-2789(93)90221-L PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800006 ER PT J AU LOMDAHL, PS AF LOMDAHL, PS TI DATA-PARALLEL LANGEVIN DYNAMICS SIMULATIONS OF SURFACE GROWTH SO PHYSICA D LA English DT Article; Proceedings Paper CT 12TH ANNUAL INTERNATIONAL CONF OF THE LOS ALAMOS NATIONAL LABORATORY CENTER FOR NONLINEAR STUDIES : NONLINEARITY IN MATERIALS SCIENCE CY MAY 18-22, 1992 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB CTR NONLINEAR STUDIES, US DOE, OFF SCI COMP AB The basic principles of data-parallel programming on massively parallel computers are outlined and illustrated with examples from Langevin dynamics simulations of surface growth in the presence of dislocation defects. C1 LOS ALAMOS NATL LAB,ADV COMP LAB,LOS ALAMOS,NM 87545. RP LOMDAHL, PS (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP 119 EP 124 DI 10.1016/0167-2789(93)90229-T PG 6 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800014 ER PT J AU SAXENA, A BARSCH, GR AF SAXENA, A BARSCH, GR TI PRETRANSFORMATION STRAIN MODULATIONS IN PROPER FERROELASTICS SO PHYSICA D LA English DT Article; Proceedings Paper CT 12TH ANNUAL INTERNATIONAL CONF OF THE LOS ALAMOS NATIONAL LABORATORY CENTER FOR NONLINEAR STUDIES : NONLINEARITY IN MATERIALS SCIENCE CY MAY 18-22, 1992 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB CTR NONLINEAR STUDIES, US DOE, OFF SCI COMP ID FE-PD ALLOY; MARTENSITIC PHASE-TRANSITION; FCC-FCT TRANSFORMATION; PRECURSOR PHENOMENA; SCATTERING; DYNAMICS; SYSTEMS AB Within the framework of the Landau-Ginzburg model for the O(h)-D4h proper ferroelastic transformation pretransformation structural modulations may arise as (possibly defect-stabilized) pseudo-critical fluctuations that can be described by an effective elaStiC phi4 model. Here we show that the strain amplitude and temperature dependence of an intermediate tetragonal phase observed above and concurrently with the face-centered cubic to face-centered tetragonal transition in Fe0.7Pd0.3 can be understood semi-quantitatively in terms of the crossover behavior from the Ising to the displacive limit by applying the crossover phase diagram of Beale, Sarker and Krumhansl (obtained from a renormalization group study of structural phase transitions in ID and 2D) to the effective phi4 model. The fact that this type of pretransformation modulation has not been observed with X-rays for other ferroelastic transformations (e.g. In-TI alloys) can be attributed to large values of the order parameter gradient coefficient in these cases. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SAXENA, A (reprint author), PENN STATE UNIV,MAT RES LAB,UNIV PK,PA 16802, USA. NR 38 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP 195 EP 204 DI 10.1016/0167-2789(93)90238-V PG 10 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800023 ER PT J AU BISHOP, A ECKE, R GUBERNATIS, J AF BISHOP, A ECKE, R GUBERNATIS, J TI NONLINEARITY IN MATERIALS SCIENCE - PROCEEDINGS OF THE 12TH ANNUAL INTERNATIONAL-CONFERENCE OF THE CENTER-FOR-NONLINEAR-STUDIES LOS-ALAMOS, NM 18-22 MAY 1992 - PREFACE SO PHYSICA D LA English DT Editorial Material RP BISHOP, A (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP R7 EP R7 DI 10.1016/0167-2789(93)90216-N PG 1 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800001 ER PT J AU RAISTRICK, I HAWLEY, M AF RAISTRICK, I HAWLEY, M TI MESOSCALE STRUCTURAL STUDIES OF THIN-FILMS OF YBA2CU3O7 SO PHYSICA D-NONLINEAR PHENOMENA LA English DT Article ID SINGLE-CRYSTAL MGO; HETEROEPITACTIC GROWTH; MICROSTRUCTURE; MECHANISM; INSITU AB The surface morphology and growth mechanism of thin films of YBa2Cu3O7 on a variety of single crystal substrates has been investigated using scanning tunneling microscopy. Over a wide range of deposition conditions c-axis films nucleate as islands and grow by a dislocation-mediated mechanism (spiral growth). a-axis films, on the other hand, grow by edge addition of vapor phase material to the component layers, giving a very different morphology. Many defect features associated with these growth patterns have been been observed and their dependence on deposition conditions and substrate material, as well as their importance for some superconducting properties is discussed. RP RAISTRICK, I (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 EI 1872-8022 J9 PHYSICA D JI Physica D PD JUN 30 PY 1993 VL 66 IS 1-2 BP 172 EP 179 DI 10.1016/0167-2789(93)90235-S PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LM898 UT WOS:A1993LM89800020 ER PT J AU MOSESSON, MW DIORIO, JP SIEBENLIST, KR WALL, JS HAINFELD, JF AF MOSESSON, MW DIORIO, JP SIEBENLIST, KR WALL, JS HAINFELD, JF TI THE TRIMOLECULAR JUNCTION - A UNIQUE 2ND MECHANISM FOR FIBRIN CLOT NETWORK BRANCHING SO THROMBOSIS AND HAEMOSTASIS LA English DT Meeting Abstract C1 UNIV WISCONSIN,SINAI SAMARITAN MED CTR,SCH MED,MILWAUKEE,WI 53201. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU F K SCHATTAUER VERLAG GMBH PI STUTTGART PA P O BOX 10 45 45, LENZHALDE 3, D-70040 STUTTGART, GERMANY SN 0340-6245 J9 THROMB HAEMOSTASIS JI Thromb. Haemost. PD JUN 30 PY 1993 VL 69 IS 6 BP 987 EP 987 PG 1 WC Hematology; Peripheral Vascular Disease SC Hematology; Cardiovascular System & Cardiology GA LT577 UT WOS:A1993LT57701596 ER PT J AU SCHULTZ, PA DAVENPORT, JW AF SCHULTZ, PA DAVENPORT, JW TI CALCULATIONS OF SYSTEMATICS IN B2 STRUCTURE 3D TRANSITION-METAL ALUMINIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON REGULARITIES, CLASSIFICATIONS AND PREDICTION OF ADVANCED MATERIALS CY APR 13-15, 1992 CL CTR CULTURA SCI A VOLTA, COMO, ITALY SP USN, OFF NAVAL RES EUROPEAN OFF, IBM ITALY, EUROPEAN INST TECHNOL, ICSU, COMM DATA SCI & TECHNOL, UNIV TOKYO, UNIV TORINO, NIST, CNR, ASM INT HO CTR CULTURA SCI A VOLTA ID ELECTRONIC-STRUCTURE CALCULATIONS; CHARGE-TRANSFER; ORBITAL METHOD; INTERMETALLIC COMPOUNDS; HYDROGEN EMBRITTLEMENT; COHESIVE PROPERTIES; BAND-STRUCTURE; ALLOYS; FEAL; DENSITY AB An all-electron total energy local density functional approach was used to examine features in the electronic structure of B2 structure transition metal aluminides that are possible factors affecting brittleness in these intermetallics. Noting that iron, cobalt and nickel all form stable aluminides with nearly identical lattice parameters, yet manifest different physical properties, we compared calculated results for B2 FeAl, CoAl, NiAl and CuAl, with an eye toward elucidating those features that correlate with the observed physical properties. The first-principles calculations accurately reproduced the formation energies of these compounds. Detailed analyses of the results explicitly demonstrated that factors commonly associated with bonding and brittleness in intermetallics-valency, ionicity and directional bonding-cannot in fact be the critical factors governing the behavior of these materials. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SCHULTZ, PA (reprint author), GE CO,CORP RES & DEV,SCHENECTADY,NY 12301, USA. NR 74 TC 36 Z9 36 U1 2 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD JUN 29 PY 1993 VL 197 IS 2 BP 229 EP 242 DI 10.1016/0925-8388(93)90045-O PG 14 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA LK231 UT WOS:A1993LK23100013 ER PT J AU BENNETT, LH WATSON, RE AF BENNETT, LH WATSON, RE TI LOCAL ATOMIC ENVIRONMENTS OF HARD MAGNETS, METALLIC GLASSES, AND ICOSAHEDRAL PHASES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON REGULARITIES, CLASSIFICATIONS AND PREDICTION OF ADVANCED MATERIALS CY APR 13-15, 1992 CL CTR CULTURA SCI A VOLTA, COMO, ITALY SP USN, OFF NAVAL RES EUROPEAN OFF, IBM ITALY, EUROPEAN INST TECHNOL, ICSU, COMM DATA SCI & TECHNOL, UNIV TOKYO, UNIV TORINO, NIST, CNR, ASM INT HO CTR CULTURA SCI A VOLTA ID DISCLINATIONS; ALLOYS; ANISOTROPIES; SYMMETRY AB Voronoi polyhedra furnish a useful measure of the local environment of an atom, including a description of the site symmetry of the atom, and a catalog of what atoms constitute its nearest neighbors. A modified Voronoi construction also accounts for the relative sizes of the various atoms. Several applications of such polyhedra are presented, including magnetic moments and anisotropies in hard magnets, polymorphism in metallic glasses, local environments in quasicrystals, and supersymmetry in alphaMn. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BENNETT, LH (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 27 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD JUN 29 PY 1993 VL 197 IS 2 BP 271 EP 280 DI 10.1016/0925-8388(93)90047-Q PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA LK231 UT WOS:A1993LK23100015 ER PT J AU XU, L HU, BB XIN, W AUSTON, DH MORSE, JD AF XU, L HU, BB XIN, W AUSTON, DH MORSE, JD TI HOT-ELECTRON DYNAMICS STUDY BY TERAHERTZ RADIATION FROM LARGE-APERTURE GAAS P-I-N-DIODES SO APPLIED PHYSICS LETTERS LA English DT Article ID GALLIUM-ARSENIDE; OVERSHOOT AB Subpicosecond electromagnetic pulses having tetrahertz (THz) bandwidths have been generated from large aperture GaAs p-i-n diodes under bias by illumination with femtosecond optical pulses. The amplitude and shape of the radiated pulses change with the applied bias and the wavelength of the optical pulses illuminating the p-i-n diode. Comparing this radiation with THz radiation from large aperture Si p-i-n diodes provides evidence of velocity overshoot in the transient response of optically injected electrons in GaAs. C1 LAWRENCE LIVERMORE NATL LAB,OPT & ELECTR DEVICES GRP,LIVERMORE,CA 94550. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 28 PY 1993 VL 62 IS 26 BP 3507 EP 3509 DI 10.1063/1.109010 PG 3 WC Physics, Applied SC Physics GA LJ888 UT WOS:A1993LJ88800040 ER PT J AU BAKER, GA GRAVESMORRIS, PR AF BAKER, GA GRAVESMORRIS, PR TI DETERMINANTS AND THE STRUCTURE OF THE INTEGRAL APPROXIMANT TABLE SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE HERMITE-PADE APPROXIMANT; INTEGRAL APPROXIMANT; DIFFERENTIAL APPROXIMANT; PADE APPROXIMANT; DIFFERENTIAL EQUATIONS AB The structure of the table of integral approximants based on our minimality definition is studied. The key elements are simplices containing only a single linearly independent solution for the integral polynomials. We prove some new identities among determinants of the coefficients of the determining equations for integral polynomials of different types. Relations between the simplices and these determinants are also derived. We give determinantal conditions which are both necessary and sufficient for a full simplex to contain just one approximant. A nullity lemma is proved limiting the change between contiguous types in the number of linearly independent solutions for integral polynomials. Virtually all of our results are equally valid for the more general case of the Hermite-Pade approximants of the Latin type. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87544. UNIV BRADFORD,DEPT MATH,BRADFORD BD7 1DP,W YORKSHIRE,ENGLAND. NR 13 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 28 PY 1993 VL 47 IS 1 BP 67 EP 81 DI 10.1016/0377-0427(93)90091-O PG 15 WC Mathematics, Applied SC Mathematics GA LK564 UT WOS:A1993LK56400006 ER PT J AU ANDRIOTIS, AN ECONOMOU, EN SOUKOULIS, CM AF ANDRIOTIS, AN ECONOMOU, EN SOUKOULIS, CM TI LOCAL SPIN CLUSTERING AND PHASE-SEPARATION IN THE HUBBARD-MODEL SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ONE-BODY APPROXIMATION; T-J MODEL; MAGNETISM AB We use an unrestricted self-consistent mean-field approach to the one-dimensional periodic Hubbard model to study its ground-state phase diagram. Our approach allows one to incorporate spin and electron correlations as well as spin and charge fluctuations. We find that a homogeneous antiferromangetic state exists only at half-filling, where the state is also insulating. Off half-filling, it was found that the ground state of the Hubbard model consists of clusters with different magnetic and charge properties. For certain values of the parameters of the system the cluster formation develops to a full phase separation. The effects of the intersite repulsive or attractive interaction on the ground-state properties were also examined. Implications of our results for the existence of a superconducting ground state as well as comparison with other studies will be briefly discussed. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV CRETE,DEPT PHYS,GR-71110 IRAKLION,GREECE. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP ANDRIOTIS, AN (reprint author), UNIV CRETE,RES CTR CRETE,POB 1527,GR-71110 IRAKLION,GREECE. RI Economou, Eleftherios /E-6374-2010; Andriotis, Antonios/A-2848-2014; Soukoulis, Costas/A-5295-2008 NR 27 TC 7 Z9 7 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 28 PY 1993 VL 5 IS 26 BP 4505 EP 4518 DI 10.1088/0953-8984/5/26/021 PG 14 WC Physics, Condensed Matter SC Physics GA LK741 UT WOS:A1993LK74100021 ER PT J AU OLSSON, N CONDE, H RAMSTROM, E RONNQVIST, T ZORRO, R BLOMGREN, J HAKANSSON, A TIBELL, G JONSSON, O NILSSON, L RENBERG, PU BROCKSTEDT, A EKSTROM, P OSTERLUND, M VANDERWERF, SY MILLENER, DJ SZEFLINSKA, G SZEFLINSKI, Z AF OLSSON, N CONDE, H RAMSTROM, E RONNQVIST, T ZORRO, R BLOMGREN, J HAKANSSON, A TIBELL, G JONSSON, O NILSSON, L RENBERG, PU BROCKSTEDT, A EKSTROM, P OSTERLUND, M VANDERWERF, SY MILLENER, DJ SZEFLINSKA, G SZEFLINSKI, Z TI THE C-12(N,P)B-12 REACTION AT E(N)=98 MEV SO NUCLEAR PHYSICS A LA English DT Article DE C-12(N, P); E = 98 MEV; MEASURED SIGMA(E(P),THETA); THETA=0-DEGREES-33-DEGREES; B-12 DEDUCED DELTA-L=0-3 MULTIPLE STRENGTH DISTRIBUTIONS; DWBA CALCULATIONS, MULTIPOLE DECOMPOSITION ID GAMOW-TELLER STRENGTH; CHARGE-EXCHANGE REACTIONS; BETA-DECAY; ANALYZING POWER; LIGHT-NUCLEI; N,P REACTION; C-12(P,N)N-12 REACTION; INTERMEDIATE ENERGIES; ELECTRON-SCATTERING; SPIN CONTRIBUTIONS AB Double-differential cross sections of the C-12(n, p) reaction have been measured at 98 MeV in the angular range 0-degrees-33-degrees for excitation energies up to 35 MeV. The spectra have been analysed in terms of multipole components, using peak fitting and decomposition techniques. The data have been compared with cross sections obtained in the distorted-wave Born approximation, using matrix elements from shell-model calculations. The unit cross section and the related strength of the spin-isospin part of the nucleon-nucleon interaction were determined from the extracted Gamow-Teller strength. Cross sections and fractions of strength exhausted by dipole and higher-multipole transitions were extracted and compared with data available in the literature. C1 UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV UPPSALA,SVEDBERG LAB,S-75121 UPPSALA,SWEDEN. LUND UNIV,DEPT PHYS,S-22362 LUND,SWEDEN. KERNFYS VERSNELLER INST,9747 AA GRONINGEN,NETHERLANDS. UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP OLSSON, N (reprint author), UNIV UPPSALA,DEPT NEUTRON RES,POB 535,S-75121 UPPSALA,SWEDEN. NR 62 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 28 PY 1993 VL 559 IS 3 BP 368 EP 400 DI 10.1016/0375-9474(93)90159-U PG 33 WC Physics, Nuclear SC Physics GA LU497 UT WOS:A1993LU49700004 ER PT J AU WADSWORTH, R ANDREWS, HR CLARK, RM FOSSAN, DB GALINDOURIBARRI, A HUGHES, JR JANZEN, VP LAFOSSE, DR MULLINS, SM PAUL, ES RADFORD, DC SCHNARE, H VASKA, P WARD, D WILSON, JN WYSS, R AF WADSWORTH, R ANDREWS, HR CLARK, RM FOSSAN, DB GALINDOURIBARRI, A HUGHES, JR JANZEN, VP LAFOSSE, DR MULLINS, SM PAUL, ES RADFORD, DC SCHNARE, H VASKA, P WARD, D WILSON, JN WYSS, R TI INTRUDER BANDS IN SN-108 SO NUCLEAR PHYSICS A LA English DT Article DE FE-54(NI-58,4P); E = 243 MEV; MEASURED E-GAMMA(THETA); SN-108 DEDUCED LEVELS; J, PI; BAND STRUCTURE; QUADRUPOLE MOMENT; COMPARISON WITH TRS AND WOODS-SAXON CALCULATIONS; ENRICHED TARGETS; GE DETECTORS; BGO SUPPRESSION SHIELDS ID QUADRUPOLE-MOMENTS; MASS REGION; STATES; NUCLEI; SHELL AB The nucleus 108Sn has been populated via the Fe-54(Ni-58, 4p) reaction channel at a beam energy of 243 MeV. The high-spin structure is dominated by three DELTAI = 2 rotational sequences. These bands can be interpreted in terms of particle-hole excitations involving the proton g7/2, g9/2 and h11/2 orbitals and also aligned neutrons from the bottom of the h11/2 shell. Lifetime measurements have also been performed using the Doppler-shift attenuation method. These data have enabled quadrupole moments to be deduced for the two strongest bands. The results yield Q0 = 2.6 +/- 0.4 e . b for the positive-parity band and 3.4 +/- 0.6 e . b for one of the proposed negative-parity bands. These values yield quadrupole deformations of beta2 = 0.20 and 0.26, respectively, for the two bands. The results obtained are discussed in terms of Woods-Saxon and total routhian surface calculations. C1 AECL RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ON,CANADA. SUNY,DEPT PHYS,STONY BROOK,NY 11794. MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON L8S 4M1,ONTARIO,CANADA. UNIV LIVERPOOL,OLIVER LODGE LAB,LIVERPOOL L69 3BX,ENGLAND. OAK RIDGE NATL LAB,JIHIR,OAK RIDGE,TN 37831. RP WADSWORTH, R (reprint author), UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. RI radford, David/A-3928-2015 NR 20 TC 67 Z9 67 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 28 PY 1993 VL 559 IS 3 BP 461 EP 476 DI 10.1016/0375-9474(93)90163-R PG 16 WC Physics, Nuclear SC Physics GA LU497 UT WOS:A1993LU49700008 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMAN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMAN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF JET MULTIPLICITY IN W-EVENTS PRODUCED IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID PBARP COLLISIONS; HADRON COLLIDERS; BOSON AB The W production cross section times the branching ratio for W-->lnu, l=e,mu decays has been measured as a function of the associated jet multiplicity. The data have been recorded at the Collider Detector at Fermilab during the 1988-89 run. A recent leading order QCD calculation agrees well with the data up to a jet multiplicity of 4. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. DUKE UNIV, DURHAM, NC 27706 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. MCGILL UNIV, INST PARTICLE PHYS, MONTREAL H3A 2T5, QUEBEC, CANADA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV TORONTO, TORONTO M5S 1A1, ONTARIO, CANADA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. UNIV NEW MEXICO, ALBUQUERQUE, NM 87131 USA. UNIV PADUA, IST NAZL FIS NUCL, I-35131 PADUA, ITALY. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PITTSBURGH, PITTSBURGH, PA 15260 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS UNIV, PISCATAWAY, NJ 08854 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS, OHO, IBARAKI 305, JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; NR 12 TC 14 Z9 14 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4042 EP 4050 DI 10.1103/PhysRevLett.70.4042 PG 9 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700004 ER PT J AU THOENNESSEN, M BEENE Jr BERTRAND, FE BAKTASH, C HALBERT, ML HOREN, DJ SARANTITES, DG SPANG, W STRACENER, DW AF THOENNESSEN, M BEENE, JR BERTRAND, FE BAKTASH, C HALBERT, ML HOREN, DJ SARANTITES, DG SPANG, W STRACENER, DW TI EVIDENCE FOR LONG FORMATION TIMES OF NEAR-BARRIER FUSION REACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID GIANT-DIPOLE RESONANCE; DECAY; FISSION AB High energy gamma rays from the decay of the giant dipole resonance built on highly excited states in 164Yb at E(ex) = 49 MeV formed in two different reactions have been measured. While standard statistical model calculations can describe the gamma-ray spectrum from the O-16 + Sm-148 reaction they fail to reproduce the gamma-ray spectra from the more symmetric reaction 64Ni + Mo-100. Simple model calculations which include particle evaporation and gamma-ray decay during the formation process suggest that the observed differences may be related to a long fusion time in the more symmetric reaction. C1 MICHIGAN STATE UNIV, NATL SUPERCONDUCTING CYCLOTRON LAB, E LANSING, MI 48824 USA. WASHINGTON UNIV, DEPT CHEM, ST LOUIS, MO 63130 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST KERNPHYS, W-5170 JULICH, GERMANY. MICHIGAN STATE UNIV, DEPT PHYS & ASTRON, E LANSING, MI 48824 USA. RP THOENNESSEN, M (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 16 TC 55 Z9 55 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4055 EP 4058 DI 10.1103/PhysRevLett.70.4055 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700007 ER PT J AU GARRETT, WR AF GARRETT, WR TI FORWARD GAIN SUPPRESSION OF OPTICALLY PUMPED STIMULATED EMISSIONS DUE TO SELF-INDUCED WAVE-MIXING INTERFERENCE DURING A PUMP PULSE SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTI-PHOTON IONIZATION; MULTIPHOTON IONIZATION; 3-PHOTON RESONANCE; 3RD-HARMONIC GENERATION; EXCITATION; SHIFTS; XE; XENON AB Theoretical and experimental presentations are given of a drastic suppression, during the interval of the excitation pulse, of forward-directed optically pumped stimulated emission from a two-photon resonantly excited state to a lower state which is also coupled to the ground state. The effect is caused by a self-induced interference from the difference-frequency mixing field that is generated during the time that the excitation fields are present. Several other implications of this effect are given and some puzzling observations in other studies are noted and clarified. RP GARRETT, WR (reprint author), OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831, USA. NR 19 TC 28 Z9 28 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4059 EP 4062 DI 10.1103/PhysRevLett.70.4059 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700008 ER PT J AU GOLDMAN, MV NEWMAN, DL PERKINS, FW AF GOLDMAN, MV NEWMAN, DL PERKINS, FW TI FLUID CLOSURES WHICH MIMIC WAVE-PARTICLE INTERACTIONS IN STRONG LANGMUIR TURBULENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLASMA AB A new two-time-scale model of strong Langmuir turbulence has been constructed, using higher-moment fluid equations with dissipative closures designed to better simulate Vlasov theory predictions of linear wave properties, and to treat collisionless heating of particles by waves. Numerical solutions are carried out in a study of electron heating associated with collapse and burnout of a large-amplitude initial Langmuir wave and in a study of radiation-driven Langmuir turbulence interacting with ion-acoustic quasimodes in plasmas with T(e) almost-equal-to T(i). C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP GOLDMAN, MV (reprint author), UNIV COLORADO,DEPT ASTROPHYS PLANETARY & ATMOSPHER SCI,CAMPUS BOX 391,BOULDER,CO 80309, USA. NR 7 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4075 EP 4078 DI 10.1103/PhysRevLett.70.4075 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700012 ER PT J AU SURH, MP BARBEE, TW MAILHIOT, C AF SURH, MP BARBEE, TW MAILHIOT, C TI ZERO-POINT MOTION AND THE INSULATOR-METAL TRANSITION IN SOLID MOLECULAR-HYDROGEN SO PHYSICAL REVIEW LETTERS LA English DT Article ID MEGABAR PRESSURES; PHASE-TRANSITION; BAND OVERLAP; METALLIZATION; DEUTERIUM; GPA; REFLECTANCE AB Candidate structures for molecular hydrogen in the 150 GPa pressure range are examined using ab initio frozen-phonon calculations in the local density approximation. Vibronic zero-point motion yields important contributions to the relative energies of metallic versus insulating phases. A first-order insulator-metal transition is found, with features in qualitative accord with experiment. Our results imply that an observed transition in solid molecular hydrogen is an insulator-metal-molecular-orientation transition driven by the vibron zero-point motion itself. RP SURH, MP (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 27 TC 43 Z9 43 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4090 EP 4093 DI 10.1103/PhysRevLett.70.4090 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700016 ER PT J AU LEE, DH WANG, ZQ KIVELSON, S AF LEE, DH WANG, ZQ KIVELSON, S TI QUANTUM PERCOLATION AND PLATEAU TRANSITIONS IN THE QUANTUM HALL-EFFECT SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSULATOR-TRANSITION; LOCALIZATION; RESISTANCE AB We introduce a simple model of quantum percolation and analyze it numerically using transfer matrix methods. A central point of this paper is that both integer and fractional plateau transitions in the quantum Hall effect are due to quantum percolation. Within this model, we obtained the localization length exponent v=2.4+/-0.2, the dynamical exponent z=1, and the scaling functions for the conductivity tensor for both the integer and the fractional transitions. We show that our results agree extremely well with the experimental results for the integer plateau transition obtained by McEuen et al. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET T11,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP LEE, DH (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. NR 22 TC 151 Z9 152 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4130 EP 4133 DI 10.1103/PhysRevLett.70.4130 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700026 ER PT J AU TOBIN, JG WADDILL, GD LI, H TONG, SY AF TOBIN, JG WADDILL, GD LI, H TONG, SY TI IMAGING OF A SURFACE ALLOY WITH ENERGY-DEPENDENT PHOTOELECTRON HOLOGRAPHY SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRON-EMISSION HOLOGRAPHY; MULTIPLE-SCATTERING; DIFFRACTION; PHOTOEMISSION; AUGER; ASYMMETRY AB Fourier transformation of experimental energy-dependent photoelectron diffraction data has been used to produce an essentially artifact-free image of a surface alloy. This direct method, based upon the intersection off contour arcs associated with each measurement direction, can provide vectorial atomic positions with atomic resolution. A rapid data collection mode was introduced. Surface structural sensitivity was confirmed by comparison with multiple-scattering simulations. The previously ambiguous surface geometry of c(2x2)Au/Cu(001) has been determined, with clear, non-model-dependent discrimination of the surface alloy over the overlayer structure. C1 UNIV WISCONSIN,SURFACE STUDIES LAB,MILWAUKEE,WI 53201. UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201. RP TOBIN, JG (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 42 TC 54 Z9 54 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 28 PY 1993 VL 70 IS 26 BP 4150 EP 4153 DI 10.1103/PhysRevLett.70.4150 PG 4 WC Physics, Multidisciplinary SC Physics GA LJ827 UT WOS:A1993LJ82700031 ER PT J AU DAVIES, KTR GLASSER, ML DAVIES, RW AF DAVIES, KTR GLASSER, ML DAVIES, RW TI PERIODIC-ORBITS GENERATED FROM CONFORMAL-MAPPINGS SO PHYSICS LETTERS A LA English DT Article ID TRAJECTORIES AB The eigenvalues of the stability matrix are derived for an arbitrary periodic orbit, generated from the iterations of a conformal transformation. These eigenvalues then determine the stability properties of the orbit. For the mapping also to be conservative at all points, it is shown that it must be linear. C1 DUQUESNE UNIV,DEPT PHYS,PITTSBURGH,PA 15282. CLARKSON UNIV,DEPT PHYS,CORA & BAYARD CLARKSON CTR,POTSDAM,NY 13676. GTE LABS INC,WALTHAM,MA 02254. RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD JUN 28 PY 1993 VL 177 IS 6 BP 408 EP 410 DI 10.1016/0375-9601(93)90967-5 PG 3 WC Physics, Multidisciplinary SC Physics GA LK625 UT WOS:A1993LK62500005 ER PT J AU MANE, SR AF MANE, SR TI SYMPLECTIC INTEGRATORS FOR SPIN-ORBIT MOTION USING RUTH-YOSHIDA TECHNIQUES SO PHYSICS LETTERS A LA English DT Article ID LIE AB The theory of symplectic integrators for particle motion in accelerators is extended to include the particle spin. The Yoshida-Ruth method is used to derive second- and higher-order integrators. The connection with the Forest-Bengtsson-Reusch multimap integrators is established. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 10 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD JUN 28 PY 1993 VL 177 IS 6 BP 411 EP 414 DI 10.1016/0375-9601(93)90968-6 PG 4 WC Physics, Multidisciplinary SC Physics GA LK625 UT WOS:A1993LK62500006 ER PT J AU SMOOT, GF AF SMOOT, GF TI HOT PAPERS - ASTROPHYSICS - STRUCTURE IN THE COBE DIFFERENTIAL MICROWAVE RADIOMETER 1ST-YEAR MAPS BY SMOOT,G.F., BENNETT,C.L., KOGUT,A., ETAL SO SCIENTIST LA English DT Article RP SMOOT, GF (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD JUN 28 PY 1993 VL 7 IS 13 BP 16 EP 16 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA LJ263 UT WOS:A1993LJ26300015 ER PT J AU WERNER, U BLACK, B ZIEGEWEID, M PINES, A AF WERNER, U BLACK, B ZIEGEWEID, M PINES, A TI SQUID-NQR OF N-14 IN AMINO-ACIDS AND SMALL PEPTIDES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RESONANCE AB We present a technique for the study of nuclear quadrupole resonance of N-14 interacting with low electric field gradients as found, for example, in amino acids. A superconducting quantum interference device (SQUID) is used to detect directly small NMR signals via cross relaxation of the N-14 polarization to adjacent proton spins, eliminating the need for field cycling. When one nitrogen quadrupolar transition matches the proton Zeeman splitting, the remaining two quadrupolar transitions can be observed by sweeping a saturating rf field through resonance. In addition, signal enhancement by simultaneous excitation of two nitro n resonances helps to identify connected transitions. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP WERNER, U (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 13 TC 9 Z9 9 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 25 PY 1993 VL 209 IS 1-2 BP 17 EP 21 DI 10.1016/0009-2614(93)87194-8 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LH246 UT WOS:A1993LH24600003 ER PT J AU BONANG, CC CAMERON, SM GETTY, JD KELLY, PB AF BONANG, CC CAMERON, SM GETTY, JD KELLY, PB TI PRERESONANCE HYPER-RAMAN SCATTERING STUDIES OF ETHYLENE-GLYCOL SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SPECTROSCOPY; PYRIDINE; SILVER; LIGHT AB The first reported experimental example of clearly preresonant hyper-Raman scattering is presented. The preresonance hyper-Raman spectrum of liquid ethylene glycol is obtained with 426 nm excitation and compared with the corresponding preresonance Raman spectrum. The spectra are analyzed in terms of the conventional vibronic expansion, and it is shown that, by comparing peak heights in the Raman and hyper-Raman spectra, the relative magnitude of one- and two-photon dipole transition moments of contributing electronic states may be determined. Tentative symmetry assignments for contributing states are also discussed. The results demonstrate the applicability of preresonance hyper-Raman scattering when studying electronic transitions in the VUV. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RP BONANG, CC (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 24 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 25 PY 1993 VL 209 IS 1-2 BP 35 EP 41 DI 10.1016/0009-2614(93)87197-B PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LH246 UT WOS:A1993LH24600006 ER PT J AU SCHMIDT, L FRITZ, JS AF SCHMIDT, L FRITZ, JS TI ION-EXCHANGE PRECONCENTRATION AND GROUP SEPARATION OF IONIC AND NEUTRAL ORGANIC-COMPOUNDS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL ION CHROMATOGRAPHY SYMP ( IICS 92 ) CY SEP 21-24, 1992 CL JOHANNES KEPLER UNIV, LINZ, AUSTRIA SP DIONEX, MILLIPORE, WATER CHROMATOG DIV HO JOHANNES KEPLER UNIV ID SOLID-PHASE EXTRACTION; WATER AB In many cases sample pretreatment continues to be the most time-consuming and costly step in the analytical process. In the present work it is shown that macroporous ion-exchange resins of low exchange capacity can be used both to preconcentrate organic solutes from aqueous samples and to separate these solutes into groups. Thus, neutral and basic organic compounds are both taken up from aqueous solution by a very short column packed with a special cation-exchange resin. The neutral group of compounds is subsequently eluted with an organic solvent. The bases are then eluted by 2 M methylamine in methanol. In a similar manner organic acids are concentrated on a special anion-exchange column. Extensive data are shown to demonstrate the efficiency of the preconcentration and group separation of neutral and basic compounds. C1 US DOE,AMES LAB,AMES,IA 50011. RP SCHMIDT, L (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 7 TC 11 Z9 11 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 25 PY 1993 VL 640 IS 1-2 BP 145 EP 149 DI 10.1016/0021-9673(93)80176-9 PG 5 WC Chemistry, Analytical SC Chemistry GA LK563 UT WOS:A1993LK56300016 ER PT J AU TUCKER, HL SMITH, TK VANHOOK, SJ AF TUCKER, HL SMITH, TK VANHOOK, SJ TI DETERMINATION OF ANIONS IN AN EPOXY CURING AGENT BY ION CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL ION CHROMATOGRAPHY SYMP ( IICS 92 ) CY SEP 21-24, 1992 CL JOHANNES KEPLER UNIV, LINZ, AUSTRIA SP DIONEX, MILLIPORE, WATER CHROMATOG DIV HO JOHANNES KEPLER UNIV AB Within Martin Marietta's Analytical Services Organization (ASO), epoxy samples have traditionally been analyzed by high-performance ion chromatography (HPIC) using a bomb-prep method. Erratic sulfate results prompted an experimental 10% methanol preparation dissolution method to be used with subsequent analysis by HPIC. An HPIC method with isocratic separation and micro-membrane suppression is discussed in this paper. This method is specifically for the determination of sulfur as sulfate and fluoride in an epoxy curing agent. The new method will be used as a replacement for a current production laboratory bomb-prep HPIC method. Matrix interferences caused by Parr bomb (see Oxygen Combustion Bombs, Bulletin 1100, Parr Instrument, Moline, IL, USA) combustion products were eliminated using this method. A precision and bias study was done to document the effectiveness of the new method. RP TUCKER, HL (reprint author), MARTIN MARIETTA ENERGY SYST INC,ANALYT SERV ORG,OAK RIDGE Y-12 PLANT,OAK RIDGE,TN 37831, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 25 PY 1993 VL 640 IS 1-2 BP 355 EP 358 DI 10.1016/0021-9673(93)80202-J PG 4 WC Chemistry, Analytical SC Chemistry GA LK563 UT WOS:A1993LK56300042 ER PT J AU GARNER, TW YEUNG, ES AF GARNER, TW YEUNG, ES TI INCREASED SELECTIVITY FOR ELECTROCHROMATOGRAPHY BY DYNAMIC ION-EXCHANGE SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL ION CHROMATOGRAPHY SYMP ( IICS 92 ) CY SEP 21-24, 1992 CL JOHANNES KEPLER UNIV, LINZ, AUSTRIA SP DIONEX, MILLIPORE, WATER CHROMATOG DIV HO JOHANNES KEPLER UNIV ID CAPILLARY ZONE ELECTROPHORESIS; HIGH-PERFORMANCE LIQUID; ELECTROOSMOTIC FLOW; CHROMATOGRAPHY; SEPARATION; FLUORESCENCE; RETENTION; ANIONS; MOBILITIES; ADSORBENT AB The separation of compounds with similar mobilities is expected to be difficult with capillary zone electrophoresis. Increased selectivity is shown for compounds of this type when other modes of separation are added to the system. A capillary coated with a hydrophobic stationary phase is shown to be a dynamic ion exchanger when a quaternary ammonium compound is added to the running buffer. Compounds are shown to have a decrease in retention when the concentration of the buffer ion is increased. The effect of adding an organic modifier and the influence of the concentration of the surface active reagent are also studied. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 21 TC 33 Z9 33 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 25 PY 1993 VL 640 IS 1-2 BP 397 EP 402 DI 10.1016/0021-9673(93)80208-P PG 6 WC Chemistry, Analytical SC Chemistry GA LK563 UT WOS:A1993LK56300048 ER PT J AU SHI, YC FRITZ, JS AF SHI, YC FRITZ, JS TI SEPARATION OF METAL-IONS BY CAPILLARY ELECTROPHORESIS WITH A COMPLEXING ELECTROLYTE SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL ION CHROMATOGRAPHY SYMP ( IICS 92 ) CY SEP 21-24, 1992 CL JOHANNES KEPLER UNIV, LINZ, AUSTRIA SP DIONEX, MILLIPORE, WATER CHROMATOG DIV HO JOHANNES KEPLER UNIV ID ZONE ELECTROPHORESIS AB Excellent separations of metal ions can be obtained very quickly by capillary electrophoresis provided a weak complexing reagent is incorporated into the electrolyte to alter the effective mobilities of the sample ions. Indirect photometric detection is possible by also adding a UV-sensitive ion to the electrolyte. Separations are described using phthalate, tartrate, lactate or hydroxyisobutyrate as the complexing reagent. A separation of twenty-seven metal ions was achieved in only 6 min using a lactate system. A mechanism for the separation of lanthanides is proposed for the hydroxyisobutyrate system. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 12 TC 111 Z9 117 U1 3 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 25 PY 1993 VL 640 IS 1-2 BP 473 EP 479 DI 10.1016/0021-9673(93)80217-V PG 7 WC Chemistry, Analytical SC Chemistry GA LK563 UT WOS:A1993LK56300057 ER PT J AU FICKETT, JW GUIGO, R AF FICKETT, JW GUIGO, R TI ESTIMATION OF PROTEIN-CODING DENSITY IN A CORPUS OF DNA-SEQUENCE DATA SO NUCLEIC ACIDS RESEARCH LA English DT Article ID CAENORHABDITIS-ELEGANS; MAXIMUM-LIKELIHOOD; EM ALGORITHM; MUTATIONS AB A number of experimental methods have been reported for estimating the number of genes in a genome, or the closely related coding density of a genome, defined as the fraction of base pairs in codons. Recently, DNA sequence data representative of the genome as a whole have become available for several organisms, making the problem of estimating coding density amenable to sequence analytic methods. Estimates of coding density for a single genome vary widely, so that methods with characterized error bounds have become increasingly desirable. We present a method to estimate the protein coding density in a corpus of DNA sequence data, in which a 'coding statistic' is calculated for a large number of windows of the sequence under study, and the distribution of the statistic is decomposed into two normal distributions, assumed to be the distributions of the coding statistic in the coding and noncoding fractions of the sequence windows. The accuracy of the method is evaluated using known data and application is made to the yeast chromosome III sequence and to C.elegans cosmid sequences. It can also be applied to fragmentary data, for example a collection of short sequences determined in the course of STS mapping. C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP FICKETT, JW (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545, USA. RI Guigo, Roderic/D-1303-2010 OI Guigo, Roderic/0000-0002-5738-4477 NR 20 TC 6 Z9 6 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUN 25 PY 1993 VL 21 IS 12 BP 2837 EP 2844 DI 10.1093/nar/21.12.2837 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LL721 UT WOS:A1993LL72100008 PM 8332493 ER PT J AU XANTHEAS, SS DUNNING, TH AF XANTHEAS, SS DUNNING, TH TI THEORETICAL-STUDIES OF SULFUROUS SPECIES OF IMPORTANCE IN ATMOSPHERIC CHEMISTRY .1. CHARACTERIZATION OF THE HSO AND SOH ISOMERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; POTENTIAL-ENERGY SURFACES; GAS-PHASE REACTION; HYDROGEN-SULFIDE; RATE CONSTANTS; TEMPERATURE-DEPENDENCE; WAVE-FUNCTIONS; OH RADICALS; BASIS-SETS; NO2 AB The molecular structures, relative energies, and vibrational frequencies of the two stable isomers formed by the addition of (H(S))-S-2 to SO(X3SIGMA-), namely, HSO and SOH, are computed using multiconfiguration wave functions and correlation-consistent basis sets of up to quintuple zeta quality. Contrary to results from previous calculations, the HSO isomer is predicted to be more stable than the SOH isomer by 5.4 kcal/mol. The barrier for the migration of the H atom between the two isomers is computed to be 46.3 kcal/mol. The transition state for the isomerization of the two species lies below the dissociation limit to H(S-2) and SO(X3SIGMA-), which is calculated to be 56.2 kcal/mol above the HSO minimum. The minimum energy paths corresponding to the addition of H(S-2) to SO(X3SIGMA-) to form HSO and SOH are also computed; a barrier of 2.4 kcal/mol is predicted for the addition of hydrogen to the oxygen side of SO. Finally, upper limits for DELTAH(f)-degrees-298 for HSO and SOH are estimated at -6.1 +/- 1.3 and -0.7 +/- 1.3 kcal/mol, respectively. The latter implies that HSO can be involved in a catalytic cycle that depletes ozone in the atmosphere. RP XANTHEAS, SS (reprint author), PACIFIC NW LAB, THEORY MODELING & SIMULAT MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 53 TC 78 Z9 78 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 24 PY 1993 VL 97 IS 25 BP 6616 EP 6627 DI 10.1021/j100127a010 PG 12 WC Chemistry, Physical SC Chemistry GA LV439 UT WOS:A1993LV43900010 ER PT J AU COOK, SJ CHAKRABORTY, AK BELL, AT THEODOROU, DN AF COOK, SJ CHAKRABORTY, AK BELL, AT THEODOROU, DN TI STRUCTURAL AND ELECTRONIC FEATURES OF A BRONSTED ACID SITE IN H-ZSM-5 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ABSOLUTE ELECTRONEGATIVITY; ZEOLITIC CATALYSTS; ABINITIO; ALUMINUM; HARDNESS; ZSM-5; APPROXIMATIONS; SUBSTITUTION; GEOMETRIES; PROTON AB We report the results of local density functional theory calculations on a Bronsted acid site of the zeolite H-ZSM-5. We have investigated the structural and electronic properties of the site. Comparison is made between our results and existing experimental data. It is shown that structural relaxation around an acid site must be performed to obtain accurate energetics for substitution of aluminum into the zeolite framework. The effects of cluster termination are studied by comparing results obtained for both isolated clusters and clusters embedded in a Madelung field generated by the zeolite framework. The properties of the electron density distribution in the region around an acidic proton indicate that the acidic moiety may be characterized as a rather soft acid. C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. OI Theodorou, Doros/0000-0002-4763-9739; Bell, Alexis/0000-0002-5738-4645 NR 47 TC 54 Z9 54 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 24 PY 1993 VL 97 IS 25 BP 6679 EP 6685 DI 10.1021/j100127a018 PG 7 WC Chemistry, Physical SC Chemistry GA LV439 UT WOS:A1993LV43900018 ER PT J AU PORTER, JD ROBINSON, TO AF PORTER, JD ROBINSON, TO TI SURFACE-DIFFUSION OF SILVER AT THE AG(111)/LIQUID-WATER INTERFACE FROM ELECTROCRYSTALLIZATION MEASUREMENTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ADSORBATE ADSORBATE INTERACTIONS; SINGLE-CRYSTAL SURFACES; SCANNING TUNNELING MICROSCOPY; NEAREST-NEIGHBOR INTERACTIONS; TWO-DIMENSIONAL NUCLEATION; INDUCED THERMAL-DESORPTION; SELF-DIFFUSION; MONTE-CARLO; ELECTRO-CRYSTALLIZATION; STATISTICAL-ANALYSIS AB We observed rhythmic Ag cluster nucleation that was coupled to surface mass transport, and we used this phenomenon to measure D(s) for silver adatoms. Low coverages (theta almost-equal-to 0.002) of Ag(ad) were generated on a surface that was initially adatom-free by reduction of Ag+(aq) at sparse, redox-active sites. The adatoms diffused from the generation sites across step-free Ag(111) surfaces of known geometry. Diffusing adatoms were trapped at redox-silent sites that were potent catalysts for the nucleation of 2D clusters. The first supercritical cluster to form at a nucleation site swept rapidly over the Ag(111) surface by catalytic reduction of Ag+(aq) at the reactive step edge. The expansion of the monatomic step from the nucleation site yielded a brief charge pulse, a fresh, adatom-free surface, and renewal of the cycle. Regular trains of charge pulses were observed in steady-state experiments. Analysis yielded the locations of the nucleation sites and the following values of D(s): (1.4 +/- 0.2) X 10(-6) cm2/s at 20.0-degrees-C, (3.3 +/- 1.0) X 10(-6) CM2/S at 35.0-degrees-C, and (4.0 +/- 0.9) X 10(-6) cm2/s at 50.0-degrees-C (+/-2sigma). These are the same as values predicted by molecular dynamics simulation for Ag(ad) diffusion on Ag(111) in ultrahigh,vacuum, implying that there is little net effect of the interfacial water on Ag(ad) diffusion rates. The mean residence time for Ag(ad) species at the Ag(111)/water interface is >4 s at these temperatures, corresponding to a standard exchange rate I-degrees < 40 nA/cm2 between Ag(ad) and Ag+(aq). In extreme contrast, we measure I-degrees almost-equal-to 1300 A/cm2, more than 10 orders of magnitude larger, for the same exchange reaction at the edge of an atomic step on Ag(111). C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP PORTER, JD (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. NR 99 TC 29 Z9 29 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 24 PY 1993 VL 97 IS 25 BP 6696 EP 6709 DI 10.1021/j100127a021 PG 14 WC Chemistry, Physical SC Chemistry GA LV439 UT WOS:A1993LV43900021 ER PT J AU JAHNS, A SPIELES, C MATTIELLO, R STOCKER, H GREINER, W SORGE, H AF JAHNS, A SPIELES, C MATTIELLO, R STOCKER, H GREINER, W SORGE, H TI IS ANTIBARYON ANNIHILATION PRESENT IN PA AND AA COLLISIONS AT 15-A-GEV SO PHYSICS LETTERS B LA English DT Article ID RELATIVISTIC NUCLEAR COLLISIONS; HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; LUND MONTE-CARLO; FRAGMENTATION; SIGNATURE; DYNAMICS AB Antiproton production and the strength of annihilation in baryonic matter is studied in proton and light ion induced collisions at 15 A GeV on different targets using the microscopic multiple-collision approach RQMD. We predict that annihilation wins over multi-step contributions to the final antiproton yields only in central p collisions on very heavy targets like gold. Central A + A collisions, respectively minimum bias p + A calculations show similar yields as expected from first collisions only, i.e. nearly the same amount of multi-step production and subsequent absorption. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP JAHNS, A (reprint author), UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 27 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 24 PY 1993 VL 308 IS 1-2 BP 11 EP 16 DI 10.1016/0370-2693(93)90594-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK313 UT WOS:A1993LK31300003 ER PT J AU BERGSHOEFF, E BOONSTRA, HJ DEROO, M PANDA, S SEVRIN, A AF BERGSHOEFF, E BOONSTRA, HJ DEROO, M PANDA, S SEVRIN, A TI ON THE BRST OPERATOR OF W-STRINGS SO PHYSICS LETTERS B LA English DT Article ID 2D GRAVITY; GAUGE; QUANTIZATION; ALGEBRAS; RULES AB We discuss the conditions under which the BRST operator of a W-string can be written as the sum of two operators that are separately nilpotent and anticommute with each other. We illustrate our results with the example of the non-critical W3-string. Furthermore, we apply our results to make a conjecture about a relationship between the spectrum of a non-critical W(n)-string and a W(n-1)-string. C1 LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP BERGSHOEFF, E (reprint author), INST THEORET PHYS,NIJENBORGH 4,9747 AG GRONINGEN,NETHERLANDS. RI Sevrin, Alexander/D-5794-2017 OI Sevrin, Alexander/0000-0001-6564-9941 NR 37 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 24 PY 1993 VL 308 IS 1-2 BP 34 EP 41 DI 10.1016/0370-2693(93)90598-C PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK313 UT WOS:A1993LK31300007 ER PT J AU ASTON, D BIENZ, T BIRD, F DUNWOODIE, W JOHNSON, W KUNZ, P KWON, Y LEITH, DWGS LEVINSON, L RATCLIFF, B RENSING, P SCHULTZ, D SHAPIRO, S SINERVO, P TARNOPOLSKY, G TOGE, N WAITE, A WILLIAMS, S AWAJI, N FUJII, K HAYASHII, H IWATA, S KAJIKAWA, R MATSUI, T MIYAMOTO, A OZAKI, H PAK, C SHIMOMURA, T SUGIYAMA, A SUZUKI, S TAUCHI, T DAMORE, J ENDORF, R MARTINEZ, J MEADOWS, B NUSSBAUM, M UKAI, K AF ASTON, D BIENZ, T BIRD, F DUNWOODIE, W JOHNSON, W KUNZ, P KWON, Y LEITH, DWGS LEVINSON, L RATCLIFF, B RENSING, P SCHULTZ, D SHAPIRO, S SINERVO, P TARNOPOLSKY, G TOGE, N WAITE, A WILLIAMS, S AWAJI, N FUJII, K HAYASHII, H IWATA, S KAJIKAWA, R MATSUI, T MIYAMOTO, A OZAKI, H PAK, C SHIMOMURA, T SUGIYAMA, A SUZUKI, S TAUCHI, T DAMORE, J ENDORF, R MARTINEZ, J MEADOWS, B NUSSBAUM, M UKAI, K TI EVIDENCE FOR 2 J(P)=2- STRANGE MESON STATES IN THE K2 (1770) REGION SO PHYSICS LETTERS B LA English DT Article AB Evidence is presented for two J(P) = 2- strange mesons; one at - 1.77 GeV/C2 and the other at approximately 1.82 GeV/c2. These states have been observed in a partial wave analysis of the Komega system in the reaction K-p-->K-pi+pi-pi0p where the strange mesons decay into K-omega and the omega then decays to pi+pi-pi0. The data set contains approximately 10(5) Komegap events at 11 GeV/c taken by the LASS spectrometer at SLAC. C1 NAGOYA UNIV,DEPT PHYS,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. RP ASTON, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 12 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 24 PY 1993 VL 308 IS 1-2 BP 186 EP 192 DI 10.1016/0370-2693(93)90620-W PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK313 UT WOS:A1993LK31300029 ER PT J AU FRABETTI, PL GRIM, GP PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S SPALLONE, A ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R JAROSS, G LINGEL, K WISS, J CHEON, BG KANG, JS KIM, KY ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M DAVENPORT, F FILASETTA, JF BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD KENNEDY, CJ KIM, GN LIN, TF MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ZANABRIA, ME ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A WILSON, JR BLACKETT, GR PISHARODY, M HANDLER, T SHELDON, PD AF FRABETTI, PL GRIM, GP PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S SPALLONE, A ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R JAROSS, G LINGEL, K WISS, J CHEON, BG KANG, JS KIM, KY ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M DAVENPORT, F FILASETTA, JF BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD KENNEDY, CJ KIM, GN LIN, TF MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ZANABRIA, ME ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A WILSON, JR BLACKETT, GR PISHARODY, M HANDLER, T SHELDON, PD TI STUDIES OF D(D)OVER-BAR CORRELATIONS IN HIGH-ENERGY PHOTOPRODUCTION SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS; VERSION AB Analysis of data from the Fermilab high energy photoproduction experiment E687 for events containing fully and partially reconstructed pairs of charmed mesons is presented. Correlations from DDBAR pairs are used to study production dynamics. C1 INFN,I-40126 BOLOGNA,ITALY. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. KOREA UNIV,SEOUL 136701,SOUTH KOREA. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. UNIV N CAROLINA,ASHEVILLE,NC 28804. NO KENTUCKY UNIV,HIGHLAND HTS,KY 41076. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS NUCL,I-27100 PAVIA,ITALY. INFN,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. UNIV S CAROLINA,COLUMBIA,SC 29208. UNIV TENNESSEE,KNOXVILLE,TN 37996. VANDERBILT UNIV,NASHVILLE,TN 37235. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. RI Menasce, Dario Livio/A-2168-2016 OI bianco, stefano/0000-0002-8300-4124; Menasce, Dario Livio/0000-0002-9918-1686 NR 6 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 24 PY 1993 VL 308 IS 1-2 BP 193 EP 199 DI 10.1016/0370-2693(93)90621-N PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LK313 UT WOS:A1993LK31300030 ER PT J AU DEBOER, RJ PERELSON, AS AF DEBOER, RJ PERELSON, AS TI HOW DIVERSE SHOULD THE IMMUNE-SYSTEM BE SO PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES LA English DT Article ID MAJOR HISTOCOMPATIBILITY COMPLEX; T-CELLS; ANTIBODY REPERTOIRE; SELF-TOLERANCE; B-CELL; ELIMINATION; ANTIGENS; PRODUCTS; MICE AB We develop a probability-based model that suggests a novel explanation for the enormous diversity of the lymphocyte repertoire in the immune system. Taking into account the fraction of the repertoire that is expected to be rendered tolerant because of potential self reactivity, we calculate P(E), the probability that a pathogen escapes recognition by the immune system. Obviously, for P(E) to be low the diversity should be large. Our novel result is that the major factor in this relation between diversity and P(E) is formed by the number of self antigens. Thus our model suggests that, rather than the number of foreign antigens the system is protecting against, the diversity reflects the number of self antigens the immune system needs to avoid reactivity with. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP DEBOER, RJ (reprint author), UNIV UTRECHT, PADUALAAN 8, 3584 CH UTRECHT, NETHERLANDS. RI De Boer, Rob/B-6050-2011 OI De Boer, Rob/0000-0002-2130-691X FU NCRR NIH HHS [RR06555]; NIAID NIH HHS [AI28433] NR 29 TC 75 Z9 77 U1 0 U2 3 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8452 J9 P ROY SOC B-BIOL SCI JI Proc. R. Soc. B-Biol. Sci. PD JUN 22 PY 1993 VL 252 IS 1335 BP 171 EP 175 PG 5 WC Biology; Ecology; Evolutionary Biology SC Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology; Evolutionary Biology GA LJ587 UT WOS:A1993LJ58700001 PM 8394577 ER PT J AU WARREN, WL FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR WINOKUR, PS DEVINE, RAB AF WARREN, WL FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR WINOKUR, PS DEVINE, RAB TI EXCESS-SI RELATED DEFECT CENTERS IN BURIED SIO2 THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID TRIPLET-STATE AB Using electron paramagnetic resonance (EPR) and capacitance-voltage measurements we have investigated the role of excess-silicon related defect centers as charge traps in separation by the implantation of oxygen materials. Three types of EPR-active centers were investigated: oxygen vacancy Egamma' centers (O3=Si. +Si=O3), delocalized Edelta' centers, and D centers (Si3=Si.). It was found that all of these paramagnetic centers are created by selective hole injection, and are reasonably ascribed as positively charged when paramagnetic. These results provide the first experimental evidence for (1) the charge state of the Edelta' center, and (2) that the D center is an electrically active point defect in these materials. C1 CTR NATL ETUD TELECOMMUN,F-38243 MEYLAN,FRANCE. RP WARREN, WL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 18 TC 39 Z9 39 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 21 PY 1993 VL 62 IS 25 BP 3330 EP 3332 DI 10.1063/1.109061 PG 3 WC Physics, Applied SC Physics GA LH607 UT WOS:A1993LH60700037 ER PT J AU JELLISON, GE CHISHOLM, MF GORBATKIN, SM AF JELLISON, GE CHISHOLM, MF GORBATKIN, SM TI OPTICAL FUNCTIONS OF CHEMICAL-VAPOR-DEPOSITED THIN-FILM SILICON DETERMINED BY SPECTROSCOPIC ELLIPSOMETRY SO APPLIED PHYSICS LETTERS LA English DT Article ID AMORPHOUS-SILICON; SURFACE AB The optical functions of several forms of thin-film silicon (amorphous Si, fine-grain polycrystalline Si, and large-grain polycrystalline Si) grown on oxidized Si have been determined using 2-channel spectroscopic polarization modulation ellipsometry from 240 to 840 nm (approximately 1.5-5.2 eV). It is shown that the standard technique for simulating the optical functions of polycrystalline silicon (an effective medium consisting of crystalline Si, amorphous Si, and voids) does not fit the ellipsometry data. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV VET SURG,OAK RIDGE,TN 37831, USA. NR 18 TC 211 Z9 212 U1 3 U2 24 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 21 PY 1993 VL 62 IS 25 BP 3348 EP 3350 DI 10.1063/1.109067 PG 3 WC Physics, Applied SC Physics GA LH607 UT WOS:A1993LH60700043 ER PT J AU ZHU, S LOWNDES, DH CHAKOUMAKOS, BC PENNYCOOK, SJ ZHENG, XY WARMACK, RJ AF ZHU, S LOWNDES, DH CHAKOUMAKOS, BC PENNYCOOK, SJ ZHENG, XY WARMACK, RJ TI GROWTH MECHANISMS AND SUPERCONDUCTIVITY OF ULTRATHIN Y1BA2CU3O7-X EPITAXIAL-FILMS ON (001) MGO SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; THIN-FILMS; YBA2CU3O7-DELTA; MICROSTRUCTURE AB Ultrathin YBa2Cu3O7-x films grown on (001) MgO substrates by pulsed-laser ablation exhibit a transition from terraced-island growth to spiral growth at approximately 4-5 unit cell thickness in films grown at 720-degrees-C. The transition appears at greater thickness in films grown at higher growth temperatures. Observations of the morphology of ultrathin films indicate that the film-substrate interfacial interaction plays an important role when films are only several unit-cells thick. Plastic deformation and oxygen disorder both may affect the epitaxial quality and superconducting properties. However, superconducting properties can be improved by achieving a relatively strain-free state. Our observations of the growth transition and resistivity measurements show that this state occurs in the thicker grains of nominally 3.5 nm films grown at 800-degrees-C and in nominally 7 nm films grown at both 720 and 800-degrees-C. These results also imply that a strain-relieving buffer layer will improve the superconductive properties of ultrathin YBa2Cu3O7-x films grown on misfit substrates. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. RP ZHU, S (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 13 TC 21 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 21 PY 1993 VL 62 IS 25 BP 3363 EP 3365 DI 10.1063/1.109072 PG 3 WC Physics, Applied SC Physics GA LH607 UT WOS:A1993LH60700048 ER PT J AU BARTELT, MC EVANS, JW AF BARTELT, MC EVANS, JW TI INITIAL EVOLUTION OF KASHCHIEV MODELS OF THIN-FILM GROWTH SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID EPITAXIAL-GROWTH; SURFACE-GROWTH; CRYSTAL-GROWTH; NUCLEATION; INTERFACES; KINETICS; DRIVEN AB We consider a continuum model of thin-film growth on an infinite perfect substrate. Multilayers grow by random nucleation of islands, at fixed rate, followed by lateral expansion at constant speed- Our focus is on the evolution of the film profile in the regime of small thicknesses. We present results for the layer coverages, the interface width, and the Bragg intensity oscillations, obtained by numerical integration of the original Kashcbiev recursion relations. Asymptotically, the model shows Kardar-Parisi-Zhang universality scaling. Expressions for spatial correlation functions are also developed. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT MATH, AMES, IA 50011 USA. RP IOWA STATE UNIV SCI & TECHNOL, IPRT, AMES, IA 50011 USA. NR 44 TC 9 Z9 9 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD JUN 21 PY 1993 VL 26 IS 12 BP 2743 EP 2754 DI 10.1088/0305-4470/26/12/015 PG 12 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA LN950 UT WOS:A1993LN95000015 ER PT J AU CORBIN, DR ABRAMS, L JONES, GA SMITH, ML DYBOWSKI, CR HRILJAC, JA PARISE, JB AF CORBIN, DR ABRAMS, L JONES, GA SMITH, ML DYBOWSKI, CR HRILJAC, JA PARISE, JB TI ENTRAPMENT AND CONTROLLED-RELEASE OF XENON IN CD2+-EXCHANGED ZEOLITE RHO SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID SMALL-PORE ZEOLITES; POWDER STRUCTURAL CHARACTERIZATION; SELECTIVE SYNTHESIS; H-RHO; DIMETHYLAMINE; FLEXIBILITY; FRAMEWORK AB Thermal relocation of Cd2+ ions and framework flexibility are used to effect the entrapment and controlled release of xenon from the pores of Cd2+-exchanged zeolite rho. C1 UNIV DELAWARE,DEPT CHEM & BIOCHEM,NEWARK,DE 19701. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. SUNY,DEPT EARTH & SPACE SCI,STONY BROOK,NY 11794. RP CORBIN, DR (reprint author), DUPONT CO INC,CENT RES & DEV,EXPTL STN,POB 80262,WILMINGTON,DE 19880, USA. NR 12 TC 20 Z9 20 U1 0 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD JUN 21 PY 1993 IS 12 BP 1027 EP 1029 DI 10.1039/c39930001027 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA LJ606 UT WOS:A1993LJ60600028 ER PT J AU SIMONS, JK CHEN, JM TAYLOR, JW ROSENBERG, RA AF SIMONS, JK CHEN, JM TAYLOR, JW ROSENBERG, RA TI FLUORESCENCE STUDIES OF THE VACUUM-ULTRAVIOLET, SYNCHROTRON-RADIATION-INDUCED PHOTOCHEMISTRY OF POLYSTYRENE SO MACROMOLECULES LA English DT Article AB The synchrotron radiation (SR) induced, vacuum ultraviolet (vacuum UV) photodegradation of polystyrene was studied by fluorescence spectroscopy. Two broad, structureless transitions were observed in the dispersed fluorescence spectrum of polystyrene when wavelengths shorter than 2200 angstrom were used to excite the polymer films: the first was centered at 3200 angstrom, and the second was centered at 5300 angstrom. The fluorescence excitation spectrum of each emission band has been recorded from 450 to 3000 angstrom and is compared to the optical absorption spectrum of polystyrene from 1050 to 3000 angstrom. The 3200-angstrom band is due to an excimer to ground state transition. The 5300-angstrom band is due to fluorescence from a conjugated backbone structure which forms when the polystyrene films are exposed to vacuum UV radiation. Changes were observed in both the fluorescence and fluorescence excitation spectra following exposure to 1200-angstrom or broad-band SR. Based on the data, a qualitative model is used to account for the degradation and energy transfer within the polystyrene films. C1 ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439. UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. UNIV WISCONSIN,DEPT CHEM,STOUGHTON,WI 53589. UNIV WISCONSIN,DEPT CHEM,MADISON,WI 53706. RI Rosenberg, Richard/K-3442-2012 NR 19 TC 13 Z9 13 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 21 PY 1993 VL 26 IS 13 BP 3262 EP 3266 DI 10.1021/ma00065a003 PG 5 WC Polymer Science SC Polymer Science GA LJ088 UT WOS:A1993LJ08800003 ER PT J AU SCHIAVILLA, R WIRINGA, RB CARLSON, J AF SCHIAVILLA, R WIRINGA, RB CARLSON, J TI COULOMB SUM AND PROTON-PROTON CORRELATIONS IN FEW-BODY NUCLEI SO PHYSICAL REVIEW LETTERS LA English DT Article ID LONGITUDINAL RESPONSE FUNCTIONS; ELASTIC ELECTRON-SCATTERING; FORM-FACTORS; 4 NUCLEI; HE-3; RULE; DENSITY; ENERGY; H-3 AB For simple models of the nuclear charge operator, measurements of the Coulomb sum and the charge form factor of a nucleus directly determine the proton-proton correlations. We examine experimental results obtained for few-body nuclei at Bates and Saclay using models of the charge operator that include both one- and two-body terms. Previous analyses using one-body terms only have failed to reproduce the experimental results. However, we find that the same operators which have been used to successfully describe the charge form factors also produce substantial agreement with measurements of the Coulomb sum. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SCHIAVILLA, R (reprint author), IST NAZL FIS NUCL LECCE,I-73100 LECCE,ITALY. RI Wiringa, Robert/M-4970-2015 NR 24 TC 32 Z9 32 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 21 PY 1993 VL 70 IS 25 BP 3856 EP 3859 DI 10.1103/PhysRevLett.70.3856 PG 4 WC Physics, Multidisciplinary SC Physics GA LH554 UT WOS:A1993LH55400005 ER PT J AU YOO, CS HOLMES, NC ROSS, M WEBB, DJ PIKE, C AF YOO, CS HOLMES, NC ROSS, M WEBB, DJ PIKE, C TI SHOCK TEMPERATURES AND MELTING OF IRON AT EARTH CORE CONDITIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSITIONS; HIGH-PRESSURE; DIAMOND AB The temperature of shock compressed iron has been measured to 340 GPa, using well characterized iron films sputtered on transparent diamond substrates and a 1 ns time-resolved optical method. We find a knee on the (P,T) iron Hugoniot indicating melting at 6350 K and 235 GPa and at 6720 K and 300 GPa. An extrapolation yields an iron melting temperature of 6830 (+/- 500) K at 330 GPa, the pressure of the Earth inner-outer core boundary. Implication of the melting data for the iron phase diagram is also discussed. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP YOO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 31 TC 220 Z9 233 U1 2 U2 24 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 21 PY 1993 VL 70 IS 25 BP 3931 EP 3934 DI 10.1103/PhysRevLett.70.3931 PG 4 WC Physics, Multidisciplinary SC Physics GA LH554 UT WOS:A1993LH55400024 ER PT J AU PAINTER, GS AF PAINTER, GS TI LOCAL BONDING TRENDS IN TRANSITION-METAL COHESION SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; CLUSTERS; MICROCLUSTERS; ATOMS AB Binding energies calculated in the local density approximation for small transition metal clusters establish a trend with atomic number which accurately represents the trend in cohesive energies for their crystalline counterparts. This correlation in trends means that small clusters differ from each other, as far as binding energies are concerned, in the same way the corresponding crystalline solids differ. Local near-neighbor bonding determines the variations in cohesive properties that distinguish one metal from another. RP PAINTER, GS (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 26 TC 14 Z9 14 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 21 PY 1993 VL 70 IS 25 BP 3959 EP 3962 DI 10.1103/PhysRevLett.70.3959 PG 4 WC Physics, Multidisciplinary SC Physics GA LH554 UT WOS:A1993LH55400031 ER PT J AU GRONBECHJENSEN, N LOMDAHL, PS AF GRONBECHJENSEN, N LOMDAHL, PS TI SYNCHRONIZATION OF FLUXON MOTION ON SHAPIRO STEPS IN JOSEPHSON-JUNCTIONS SO PHYSICS LETTERS A LA English DT Article ID PHASE-LOCKING AB We demonstrate that shuttling fluxons can exist on Shapiro steps in open ended long Josephson junctions driven by a large amplitude, high frequency, electric field if the junction is described by the overlap geometry. If a small amplitude, low frequency, magnetic field is applied to the system we further demonstrate that the frequency of the shuttling fluxon may phase-lock to a subharmonic of the frequency of the magnetic field. Analytical expressions for the range of phase-locking in bias current are evaluated and excellent agreement is found when these are compared to the results of direct numerical simulations of the perturbed sine-Gordon equation, modeling the junction. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD JUN 21 PY 1993 VL 177 IS 4-5 BP 351 EP 356 DI 10.1016/0375-9601(93)90014-Q PG 6 WC Physics, Multidisciplinary SC Physics GA LK135 UT WOS:A1993LK13500014 ER PT J AU BROOKSHAW, L TAVANI, M AF BROOKSHAW, L TAVANI, M TI WIND-DRIVEN ANGULAR-MOMENTUM LOSS IN BINARY-SYSTEMS .1. BALLISTIC CASE SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; BINARIES, CLOSE; STARS, MASS LOSS ID X-RAY BINARIES; ECLIPSING MILLISECOND PULSAR; ORBITAL PERIOD; EVOLUTION; EPHEMERIS; RADIATION AB We study numerically the average loss of specific angular momentum from binary systems due to mass outflow from one of the two stars for a variety of initial injection geometries and wind velocities. We present results of ballistic calculations in three dimensions for initial mass ratios q of the mass-losing star to primary star in the range 10(-5) less-than-or-equal-to q less-than-or-equal-to 10. We consider injection surfaces close to the Roche lobe equipotential surface of the mass-losing star, and also cases with the mass-losing star underfilling its Roche lobe. We obtain that the orbital period is expected to have a negative time derivative for wind-driven secular evolution of binaries with q greater than or similar to 3 and with the mass-losing star near filling its Roche lobe. We also study the effect of the presence of an absorbing surface approximating an accretion disk on the average final value of the specific angular momentum loss. We find that the effect of an accretion disk is to increase the wind-driven angular momentum loss. Our results are relevant for evolutionary models of high-mass binaries (such as Cen X-3, LMC X-4, etc), and low mass X-ra binaries. C1 PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP BROOKSHAW, L (reprint author), LLNL,IGPP L-413,INST GEOPHYS & PLANETARY PHYS,POB 808,LIVERMORE,CA 94720, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 38 TC 22 Z9 22 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP 719 EP 731 DI 10.1086/172789 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG695 UT WOS:A1993LG69500029 ER PT J AU VITELLO, P SHLOSMAN, I AF VITELLO, P SHLOSMAN, I TI ULTRAVIOLET LINE DIAGNOSTICS OF ACCRETION DISK WINDS IN CATACLYSMIC VARIABLES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; LINE, PROFILES; NOVAE, CATACLYSMIC VARIABLES; ULTRAVIOLET, STARS ID X-RAY-EMISSION; HIGH-VELOCITY WINDS; UX URSAE MAJORIS; DWARF NOVA; IUE OBSERVATIONS; LOW-RESOLUTION; RW TRIANGULI; OUTBURST; BINARIES; SPECTRA AB The IUE data base is used to analyze the UV line shapes of the cataclysmic variables RW Sex, RW Tri, and V Sge. Observed lines are compared to synthetic line profiles computed using a model of rotating biconical winds from accretion disks. The wind model calculates the wind ionization structure self-consistently including photoionization from the disk and boundary layer and treats three-dimensional line radiation transfer in the Sobolev approximation. It is found that winds from accretion disks provide a good fit for reasonable parameters to the observed UV lines which include the P Cygni profiles for low-inclination systems and pure emission at large inclination. Disk winds are preferable to spherical winds which originate on the white dwarf because they (1) require a much lower ratio of mass-loss rate to accretion rate and are therefore more plausible energetically, (2) provide a natural source for a bi-conical distribution of mass outflow which produces strong scattering far above the disk leading to P Cygni profiles for low-inclination systems and pure line emission profiles at high inclination with the absence of eclipses in UV lines, and (3) produce rotation-broadened pure emission lines at high inclination. C1 UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506. RP VITELLO, P (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 62 TC 42 Z9 42 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP 815 EP 828 DI 10.1086/172799 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG695 UT WOS:A1993LG69500039 ER PT J AU DEICH, WTS MIDDLEDITCH, J ANDERSON, SB KULKARNI, SR PRINCE, TA WOLSZCZAN, A AF DEICH, WTS MIDDLEDITCH, J ANDERSON, SB KULKARNI, SR PRINCE, TA WOLSZCZAN, A TI THE BINARY PULSAR PSR-1908+00 IN NGC-6760 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, GENERAL; PULSARS, INDIVIDUAL (PSR-1908+00); STARS, NEUTRON ID ECLIPSING MILLISECOND PULSAR; X-RAY BINARIES; EVOLUTION; DISCOVERY; TERZAN-5; SYSTEMS; MODEL AB We present orbital parameters of the 3.6 ms binary pulsar 1908 + 00 in the globular cluster NGC 6760. The orbital period is 3.4 hr, and the mass function is 3 x 10(-6) M., implying a minimum companion mass of 0.018 Me.. The companion is probably degenerate; and if it is hydrogen, it is close to overflowing its Roche lobe. The only other millisecond binary radio pulsar systems with orbital period <10 hr and mass function below 10(-3) M. are the eclipsing pulsars 1957 + 20 and 1744-24A, and the very low mass binary 0021 - 72J. These pulsars are ablating their companions and may be the progenitors of isolated millisecond pulsars. PSR 1908 + 00 shows no evidence for long-duration eclipses as are seen in 1744-24A, but short-duration eclipses as in 1957 + 20 are not excluded. C1 PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DEICH, WTS (reprint author), CALTECH,105-24,PASADENA,CA 91125, USA. NR 23 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP L95 EP L98 DI 10.1086/186888 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG697 UT WOS:A1993LG69700010 ER PT J AU LAGUNA, P MILLER, WA ZUREK, WH DAVIES, MB AF LAGUNA, P MILLER, WA ZUREK, WH DAVIES, MB TI TIDAL DISRUPTIONS BY SUPERMASSIVE BLACK-HOLES - HYDRODYNAMIC EVOLUTION OF STARS ON A SCHWARZSCHILD BACKGROUND SO ASTROPHYSICAL JOURNAL LA English DT Article DE BLACK HOLE PHYSICS; HYDRODYNAMICS; METHODS, NUMERICAL; RELATIVITY ID NEARBY GALAXIES; MODEL; QSOS AB We present a three-dimensional numerical study of tidal disruption of a main-sequence star (M* = 1 M.) by a supermassive black hole (M(h) = 10(6) M.). The simulations include general relativistic effects which are important in this regime. We analyze stars in a marginally bound orbit around the black hole with pericentric separation of a few Schwarzschild radii. We show that during a close passage, as a result of relativistic effects analogous to the perihelion shift, the trajectories of the debris of the star fan out into a crescent-like shape centered on the black hole. We also discuss the increase of the central density of the star as it approaches pericentric distance, the fraction of the debris accreted by the hole, its accretion rate, the distribution of debris orbits bound to the hole, and the velocity of unbound ejected material. We compare these results with the disruption of the star by a Newtonian point mass. C1 LOS ALAMOS NATL LAB,THEORET ASTROPHYS GRP,LOS ALAMOS,NM 87545. CALTECH,PASADENA,CA 91125. RP LAGUNA, P (reprint author), PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802, USA. NR 18 TC 76 Z9 76 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP L83 EP L86 DI 10.1086/186885 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG697 UT WOS:A1993LG69700007 ER PT J AU AUBERT, B BAZAN, A BEAUGIRAUD, B COLAS, J LEFLOUR, T MAIRE, M VIALLE, JP WINGERTERSEEZ, I ZOLNIEROWSKI, YP GORDON, HA RADEKA, V RAHM, D STEPHANI, D BULGAKOV, N CHEVALLEY, JL FABJAN, CW FOURNIER, D GILDEMEISTER, O JENNI, P NESSI, M NESSITEDALDI, F PEPE, M RICHTER, W SODERQVIST, J VUILLEMIN, V BAZE, JM GOSSET, L LAVOCAT, P LOTTIN, JP MANSOULIE, B MEYER, JP RENARDY, JF TEIGER, J ZACCONE, H BATTISTONI, G CAMIN, DV CAVALLI, D COSTA, G CRAVERO, A FERRARI, A GIANOTTI, F MANDELLI, L MAZZANTI, M PERINI, L PESSINA, G SCIAMANNA, M AUGE, E CHASE, R CHOLLET, JC DELATAILLE, C FAYARD, L HRISOHO, A JEAN, P LEMEUR, G MERKEL, B NOPPE, JM PARROUR, G PETROFF, P REPELLIN, JP SCHAFFER, A SEGUIN, N UNAL, G FUGLESANG, C LEFEBVRE, M AF AUBERT, B BAZAN, A BEAUGIRAUD, B COLAS, J LEFLOUR, T MAIRE, M VIALLE, JP WINGERTERSEEZ, I ZOLNIEROWSKI, YP GORDON, HA RADEKA, V RAHM, D STEPHANI, D BULGAKOV, N CHEVALLEY, JL FABJAN, CW FOURNIER, D GILDEMEISTER, O JENNI, P NESSI, M NESSITEDALDI, F PEPE, M RICHTER, W SODERQVIST, J VUILLEMIN, V BAZE, JM GOSSET, L LAVOCAT, P LOTTIN, JP MANSOULIE, B MEYER, JP RENARDY, JF TEIGER, J ZACCONE, H BATTISTONI, G CAMIN, DV CAVALLI, D COSTA, G CRAVERO, A FERRARI, A GIANOTTI, F MANDELLI, L MAZZANTI, M PERINI, L PESSINA, G SCIAMANNA, M AUGE, E CHASE, R CHOLLET, JC DELATAILLE, C FAYARD, L HRISOHO, A JEAN, P LEMEUR, G MERKEL, B NOPPE, JM PARROUR, G PETROFF, P REPELLIN, JP SCHAFFER, A SEGUIN, N UNAL, G FUGLESANG, C LEFEBVRE, M TI PERFORMANCE OF A LIQUID ARGON PRESHOWER DETECTOR INTEGRATED WITH AN ACCORDION CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A prototype liquid argon preshower detector with a strip granularity of 2.5 mm has been tested at the CERN SPS in front of a liquid argon Accordion calorimeter. For charged tracks a signal-to-noise ratio of 9.4 and a space resolution of 340 mum were measured; the rejection power against overlapping photons produced in the decay of 50 GeV pi0's is larger than 3; the precision on the electromagnetic shower direction, determined together with the calorimeter, is better than 7 mrad above 40 GeV; the calorimeter performance behind the preshower (approximately 4X0) is fully preserved. These results make such a detector attractive for future operation at the CERN Large Hadron Collider. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CERN,CH-1211 GENEVA 23,SWITZERLAND. SPP SACLAY,DAPNIA,GIF SUR YVETTE,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20122 MILAN,ITALY. INFN SEZ,MILAN,ITALY. LAL,ORSAY,FRANCE. MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. UNIV VICTORIA,VICTORIA V8W 2Y2,BC,CANADA. RP AUBERT, B (reprint author), LAPP,ANNECY,FRANCE. OI Pessina, Gianluigi Ezio/0000-0003-3700-9757 NR 9 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 20 PY 1993 VL 330 IS 3 BP 405 EP 415 DI 10.1016/0168-9002(93)90569-4 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH886 UT WOS:A1993LH88600007 ER PT J AU AHMAD, S BONNER, BE GERE, W MUTCHLER, GS RAMBO, P TOSHKOV, S PLATNER, E CRAWFORD, HJ ENGELAGE, JM AF AHMAD, S BONNER, BE GERE, W MUTCHLER, GS RAMBO, P TOSHKOV, S PLATNER, E CRAWFORD, HJ ENGELAGE, JM TI IN-BEAM TESTS OF PROXIMITY MESH DYNODE TUBES FOR THE STAR TOF SUBSYSTEM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MAGNETIC-FIELDS; PHOTOMULTIPLIERS; PERFORMANCE AB The performance of Bicron BC404, BC408 and BC420 scintillators coupled to a Hamamatsu R3432 proximity mesh dynode photomultiplier tube was studied using pion beams from the TRIUMF cyclotron and the Brookhaven National Laboratory AGS accelerator. A system resolution of better than 100 ps seems feasible. This will satisfy the requirement for charged particle identification in the STAR detector at RHIC. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. SPACE SCI LAB,BERKELEY,CA 94720. RP AHMAD, S (reprint author), RICE UNIV,BONNER NUCL LAB,HOUSTON,TX 77251, USA. NR 11 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 20 PY 1993 VL 330 IS 3 BP 416 EP 421 DI 10.1016/0168-9002(93)90570-8 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH886 UT WOS:A1993LH88600008 ER PT J AU HELMER, RG AF HELMER, RG TI GAMMA-RAY ENERGIES FOR CALIBRATION FROM THE DECAY OF TB-161, 172HF+172LU, AND AM-241 SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The energies of a few gamma-rays from 23 to 125 keV from the decay of the radioisotopes Tb-158, 172Hf+Lu-172 and Am-241 have been determined. These energies were obtained from measurements of differences in the energies of closely spaced lines. The statistical components of the uncertainties of these energy differences range from 0.1 to 1.9 eV. Since it is a long-lived nuclide, these results should make 172Hf, which has gamma-rays from 23 to 125 keV, a useful energy calibration source. For Am-241, our value of 59.5412(2) for this widely used line differs from the previously accepted value of 59.537(1) keV. RP HELMER, RG (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 15 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 20 PY 1993 VL 330 IS 3 BP 434 EP 438 DI 10.1016/0168-9002(93)90572-Y PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH886 UT WOS:A1993LH88600010 ER PT J AU KALOSKAMIS, NI CHAN, KC CHISHTI, AA GREENBERG, JS LISTER, CJ FREEDMAN, SJ WOLANSKI, M LAST, J UTTS, B AF KALOSKAMIS, NI CHAN, KC CHISHTI, AA GREENBERG, JS LISTER, CJ FREEDMAN, SJ WOLANSKI, M LAST, J UTTS, B TI THE TRIGGER DETECTOR FOR APEX - AN ARRAY OF POSITION-SENSITIVE NAI(TL) DETECTORS FOR THE IMAGING OF POSITRONS FROM HEAVY-ION COLLISIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID TELESCOPE; SPECTROSCOPY AB We describe a 24-element position-sensitive cylindrical NaI(Tl) detector which allows positron imaging with an on-axis position resolution of 3 cm FWHM and annihilation radiation energy resolution of 13% FWHM. Two such detectors will provide the trigger for the APEX experiment at Argonne National Laborarory, which is exploring anomalous positron and electron production observed in heavy-ion collisions. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ARGONNE NATL LAB,DEPT PHYS,ARGONNE,IL 60439. SOLON TECHNOL INC,SOLON,OH 44139. RP KALOSKAMIS, NI (reprint author), YALE UNIV,A W WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511, USA. NR 28 TC 16 Z9 16 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 20 PY 1993 VL 330 IS 3 BP 447 EP 457 DI 10.1016/0168-9002(93)90574-2 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH886 UT WOS:A1993LH88600012 ER PT J AU SIMONOV, AY AF SIMONOV, AY TI LAYERED HIGH-TC SUPERCONDUCTORS IN AN AC FIELD SO PHYSICA C LA English DT Article ID CA-CU-O; ENERGY-GAP; SINGLE-CRYSTALS; ELECTROMAGNETIC RESPONSE; RAMAN-SCATTERING; ANISOTROPY; YBA2CU3O7-DELTA; CONDUCTIVITY; RESISTIVITY; EXCITATIONS AB An analysis of electrodynamic properties of high-temperature superconductors with the AC magnetic field parallel to the layers is presented. The system is modelled as a superlattice of normal (N) and superconducting (S) layers, and the bulk superconductivity is maintained by the proximity effect. The expression for the system conductivity is evaluated. The AC losses in the region of frequencies OMEGA smaller than 2DELTA (DELTA is the order parameter value at zero temperature) are non-zero even at T=0; several peaks on the frequency dependence of the conductivity are predicted. Comparison of this result with experimental data is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RI Simonov, Andrei/C-1697-2015 OI Simonov, Andrei/0000-0001-6452-0214 NR 47 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1993 VL 211 IS 3-4 BP 455 EP 466 DI 10.1016/0921-4534(93)90152-G PG 12 WC Physics, Applied SC Physics GA LK864 UT WOS:A1993LK86400020 ER PT J AU BHATTACHARYA, RN PARILLA, PA BLAUGHER, RD AF BHATTACHARYA, RN PARILLA, PA BLAUGHER, RD TI PROCESSING OF THICK-FILM ELECTRODEPOSITED THALLIUM OXIDE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID CA-CU-O; ELECTROCHEMICAL SYNTHESIS; TL2CABA2CU2OY AB Thick-film Tl-Ba-Ca-Cu-O superconductors (TBCCO) were synthesized on Ag foil and ceramic substrates using an electrodeposition process. The influence of Ag, initial stoichiometry, and reaction conditions on the phase development of TBCCO films were studied. Films deposited and reacted with no additional thallium source showed 1223 as the major phase, whereas films reacted using a two-zone thallation process showed 2223 as the primary phase formation. The TBCCO samples electrodeposited on Ag foil and annealed using the two-zone thallation process showed a critical current density of 3.2 x 10(4) A/cm2 at 76 K in zero field. The highest critical current density for films reacted without any additional thallium source was near 10(4) A/cm2 at 76 K in zero field. RP BHATTACHARYA, RN (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 25 TC 24 Z9 24 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 20 PY 1993 VL 211 IS 3-4 BP 475 EP 485 DI 10.1016/0921-4534(93)90154-I PG 11 WC Physics, Applied SC Physics GA LK864 UT WOS:A1993LK86400022 ER PT J AU KELLOGG, GL AF KELLOGG, GL TI THE EFFECT OF AN EXTERNALLY APPLIED ELECTRIC-FIELD ON THE RECONSTRUCTION OF PT(110) SO SURFACE SCIENCE LA English DT Article ID METAL-INDUCED RECONSTRUCTION; FCC 110 SURFACES; ENERGY-ION-SCATTERING; STRUCTURAL CHEMISTRY; CARBON-MONOXIDE; AU(110) SURFACE; SELF-DIFFUSION; AG(110); LEED; TRANSITION AB The influence of an externally applied electric field on the reconstruction of the Pt(110) surface has been examined by field ion microscopy. Electric field strengths up to and including 16 V/nm have no apparent effect on the thermally induced reconstruction of Pt clusters at 305 K. At field strengths of 21 V/nm and above, the thermal reconstruction process at 305 K is enhanced by ''high-temperature'' field evaporation. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87112 USA. NR 55 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD JUN 20 PY 1993 VL 290 IS 3 BP 295 EP 301 DI 10.1016/0039-6028(93)90713-T PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LJ324 UT WOS:A1993LJ32400014 ER PT J AU RAGHAVACHARI, K ROHLFING, CM AF RAGHAVACHARI, K ROHLFING, CM TI ISOMERS OF C-78 - COMPETITION BETWEEN ELECTRONIC AND STERIC FACTORS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HIGHER FULLERENES; CARBON; C-60; FORM; C-70; C84; C60 AB Ab initio Hartree-Fock (3-21G and 6-31G*(5d)) calculations on the structures and stabilities of the low-energy isomers of C78 are reported. The energy ordering of the isomers can be interpreted in terms of two different physical effects: an electronic factor which maximizes the resonance stabilization energy and a steric factor which minimizes the strain energy. The nature of the three most stable isomers (C2v, C2v', and D3) seen in two different experiments can be understood in terms of competition between these two opposing effects. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP RAGHAVACHARI, K (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 35 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 18 PY 1993 VL 208 IS 5-6 BP 436 EP 440 DI 10.1016/0009-2614(93)87169-4 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LH439 UT WOS:A1993LH43900014 ER PT J AU HESSE, M WINSKE, D AF HESSE, M WINSKE, D TI HYBRID SIMULATIONS OF COLLISIONLESS ION TEARING SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID MAGNETIC RECONNECTION; MODE; INSTABILITIES; PLASMAS AB Ion tearing in a thin collisionless neutral sheet is investigated using hybrid (particle ion, massless fluid electron) simulations in which dissipation effects are included through a model of the full electron pressure tensor in which self-consistently generated anisotropies are reduced via an isotropization time factor. The linear growth rates and ion dynamics are in qualitative agreement with linear theory and one-component simulations. The reconnection rate increases with the isotropization time. C1 LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP HESSE, M (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ELECTRODYNAM BRANCH,CODE 696,GREENBELT,MD 20771, USA. RI Hesse, Michael/D-2031-2012 NR 19 TC 38 Z9 38 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUN 18 PY 1993 VL 20 IS 12 BP 1207 EP 1210 DI 10.1029/93GL01250 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LL288 UT WOS:A1993LL28800025 ER PT J AU POINDEXTER, EH RONG, FC BUCHWALD, WR GERARDI, GJ KEEBLE, DJ WARREN, WL AF POINDEXTER, EH RONG, FC BUCHWALD, WR GERARDI, GJ KEEBLE, DJ WARREN, WL TI ELECTRICALLY-DETECTED MAGNETIC-RESONANCE NEAR THE P-DOPED N-DOPED INTERFACE OF SI JUNCTION DIODES SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL SYMP ON MAGNETIC RESONANCE IN COLLOID AND INTERFACE SCIENCE CY JUN 22-26, 1992 CL FLORENCE, ITALY SP COMMISS EUROPEAN COMMUNITIES, CNR, AZIENDA PROMOZ TURIST FIRENZE, BANCA COMMERCIALE ITALIANA, BRUKER ANAL MESSTECH, BRUCKER SPECTROSPIN ITALIANA, COMUNE FIRENZE, DITTA VANNI PICCINOTTI, ELSEVIER, EUROPEAN COLLOID & INTERFACE SOC DE ELECTRICALLY-DETECTED MAGNETIC RESONANCE; SILICON JUNCTION DIODES ID SPIN-DEPENDENT RECOMBINATION; SILICON; PLATINUM; SEMICONDUCTORS; IRRADIATION; SI/SIO2; CAPTURE AB Hyperfine structure has beep observed in the electrically-detected magnetic resonance signal from a silicon p-n junction diode. By comparing the g value, hyperfine parameters, and bandgap energy level with known species having suitable abundances of isotopes with I = 1/2, the center is tentatively assigned as a platinum moiety, of presently undetermined structure. The observation indicates the usefulness of EDMR in the study of defects in ultrasmall Si devices, and raises certain questions regarding the current theories of spin-dependent recombination. C1 WILLIAM PATERSON COLL NEW JERSEY,DEPT CHEM,WAYNE,NJ 07470. MICHIGAN TECHNOL UNIV,DEPT PHYS,HOUGHTON,MI 49931. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP POINDEXTER, EH (reprint author), USA,ELECTR TECHNOL & DEVICES LAB,FT MONMOUTH,NJ 07703, USA. RI Keeble, David /C-6633-2012 OI Keeble, David /0000-0002-5378-799X NR 31 TC 0 Z9 0 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD JUN 17 PY 1993 VL 72 BP 119 EP 125 DI 10.1016/0927-7757(93)80458-Q PG 7 WC Chemistry, Physical SC Chemistry GA LK993 UT WOS:A1993LK99300015 ER PT J AU GERARDI, GJ RONG, FC POINDEXTER, EH HARMATZ, M SHEN, H WARREN, WL AF GERARDI, GJ RONG, FC POINDEXTER, EH HARMATZ, M SHEN, H WARREN, WL TI STUDY OF A PARAMAGNETIC CENTER ON AN SIO-TREATED GAAS SURFACE SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL SYMP ON MAGNETIC RESONANCE IN COLLOID AND INTERFACE SCIENCE CY JUN 22-26, 1992 CL FLORENCE, ITALY SP COMMISS EUROPEAN COMMUNITIES, CNR, AZIENDA PROMOZ TURIST FIRENZE, BANCA COMMERCIALE ITALIANA, BRUKER ANAL MESSTECH, BRUCKER SPECTROSPIN ITALIANA, COMUNE FIRENZE, DITTA VANNI PICCINOTTI, ELSEVIER, EUROPEAN COLLOID & INTERFACE SOC DE ELECTRON PARAMAGNETIC RESONANCE; GAAS; PHOTOLUMINESCENCE; SIO ID REAL-TIME; PASSIVATION; HYDROGEN; ENHANCEMENT AB We have observed enhanced photoluminescence and an isotropic, singlet electron paramagnetic resonance (EPR) signal from samples of SI c-GaAs as a result of a thermal annealing treatment with SiO under vacuum. The treated samples showed a tenfold increase in photoluminescence. The EPR signal was detected at room temperature and was found to have a g value of 2.0017 and a linewidth of 0.1 mT. The enhanced photoluminescence and the EPR signal were both quenched by a 10 min exposure to hydrogen plasma with the sample near room temperature. Chemical and spectroscopic evidence indicates that the resonance is due to a silicon-related center near the GaAs surface. C1 USA,ELECTR TECHNOL & DEVICES LAB,FT MONMOUTH,NJ 07703. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GERARDI, GJ (reprint author), WILLIAM PATERSON COLL NEW JERSEY,DEPT CHEM,WAYNE,NJ 07470, USA. RI Schaff, William/B-5839-2009 NR 14 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD JUN 17 PY 1993 VL 72 BP 161 EP 164 DI 10.1016/0927-7757(93)80462-N PG 4 WC Chemistry, Physical SC Chemistry GA LK993 UT WOS:A1993LK99300019 ER PT J AU WHITE, JC HESS, AC AF WHITE, JC HESS, AC TI PERIODIC HARTREE-FOCK STUDY OF SILICEOUS MORDENITE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MOLECULAR-ORBITAL METHODS; CA-EXCHANGED PTILOLITE; VALENCE BASIS-SETS; ZEOLITES; FRAMEWORK; CATIONS; HYDROCARBONS; SELECTIVITY; SILICALITE; SIMULATION AB We report results of an all-electron ab initio periodic Hartree-Fock LCAO calculation on a completely dealuminated form of mordenite, Si48O96, possessing Cmcm symmetry. The reported physical properties were computed using a modified 6-21G* basis. The resulting calculation is one of the largest ab initio studies carried out to date and demonstrates the feasibility of using ab initio methods to investigate large, complex systems. The sensitivity of the total crystal energy to small changes in geometry is explored by comparing the relative stabilities of seven reported experimental mordenite structures. The total energies of the structures are found to vary by as much as 186 kcals/mol. We note that the larger the standard deviation in Si-O bond distances and O-Si-O angles the less energetically favorable the lattice will be. Crystal charge density and deformation density maps have been computed in the cylindrical channel of one of the reported crystal structures. Those calculations indicate the absence of charge density in the center of the channel (approximately 10(-6)e/bohr3) and a polarization of charge density localized near the oxygen atoms. Ab initio electrostatic potentials and electric fields in chemically important regions of the material have been computed from the Hartree-Fock ground state density. Comparisons of the ab initio electrostatic potential to those resulting from model charge distributions (Mulliken point charges and formal point charges) are made. The point charge models investigated did not provide a quantitatively correct description of the electrostatics of these lattices. The average Mulliken charges are +2.09\e\ and -1.04\e\ for silicon and oxygen, respectively. The total valence density of states and projected density of states condensed to all silicon and all oxygen atoms as well as projections into oxygen 2s and 2p orbitals have been evaluated. C1 PACIFIC NW LAB, MOLEC SCI RES CTR,POB 999,MS K1-95, RICHLAND, WA 99352 USA. NR 47 TC 60 Z9 61 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 17 PY 1993 VL 97 IS 24 BP 6398 EP 6404 DI 10.1021/j100126a013 PG 7 WC Chemistry, Physical SC Chemistry GA LH120 UT WOS:A1993LH12000013 ER PT J AU DUNLOP, JR TULLY, FP AF DUNLOP, JR TULLY, FP TI CATALYTIC DEHYDRATION OF ALCOHOLS BY OH - 2-PROPANOL - AN INTERMEDIATE CASE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYDROGEN-ATOM ABSTRACTION; GAS-PHASE REACTIONS; ALKANES; KINETICS; METHANOL; RADICALS; ALKENES AB We describe a laser photolysis/cw, laser-induced fluorescence kinetic study of the reaction between OH and 2-propanol, measured over the temperature range 293-745 K. The rate coefficient for hydrogen atom abstraction by OH from 2-propanol is best fit by the expression k(7) = 1.044 X 10(-17) T1.86 exp(736/T) cm3 molecule-1 s-1. Chain-catalytic dehydration of 2-propanol by OH is an important component of the reaction mechanism. By using isotopic substitution, we determine, as a function of temperature, the branching ratio for H atom abstraction by OH from the beta-sites of 2-propanol. Between 500 and 600 K, biexponential [OH] decays result from the unimolecular decomposition of the H2CCH(OH)CH3 intermediate. We characterize the dissociation kinetics of this HO-propene intermediate by fitting biexponential [OH] decays to a reaction model. From these results and previously established kinetic and thermodynamic data, we estimate the strength of a methyl C-H bond in 2-propanol. Measurements above T = 600 K demonstrate a role for two minor reaction channels. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. NR 23 TC 34 Z9 35 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 17 PY 1993 VL 97 IS 24 BP 6457 EP 6464 DI 10.1021/j100126a021 PG 8 WC Chemistry, Physical SC Chemistry GA LH120 UT WOS:A1993LH12000021 ER PT J AU DEBONDT, HL ROSENBLATT, J JANCARIK, J JONES, HD MORGAN, DO KIM, SH AF DEBONDT, HL ROSENBLATT, J JANCARIK, J JONES, HD MORGAN, DO KIM, SH TI CRYSTAL-STRUCTURE OF CYCLIN-DEPENDENT KINASE-2 SO NATURE LA English DT Article ID P34CDC2 PROTEIN-KINASE; SCHIZOSACCHAROMYCES-POMBE; SACCHAROMYCES-CEREVISIAE; REGULATORY PHOSPHORYLATION; CATALYTIC SUBUNIT; MOLECULAR-CLONING; SEQUENCE-ANALYSIS; MUTANT ALLELES; GENE CDC28; IDENTIFICATION AB Cyclin-dependent kinase 2 (CDK2) is a member of a highly conserved family of protein kinases that regulate the eukaryotic cell cycle. The crystal structures of the human CDK2 apoenzyme and its Mg2+ ATP complex have been determined to 2.4angstrom resolution. The structure is bi-lobate, like that of the cyclic AMP-dependent protein kinase, but contains a unique helix-loop segment that interferes with ATP and protein substrate binding and probably plays a key part in the regulation of all cyclin-dependent kinases. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV CALIF SAN FRANCISCO, DEPT PHYSIOL, SAN FRANCISCO, CA 94143 USA. NR 50 TC 746 Z9 754 U1 3 U2 24 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD JUN 17 PY 1993 VL 363 IS 6430 BP 595 EP 602 DI 10.1038/363595a0 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LH139 UT WOS:A1993LH13900045 PM 8510751 ER PT J AU SAWAFTA, R WEISS, R ACLANDER, J ALSTER, J BARAKAT, M BART, S CHRIEN, RE KRAUSS, RA JOHNSTON, K MARDOR, T MARDOR, Y MAYTALBECK, S PIASETZKY, E PILE, PH SEYFARTH, H STEARNS, RL SUTTER, RJ YAVIN, IA AF SAWAFTA, R WEISS, R ACLANDER, J ALSTER, J BARAKAT, M BART, S CHRIEN, RE KRAUSS, RA JOHNSTON, K MARDOR, T MARDOR, Y MAYTALBECK, S PIASETZKY, E PILE, PH SEYFARTH, H STEARNS, RL SUTTER, RJ YAVIN, IA TI THE INFLUENCE OF THE NUCLEAR MEDIUM ON K+ TOTAL CROSS-SECTIONS SO PHYSICS LETTERS B LA English DT Article ID SCATTERING AB The study of the K+ total cross sections on a wide range of nuclei has revealed important modifications of the free-space K+-nucleon interaction when the nucleon is embedded in a nucleus. Data indicating such an effect were first obtained in a comparison of the total cross sections on carbon and deuterium. In this letter we report new measurements on Li-6, silicon, and calcium, and demonstrate that the previously reported modifications occur quite generally. C1 TEL AVIV UNIV, RAYMOND & BEVERLY SACKLER FAC EXACT SCI, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. VASSAR COLL, POUGHKEEPSIE, NY 12601 USA. FORSCHUNGSZENTRUM JULICH, W-5170 JULICH, GERMANY. UNIV HOUSTON, HOUSTON, TX 77204 USA. TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. RP SAWAFTA, R (reprint author), BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. NR 15 TC 36 Z9 37 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 17 PY 1993 VL 307 IS 3-4 BP 293 EP 297 DI 10.1016/0370-2693(93)90222-4 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH315 UT WOS:A1993LH31500005 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI EVIDENCE FOR ETA-ETA RESONANCES IN ANTIPROTON PROTON ANNIHILATIONS AT 2950 LESS-THAN-ROOT-S-LESS-THAN 3620 MEV SO PHYSICS LETTERS B LA English DT Article AB We present the first high-statistics study of the etaeta system over the mass range 1000-3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at square-root s in the range 2950-3620 MeV. We find evidence for three states with masses 1488 +/- 10 MeV/c2, 1748 +/- 10 MeV/c2 and 2104 +/- 20 MeV/c2 respectively. C1 UNIV FERRARA,I-44100 FERRARA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. PENN STATE UNIV,UNIV PK,PA 16802. INFN,I-44100 FERRARA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. INFN,I-10125 TURIN,ITALY. UNIV TURIN,I-10125 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Patrignani, Claudia/C-5223-2009; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Patrignani, Claudia/0000-0002-5882-1747; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 10 TC 61 Z9 61 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 17 PY 1993 VL 307 IS 3-4 BP 394 EP 398 DI 10.1016/0370-2693(93)90239-E PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH315 UT WOS:A1993LH31500022 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI PRODUCTION OF THE F(2)(1520) RESONANCE IN ANTIPROTON PROTON ANNIHILATIONS AT ROOT-S=2980 AND 3526 MEV SO PHYSICS LETTERS B LA English DT Article AB We present measurements of the 2pi0 mass spectrum in proton-antiproton annihilations. The f2 (1520) resonance is strongly produced in the 3pi0 channel. Its production along with an eta is observed, but strongly suppressed. Other features are seen in the data, including the f2 (1270) and structures at 2000 MeV/c2 and above. C1 UNIV FERRARA,I-44100 FERRARA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. PENN STATE UNIV,UNIV PK,PA 16802. UNIV TURIN,I-10125 TURIN,ITALY. INFN,I-44100 FERRARA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. INFN,I-10125 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Patrignani, Claudia/C-5223-2009; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Patrignani, Claudia/0000-0002-5882-1747; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 7 TC 28 Z9 28 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 17 PY 1993 VL 307 IS 3-4 BP 399 EP 402 DI 10.1016/0370-2693(93)90240-I PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH315 UT WOS:A1993LH31500023 ER PT J AU CHEN, JB DANIELS, LM ANGELICI, RJ AF CHEN, JB DANIELS, LM ANGELICI, RJ TI STRUCTURE OF DICARBONYL(ETA(5)-PENTAMETHYLCYCLOPENTADIENYL)IRIDIUM SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB [Ir(CO)2(C10H15)], M(r) = 383.45, monoclinic, P2(1)/n, a = 7.692 (2), b = 10.565 (1), c = 15.057 (3) angstrom, beta = 98.99 (1)degrees, V = 1208.7 (4) angstrom3, Z=4, D(x) = 2.105 g cm-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu(Mo Kalpha) = 109.75 cm-1, F(000)) = 720, T = 203 K, R = 0.0177, wR = 0.0284 for 1882 unique observed [F(o)2 > 3sigma(F(o)2)] reflections. The pentamethylcyclopentadienyl ring centroid and the two CO groups form a planar triangular array around the Ir atom, the OC-Ir-CO angle is only 89.0 (2)degrees. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 7 TC 9 Z9 9 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUN 15 PY 1993 VL 49 BP 1061 EP 1063 DI 10.1107/S0108270193000630 PN 6 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LP186 UT WOS:A1993LP18600009 ER PT J AU QUINN, HR AF QUINN, HR TI TOPICS IN CP VIOLATION SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID CONSERVATION RP QUINN, HR (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 11 EP 18 DI 10.1111/j.1749-6632.1993.tb43883.x PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500003 PM 26469408 ER PT J AU BOWLES, TJ AF BOWLES, TJ TI NEUTRINO MASS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID PION DECAY; BETA-DECAY; LIMIT RP BOWLES, TJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 74 EP 83 DI 10.1111/j.1749-6632.1993.tb43887.x PG 10 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500007 PM 26469412 ER PT J AU HALL, LJ AF HALL, LJ TI TOWARDS A THEORY OF QUARK AND LEPTON MASSES SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID GRAND UNIFIED THEORIES; 3-GENERATION SUPERSTRING MODEL; EFFECTIVE GAUGE-THEORIES; TOP-QUARK; SYMMETRY-BREAKING; UNIFICATION-SCALE; YUKAWA COUPLINGS; FERMION MASSES; PREDICTIONS; SU(5) C1 LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALL, LJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 49 TC 1 Z9 1 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 376 EP 389 DI 10.1111/j.1749-6632.1993.tb43911.x PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500031 PM 26469436 ER PT J AU KINNEY, AL WHITE, RL BECKER, RH AF KINNEY, AL WHITE, RL BECKER, RH TI REDSHIFT EVOLUTION OF DAMPED LYMAN-ALPHA ABSORBERS AND THE EPOCH OF GALAXY FORMATION SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID ABSORPTION-SPECTRUM; CLOUDS; 3C-273 C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KINNEY, AL (reprint author), SPACE TELESCOPE SCI INST,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 545 EP 550 DI 10.1111/j.1749-6632.1993.tb43934.x PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500054 PM 26469459 ER PT J AU PERLMUTTER, S PENNYPACKER, C GOLDHABER, G GOOBAR, A MULLER, R DESAI, J KIM, A KIM, M NEWBERG, H SMALL, I BOYLE, B CRAWFORD, C MCMAHON, R BUNCLARK, P CARTER, D IRWIN, M TERLEVICH, R ELLIS, R GLAZEBROOK, K COUCH, W MOULD, J SMALL, T ABRAHAM, R AF PERLMUTTER, S PENNYPACKER, C GOLDHABER, G GOOBAR, A MULLER, R DESAI, J KIM, A KIM, M NEWBERG, H SMALL, I BOYLE, B CRAWFORD, C MCMAHON, R BUNCLARK, P CARTER, D IRWIN, M TERLEVICH, R ELLIS, R GLAZEBROOK, K COUCH, W MOULD, J SMALL, T ABRAHAM, R TI A SUPERNOVA AT Z = 0.458 AND COSMOLOGY SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article C1 CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. SPACE SCI LAB,BERKELEY,CA 94720. UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. ROYAL GREENWICH OBSERV,CAMBRIDGE,ENGLAND. UNIV DURHAM,DURHAM DH1 3HP,ENGLAND. UNIV NEW S WALES,SYDNEY,NSW,AUSTRALIA. CALTECH,PASADENA,CA 91125. DOMINION ASTROPHYS OBSERV,VICTORIA V8X 4M6,BC,CANADA. RP PERLMUTTER, S (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Perlmutter, Saul/I-3505-2015 OI Perlmutter, Saul/0000-0002-4436-4661 NR 5 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 554 EP 557 DI 10.1111/j.1749-6632.1993.tb43936.x PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500056 PM 26469461 ER PT J AU EPSTEIN, RI FENIMORE, EE LEONARD, PJT LINK, B AF EPSTEIN, RI FENIMORE, EE LEONARD, PJT LINK, B TI GAMMA-RAY BURSTS IN ACTIVE GALACTIC NUCLEI SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID NEUTRON-STARS; WHITE-DWARFS; EVOLUTION; APPEARANCE; BINARIES RP EPSTEIN, RI (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 40 TC 4 Z9 4 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 USA SN 0077-8923 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PD JUN 15 PY 1993 VL 688 BP 565 EP 572 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500058 ER PT J AU ANOSOV, OL BOWLES, TJ CHERRY, ML CLEVELAND, BT DAVIS, R ELLIOTT, SR FAIZOV, EL GAVRIN, VN KALIKHOV, AV KNODEL, TV KNYSHENKO, II KORNOUKHOV, VN KOUZES, RT LANDE, K MIRMOV, IN NICO, JS OBRIEN, HA OSTRINSKY, AV PSHUKOV, AM SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VM WARK, DL WILKERSON, JF ZATSEPIN, GT AF ANOSOV, OL BOWLES, TJ CHERRY, ML CLEVELAND, BT DAVIS, R ELLIOTT, SR FAIZOV, EL GAVRIN, VN KALIKHOV, AV KNODEL, TV KNYSHENKO, II KORNOUKHOV, VN KOUZES, RT LANDE, K MIRMOV, IN NICO, JS OBRIEN, HA OSTRINSKY, AV PSHUKOV, AM SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VM WARK, DL WILKERSON, JF ZATSEPIN, GT TI STATUS OF THE SOVIET-AMERICAN GALLIUM EXPERIMENT SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID SOLAR C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. UNIV PENN,PHILADELPHIA,PA 19104. PRINCETON UNIV,PRINCETON,NJ 08544. RP ANOSOV, OL (reprint author), RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117313,RUSSIA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 598 EP 604 DI 10.1111/j.1749-6632.1993.tb43943.x PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500063 PM 26469468 ER PT J AU BENNETT, DP AKERLOF, C ALCOCK, C ALLSMAN, R AXELROD, T COOK, KH FREEMAN, K GRIEST, K MARSHALL, S PARK, HS PERLMUTTER, S PETERSON, B QUINN, P RODGERS, A STUBBS, CW SUTHERLAND, W AF BENNETT, DP AKERLOF, C ALCOCK, C ALLSMAN, R AXELROD, T COOK, KH FREEMAN, K GRIEST, K MARSHALL, S PARK, HS PERLMUTTER, S PETERSON, B QUINN, P RODGERS, A STUBBS, CW SUTHERLAND, W TI THE 1ST DATA FROM THE MACHO EXPERIMENT SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID HALO C1 MT STROMLO & SIDING SPRING OBSERVA,WESTON,ACT 2611,AUSTRALIA. UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP BENNETT, DP (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Perlmutter, Saul/I-3505-2015 OI Perlmutter, Saul/0000-0002-4436-4661 NR 5 TC 7 Z9 7 U1 0 U2 2 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 612 EP 618 DI 10.1111/j.1749-6632.1993.tb43945.x PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500065 PM 26469470 ER PT J AU MACHACEK, ME CARLSON, ED HALL, LJ AF MACHACEK, ME CARLSON, ED HALL, LJ TI SELF-INTERACTING DARK-MATTER - AN ALTERNATIVE SCENARIO SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID DIFFERENTIAL MICROWAVE RADIOMETER C1 HARVARD UNIV, LYMAN LAB PHYS, CAMBRIDGE, MA 02138 USA. UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV PHYS, THEORET PHYS GRP, BERKELEY, CA 94720 USA. RP MACHACEK, ME (reprint author), NORTHEASTERN UNIV, DEPT PHYS, BOSTON, MA 02115 USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 USA SN 0077-8923 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PD JUN 15 PY 1993 VL 688 BP 681 EP 685 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500075 ER PT J AU SCHRAMM, DN AF SCHRAMM, DN TI SUMMARY OF RECENT DEVELOPMENTS IN PRIMORDIAL NUCLEOSYNTHESIS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID BIG-BANG NUCLEOSYNTHESIS; NEUTRON LIFETIME; EARLY UNIVERSE; HALO-STARS; LITHIUM; CONSTRAINTS; ABUNDANCES; COSMOLOGY; ORIGIN; BERYLLIUM AB This paper summarizes the recent observational and theoretical results on Big Bang Nucleosynthesis. In particular, it is shown that the new Pop II Li-6 results strongly support the argument that the Spite Plateau lithium is a good estimate of the primordial value. The Li-6 is consistent with the Be and Be found in Pop II stars, assuming those elements are cosmic ray produced. The HST 2D value tightens the 2D arguments and the observation of the He-4 in planetary nebula strengthens the He-3 + 2D argument as a lower bound on OMEGA(b). The new low metalicity He-4 determinations slightly raise the best primordial He-4 number and thus make a better fit and avoid a potential problem. The quark-hadron inspired inhomogeneous calculations now unanimously agree that only relatively small variations in OMEGA(b) are possible vis-a-vis the homogeneous model; hence, the robustness of OMEGA(b) approximately 0.05 is now apparent. A comparison with the ROSAT cluster data is also shown to be consistent with the standard BBN model. OMEGA(b) approximately 1 seems to be definitely excluded, so, if OMEGA = 1, as some recent observations may hint, then non-baryonic dark matter is required. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP SCHRAMM, DN (reprint author), UNIV CHICAGO,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 73 TC 1 Z9 1 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 776 EP 791 DI 10.1111/j.1749-6632.1993.tb43971.x PG 16 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500091 PM 26469496 ER PT J AU BENSADOUN, M BERSANELLI, M BONELLI, G DEAMICI, G KOGUT, A LEVIN, S LIMON, M SIRONI, G SMOOT, G VINJE, W AF BENSADOUN, M BERSANELLI, M BONELLI, G DEAMICI, G KOGUT, A LEVIN, S LIMON, M SIRONI, G SMOOT, G VINJE, W TI LOW-FREQUENCY MEASUREMENTS OF THE COSMIC MICROWAVE BACKGROUND SPECTRUM SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID TEMPERATURE; GHZ; WAVELENGTH; RADIATION; EMISSION; POLE C1 IFCTR,I-20133 MILAN,ITALY. UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. JET PROP LAB,PASADENA,CA 91109. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. NASA,GODDARD SPACE FLIGHT CTR,GSFC,USRA,GREENBELT,MD 20771. RP BENSADOUN, M (reprint author), UNIV CALIF BERKELEY,SSL,BERKELEY,CA 94720, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 792 EP 794 DI 10.1111/j.1749-6632.1993.tb43972.x PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500092 PM 26469497 ER PT J AU DEVLIN, MJ CLAPP, AC FISCHER, ML GUNDERSEN, JO HOLMES, W LANGE, AE LUBIN, PM MEINHOLD, PR RICHARDS, PL SMOOT, GF AF DEVLIN, MJ CLAPP, AC FISCHER, ML GUNDERSEN, JO HOLMES, W LANGE, AE LUBIN, PM MEINHOLD, PR RICHARDS, PL SMOOT, GF TI RESULTS FROM THE 3RD FLIGHT OF THE MILLIMETER-WAVE ANISOTROPY EXPERIMENT SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article C1 UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DEVLIN, MJ (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 809 EP 811 DI 10.1111/j.1749-6632.1993.tb43977.x PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500097 PM 26469502 ER PT J AU STEBBINS, A AF STEBBINS, A TI ON THE MEANING OF DELTA-T/T SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID UNIVERSE RP STEBBINS, A (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 824 EP 826 DI 10.1111/j.1749-6632.1993.tb43982.x PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500102 PM 26469507 ER PT J AU KREYSA, E BIERMANN, P CHINI, R GEMUND, HP HALLER, EE HASLAM, G LEMKE, R SIEVERS, A AF KREYSA, E BIERMANN, P CHINI, R GEMUND, HP HALLER, EE HASLAM, G LEMKE, R SIEVERS, A TI SHORT-WAVELENGTH ANISOTROPY MEASUREMENTS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article C1 IRAM,GRANADA,SPAIN. LBL,BERKELEY,CA. RP KREYSA, E (reprint author), MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. NR 3 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 15 PY 1993 VL 688 BP 839 EP 841 DI 10.1111/j.1749-6632.1993.tb43987.x PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM125 UT WOS:A1993LM12500107 PM 26469512 ER PT J AU GOODSON, WH LJUNG, BM MOORE, DH MAYALL, B WALDMAN, FM CHEW, K BENZ, CC SMITH, HS AF GOODSON, WH LJUNG, BM MOORE, DH MAYALL, B WALDMAN, FM CHEW, K BENZ, CC SMITH, HS TI TUMOR LABELING INDEXES OF PRIMARY BREAST CANCERS AND THEIR REGIONAL LYMPH-NODE METASTASES SO CANCER LA English DT Article DE REGIONAL LYMPH NODES; TUMOR LABELING INDEX; 5-BROMODEOXYURIDINE; BREAST CANCER; PRIMARY TUMOR; AGE; HORMONE RECEPTORS; TUMOR SIZE ID FLOW CYTOMETRIC ANALYSIS; ESTROGEN-RECEPTOR; INVOLVED NODES; CARCINOMA; INDEX AB Background. Tumor labeling index has emerged as a strong predictor of the clinical course of women with breast cancer. This study investigated whether labeling index of primary tumors correlates with labeling indices of concurrent regional node metastases. Methods. With appropriate written consent, preoperative in vivo infusion of the thymidine analogue 5-bromodeoxyuridine (BrdUrd) was used to label 109 human breast cancers. Labeled S-phase cells were identified immunohistochemically with an antibody specific to DNA-incorporated BrdUrd. Labeling index was the fraction of labeled nuclei in 2000 tumor nuclei. For 30 women, there was sufficient cancer in axillary lymph nodes to compare labeling indices in primary breast cancer and regional lymph node metastases. Results. The 30 women were from 25 to 82 years of age. Tumors were from 1 to 12 cm in size and there were from 1 to 26 positive nodes. Tumor labeling index ranged from 0.1% to 34%, (mean, 11.1%; median, 10.3%) and axillary lymph node metastasis labeling index ranged from 0.1% to 27.7% (mean, 10.8%; median. 10.0%). There was strong correlation between primary tumor labeling index and regional lymph node metastases labeling index (r = 0.82, with 95% confidence interval 0.65-0.91). The correlation persisted within subgroups according to age, tumor size, number of positive nodes, and hormone receptor status. Primary tumor and lymph node metastases labeling indices also had statistically similar relationships with age, level of hormone receptors, tumor size, and number of positive nodes. Conclusions. Primary tumor and regional node labeling indices correlate strongly; the relationship is not influenced by age. level of hormone receptors, tumor size, or number of positive nodes. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CALIF PACIFIC MED CTR,GERALDINE BRUSH CANC RES INST,SAN FRANCISCO,CA. UNIV CALIF SAN FRANCISCO,DEPT PATHOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143. RP GOODSON, WH (reprint author), UNIV CALIF SAN FRANCISCO,MED CTR,DEPT SURG,ROOM U370,BOX 0790,SAN FRANCISCO,CA 94143, USA. FU PHS HHS [P01-44768] NR 15 TC 15 Z9 16 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD JUN 15 PY 1993 VL 71 IS 12 BP 3914 EP 3919 DI 10.1002/1097-0142(19930615)71:12<3914::AID-CNCR2820711219>3.0.CO;2-N PG 6 WC Oncology SC Oncology GA LH256 UT WOS:A1993LH25600018 PM 8508357 ER PT J AU GREENBERG, KE HEBNER, GA AF GREENBERG, KE HEBNER, GA TI ELECTRON AND METASTABLE DENSITIES IN PARALLEL-PLATE RADIOFREQUENCY DISCHARGES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GLOW-DISCHARGES; HELIUM AB Electron densities were measured in continuous and pulse-modulated, 13.56-MHz, helium and argon discharges. These measurements were made in a symmetrically driven Gaseous Electronics Conference Reference Cell. Pulse modulation of the applied potential allowed observation of the time required for the electron density to achieve steady state. In general, helium discharges reached steady state in approximately 1.5 ms, taking three to ten times longer than argon discharges under similar operating conditions. As much as a threefold increase of the electron density was observed in the afterglow of a pulse-modulated helium discharge, indicative of large metastable densities. Absorption spectroscopy was used to measure the helium singlet and triplet metastable densities throughout the volume of the discharge. For a 1.0-Torr discharge, helium triplet metastable densities at the center of the discharge were as large as 2.5 x 10(11) cm-3 while the peak singlet density was 3.0 x 10(10) cm-3. The steady-state electron density varied from 3.8 x 10(10) cm-3 at 50 V to 2.3 x 10(11) cm-3 at 200 V for the 1.0-Torr helium discharge. RP GREENBERG, KE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 58 Z9 58 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8126 EP 8133 DI 10.1063/1.353451 PG 8 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900016 ER PT J AU SHIH, A COWAN, PL SOUTHWORTH, S FOTIADIS, L HOR, C KARLIN, B MOORE, F DOBISZ, E DIETRICH, H AF SHIH, A COWAN, PL SOUTHWORTH, S FOTIADIS, L HOR, C KARLIN, B MOORE, F DOBISZ, E DIETRICH, H TI LATTICE POSITION OF SI IN GAAS DETERMINED BY X-RAY STANDING-WAVE MEASUREMENTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; SILICON; IMPLANTATION; DIFFUSION AB The x-ray standing wave (XSW) technique was applied to determine the lattice location of Si impurity atoms in GaAs(100) crystals. The synchrotron radiation of X24A at the national synchrotron light source was utilized to set up backreflection XSW, an experimental geometry which drastically relaxes the otherwise stringent requirement on the lattice perfection. Specifically, the lattice sites were determined with respect to the [311] reflection planes which differentiate a Ga site from an As site. With the aid of an appropriate choice of the x-ray fluorescence filter, we were able to study GaAs(100) samples with very low levels of Si impurities. On a sample doped with 4 X 10(18) cm-3 Si during the molecular-beam epitaxy growth, we found that the Si atoms predominantly occupied the Ga sites. On both an ion-implanted sample after annealing and a sample with Si impurities introduced by thermal diffusion, about 30% of the Si atoms occupied the Ga sites, and the rest occupied random sites. The As site occupation was less than 6%. Suggestions are made for further experiments with improved sensitivity. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD. USA,ELECTR COMMAND,FT MONMOUTH,NJ 07703. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. WHITMAN COLL,DEPT PHYS,WALLA WALLA,WA 99362. RP SHIH, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 1 Z9 1 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8161 EP 8168 DI 10.1063/1.353430 PG 8 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900021 ER PT J AU RIOUX, D NILES, DW HOCHST, H AF RIOUX, D NILES, DW HOCHST, H TI ZNTE - A POTENTIAL INTERLAYER TO FORM LOW-RESISTANCE BACK CONTACTS IN CDS/CDTE SOLAR-CELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CDTE; SEMICONDUCTOR AB We studied the structural and electronic properties of the ZnTe/CdTe(100) interface with reflection high-energy electron diffraction and angle-resolved synchrotron radiation photoemission spectroscopy (ARPES). ZnTe overlayers grown at 300-degrees-C on CdTe(100) were fully strained and pseudomorphic up to almost-equal-to 16 angstrom. Beyond this coverage the ZnTe film starts to gradually relax the 6.6% in-plane lattice strain. Complete relaxation is reached at a ZnTe coverage of approximately 300 angstrom. A valence-band offset of DELTAE(v) = 0.00+/-0.05 eV was measured with ARPES at the GAMMA point. This propitious band lineup may allow for the use of a ZnTe intermediate layer at metal/CdTe structures to induce ohmic back contacts in CdS/CdTe heterojunction solar cells. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP RIOUX, D (reprint author), UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,3731 SCHNEIDER DR,STOUGHTON,WI 53589, USA. NR 19 TC 81 Z9 83 U1 2 U2 21 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8381 EP 8385 DI 10.1063/1.353406 PG 5 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900053 ER PT J AU GILLILAND, GD WOLFORD, DJ KUECH, TF BRADLEY, JA HJALMARSON, HP AF GILLILAND, GD WOLFORD, DJ KUECH, TF BRADLEY, JA HJALMARSON, HP TI MINORITY-CARRIER RECOMBINATION KINETICS AND TRANSPORT IN SURFACE-FREE GAAS/ALXGA1-XAS DOUBLE HETEROSTRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS QUANTUM WELLS; P-TYPE GAAS; INTERFACIAL RECOMBINATION; ELECTRON MOBILITIES; DOPED GAAS; PHOTOLUMINESCENCE DECAY; TEMPERATURE-DEPENDENCE; IMPURITY INCORPORATION; SPONTANEOUS EMISSION AB We have measured room-temperature band-to-band recombination decay kinetics in superior quality GaAs heterostructures, and have observed the longest lifetime (2.5 mus) observed for any GaAs/AlxGa1-xAs structure to date. Additionally, using a novel time-resolved optical photoluminescence imagining technique, analogous to the Haynes-Shockley experiment, we have also measured room-temperature minority-carrier transport in this series of ''surface-free'' GaAs/Al0.3Ga0.7As double heterostructures, measurements only possible in high-quality samples with long lifetimes and intense photoluminescence. We find the transport to be diffusive with diffusion lengths of greater than or similar to 100 mum. Further, we find, for thick structures, minority-carrier transport is hole-dominated ambipolar diffusion, as expected for high-purity n-type material. However, for thinner structures, we find that the minority-carrier transport is time dependent, changing from ambipolar diffusion at early times, as in thick structures, to electron-dominated diffusion at later times. We show that these structures become effectively p-type modulation doped due to the relative ''impurity'' and thickness of the AlxGa1-xAs compared to the GaAs. As a result, the minority-carrier species changes from holes to electrons for decreasing GaAs layer thicknesses. Cumulatively, we show the band-to-band recombination decay kinetics and carrier transport results to be in excellent qualitative and quantitative agreement. Moreover, our results are in excellent agreement with electrical transport measurements of electron and hole mobilities. Finally, with our measured room-temperature lifetimes and minority-carrier transport measurements versus GaAs layer thickness, we accurately calculate the interface recombination velocity for these structures, with the result S is similar to 40 cm/s, among the lowest ever reported for any GaAs/AlxGa1-xAs structure. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GILLILAND, GD (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,POB 218,YORKTOWN HTS,NY 10598, USA. NR 58 TC 14 Z9 14 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8386 EP 8396 DI 10.1063/1.353407 PG 11 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900054 ER PT J AU WOODS, M CLENDENIN, J FRISCH, J KULIKOV, A SAEZ, P SCHULTZ, D TURNER, J WITTE, K ZOLOTOREV, M AF WOODS, M CLENDENIN, J FRISCH, J KULIKOV, A SAEZ, P SCHULTZ, D TURNER, J WITTE, K ZOLOTOREV, M TI OBSERVATION OF A CHARGE LIMIT FOR SEMICONDUCTOR PHOTOCATHODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The Stanford Linear Accelerator Center is currently operating with a photocathode electron gun (PEG) to produce polarized electrons for its experimental program. Bunch intensities of up to 10(11) electrons within 2 ns (8 A) are required from the electron gun. Operation of PEG has demonstrated a charge limit phenomenon, whereby the charge that can be extracted from the gun with an intense laser beam saturates at significantly less than 10(11) electrons (the expected space-charge-limited charge) when the photocathode quantum efficiency is low. Studies of this charge limit phenomenon observed with a GaAs photocathode are reported. RP WOODS, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 19 TC 32 Z9 32 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8531 EP 8535 DI 10.1063/1.353382 PG 5 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900078 ER PT J AU NELSON, AJ FRIGO, SP ROSENBERG, R AF NELSON, AJ FRIGO, SP ROSENBERG, R TI VALENCY AND TYPE CONVERSION IN CUINSE2 WITH H-2 PLASMA EXPOSURE - A PHOTOEMISSION INVESTIGATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEMICONDUCTORS; SURFACE AB The effect of H-2 plasma exposure on CuInSe2 was studied by synchrotron radiation soft-x-ray photoemission spectroscopy. The low-power H-2 plasma was generated with a commercial electron cyclotron resonance plasma source using pure H-2 with the plasma exposure being performed at 200-degrees-C. In situ photoemission measurements were acquired after each plasma exposure in order to observe changes in the valence-band electronic structure as well as changes in the In 4d and Se 3d core lines. The results were correlated in order to relate changes in surface chemistry to the electronic structure. These measurements indicate that the H-2 plasma exposure type converts the CuInSe, surface to an n-type surface as well as converting the In+3 valency state to an In+1 valency state. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Rosenberg, Richard/K-3442-2012 NR 11 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8561 EP 8564 DI 10.1063/1.354063 PG 4 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900082 ER PT J AU SANFORD, TWL POUKEY, JW HALBLEIB, JA MOCK, RC AF SANFORD, TWL POUKEY, JW HALBLEIB, JA MOCK, RC TI COMPOUND-LENS INJECTOR FOR A PULSED 13-TW ELECTRON-BEAM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DYNAMICS; DIODES AB A robust injector capable of controlling the radius and angle of incidence of the pulsed, intense, annular electron beam extracted from the HERMES III accelerator is described. The injector, called the compound lens, uses a tapered anode to control the beam electrostatically, followed by a gas cell with externally applied current to control the beam magnetically. Adjustment of the anode-cathode gap and external current of the injector permits the radius and angle to be defined independently of one another. Measurements of these quantities confirm model expectations. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 6 Z9 6 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8607 EP 8614 DI 10.1063/1.353391 PG 8 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900088 ER PT J AU PRATT, ST AF PRATT, ST TI ELECTRIC-FIELD EFFECTS IN THE NEAR-THRESHOLD PHOTOIONIZATION SPECTRUM OF NITRIC-OXIDE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RESONANCE MULTIPHOTON IONIZATION; OPTICAL DOUBLE-RESONANCE; INDUCED ROTATIONAL AUTOIONIZATION; HIGHLY EXCITED-STATES; HIGH RYDBERG STATES; PHOTOELECTRON-SPECTROSCOPY; NO; RESOLUTION; ENERGY; BENZENE AB Zero-kinetic-energy-photoelectron spectroscopy (ZEKE-PES) and time-of-flight mass spectrometry are used to investigate the near-threshold, two-color photoionization of NO via the A 2SIGMA+, v = 0 level. Pulsed-field ionization of Rydberg states within 20 cm-1 of the ionization threshold is shown to proceed via a diabatic mechanism. Particular emphasis is given to the effect of predissociation on the signal produced by delayed field ionization. A small (approximately 3 V/cm) dc electric field is shown to produce a dramatic decrease in the field ionization signal in both the NO+-ion and ZEKE-electron channels. This decrease is thought to be due to an increase in the predissociation rate caused by the dc electric field. The implications of these experiments for mass-analyzed threshold ionization are discussed. RP PRATT, ST (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 67 TC 108 Z9 108 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9241 EP 9250 DI 10.1063/1.464404 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100002 ER PT J AU SCHMIDT, SC MOORE, DS SHAW, MS JOHNSON, JD AF SCHMIDT, SC MOORE, DS SHAW, MS JOHNSON, JD TI COHERENT ANTI-STOKES-RAMAN SPECTROSCOPY OF SHOCK-COMPRESSED LIQUID NITROGEN/CARBON MONOXIDE MIXTURES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS; DENSITY DEPENDENCE; GAIN SPECTROSCOPY; CARBON-MONOXIDE; FLUID NITROGEN; Q-BRANCH; SCATTERING; THERMODYNAMICS; CARS; RELAXATION AB Vibrational spectra of liquid nitrogen/carbon monoxide mixtures, shock compressed to several high-pressure/high-temperature states, were obtained using single-pulse multiplex coherent anti-Stokes Raman scattering (CARS). The experimental spectra were compared to synthetic spectra calculated with a semiclassical model for CARS intensities and using best fit vibrational frequencies, peak Raman susceptibilities, and Raman linewidths. Up to a maximum shock pressure of 9.3 GPa, both the N2 and CO vibrational frequencies were found to increase monotonically with pressure but depended strongly on the nitrogen/carbon monoxide mixture ratio. An empirical fit of the Raman frequency shifts incorporating previously published neat nitrogen and carbon monoxide data, using a functional form dependent on pressure, temperature, and mixture ratio, accurately describes both the N2 and CO shifts. The transition intensity and linewidth data suggest that thermal equilibrium of the vibrational levels is attained in less than 10 ns at these shock pressures and the vibrational temperatures obtained were used to improve the potential function used to calculate equation-of-state pressures and temperatures. The measured linewidths were different for N2 and CO and suggest that the vibrational dephasing time decreased to a few ps at the highest pressure shock state. RP SCHMIDT, SC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Moore, David/C-8692-2013 NR 44 TC 10 Z9 10 U1 2 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9379 EP 9388 DI 10.1063/1.464418 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100017 ER PT J AU OLTHOFF, JK STRICKLETT, KL VANBRUNT, RJ MOORE, JH TOSSELL, JA SAUERS, I AF OLTHOFF, JK STRICKLETT, KL VANBRUNT, RJ MOORE, JH TOSSELL, JA SAUERS, I TI DISSOCIATIVE ELECTRON-ATTACHMENT TO S2F10, S2OF10, AND S2O2F10 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SCATTERING CROSS-SECTIONS; DISULFUR DECAFLUORIDE; GAS-PHASE; SF6; ENERGIES; DECOMPOSITION; MONOCHROMATOR; HEXAFLUORIDE; MOLECULES AB The absolute cross sections for dissociative electron attachment to the molecules S2F10, S2OF10, and S2O2F10 were measured in an electron transmission experiment. The corresponding negative-ion fragments were identified in a separate mass spectrometric measurement. For S2F10, the attachment of thermal electrons (energy less than 0.1 eV) appears to result primarily in the formation of F- and SF5- with possibly a small fraction of SF4- and SF6-. The ions F-and SF5- are also produced from two attachment resonances at electron energies of about 4.5 and 9.5 eV. Both S2OF10 and S2O2F10 have unusually large dissociative attachment am sections (on the order of 10(-12) cm2) at energies near 0.1 eV. Electron attachment to S2OF10 yields primarily SOF5-, while S2O2F10 yields both SF5- an SOF5- with possible minor fractions of F-and SOF3-. Self-consistent-field calculations have been carried out on the neutral molecules and the corresponding anions to aid in the description of the observed dissociative attachment. C1 UNIV MARYLAND,DEPT CHEM & BIOCHEM,COLL PK,MD 20742. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP OLTHOFF, JK (reprint author), NATL INST STAND & TECHNOL,US DEPT COMMERCE,TECHNOL ADM,DIV ELECT,ELECTR & ELECTR ENGN LAB,GAITHERSBURG,MD 20899, USA. NR 52 TC 7 Z9 7 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9466 EP 9471 DI 10.1063/1.464378 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100026 ER PT J AU DAVIS, HF SUITS, AG LEE, YT ALCARAZ, C MESTDAGH, JM AF DAVIS, HF SUITS, AG LEE, YT ALCARAZ, C MESTDAGH, JM TI STATE-SPECIFIC REACTIONS OF BA(S-1(0)) AND BA((1)D(2)) WITH WATER AND METHANOL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ORBITAL ALIGNMENT DEPENDENCE; REAGENT APPROACH GEOMETRY; INFRARED MATRIX-ISOLATION; C-C BONDS; REDUCTIVE ELIMINATION; LASER SPECTROSCOPY; OXIDATIVE ADDITION; MOLECULAR-BEAM; ROTATIONAL ANALYSIS; ELECTRONIC-ENERGY AB The reactions of Ba(6s2 1S0) and Ba(6s5d 1D2) with water and methanol were studied under single collision conditions using crossed molecular beams. Reaction of ground state Ba(1S) +H2O led to dominant formation of BaO+H-2 at all collision energies studied (12-30 kcal/mol). Although the reaction Ba(1S)+H2O-->BaOH+H could also be observed at collision energies above the endoergicity of the reaction (13 kcal/mol), it remained a minor channel even at the highest collision energy. Electronic excitation of the Ba atom reactant to the metastable 1 D2 state led to a large enhancement in reactivity, but the products were BaOH+H rather than BaO+H-2. The dominance of BaO+H-2 from ground state Ba(1S) even at collision energies nearly equal to the Ba(1D) excitation energy of 11 395 cm-1 (approximately 32 kcal/mol) indicates that the observed reaction state specificity results from participation of different potential energy surfaces for reactions of ground and excited state atoms. Collisions of Ba(1S) and Ba(1D) with methanol led only to formation of BaOCH3+H. We observed no BaOH+CH3 or BaO+CH4, despite the fact that they are the more thermodynamically favorable channels. Although reactivity with methanol was strongly enhanced by electronic excitation of the incident Ba atom, no reaction was observed from Ba(1S) or Ba(1D)+dimethyl ether (CH3OCH3). These observations strongly suggest that the reactions leading to radical formation involve H-atom migration. C1 LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. CTR ETUD SACLAY, SERV PHOTONS ATOMES & MOLEC, F-91191 GIF SUR YVETTE, FRANCE. RI Lee, Yuan-Tseh/F-7914-2012 NR 80 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9595 EP 9609 DI 10.1063/1.464390 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100039 ER PT J AU SUN, JQ RUEDENBERG, K AF SUN, JQ RUEDENBERG, K TI GRADIENT EXTREMALS AND STEEPEST DESCENT LINES ON POTENTIAL-ENERGY SURFACES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article AB Relationships between steepest descent lines and gradient extremals on potential surfaces are elucidated. It is shown that gradient extremals are the curves which connect those points where the steepest descent lines have zero curvature. This condition gives rise to a direct method for the global determination of gradient extremals which is illustrated on the Muller-Brown surface. Furthermore, explicit expressions are obtained for the derivatives of the steepest-descent-line curvatures and, from them, for the gradient extremal tangents. With the help of these formulas, a new gradient extremal following algorithm is formulated. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP SUN, JQ (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 6 TC 72 Z9 72 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9707 EP 9714 DI 10.1063/1.464349 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100050 ER PT J AU YOUNG, DA AF YOUNG, DA TI VANDERWAALS THEORY OF 2-COMPONENT MELTING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HARD-SPHERE MIXTURES; DENSITY-FUNCTIONAL THEORY; THERMODYNAMIC PROPERTIES; PHASE-EQUILIBRIA; SOLID-SOLUTIONS; LIQUID; POTENTIALS; FLUID AB A van der Waals model based on accurate free energies for solid and liquid hard-sphere two-component mixtures is described. The model is computationally simple, it readily describes the variety of solid-liquid phase diagrams observed in metallic, ionic, and molecular systems, and in addition it permits the study of phase diagrams as a function of pressure. Several well-known empirical regularities in two-component phase diagrams are found to be predicted by the model calculations. Quantitative comparison of theory and experiment for metallic mixtures shows good agreement. RP YOUNG, DA (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 40 TC 26 Z9 25 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9819 EP 9829 DI 10.1063/1.464360 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100062 ER PT J AU ZHENG, KM GREER, SC CORRALES, LR RUIZGARCIA, J AF ZHENG, KM GREER, SC CORRALES, LR RUIZGARCIA, J TI LIVING POLY-ALPHA-METHYLSTYRENE NEAR THE POLYMERIZATION LINE .2. PHASE-DIAGRAM IN METHYLCYCLOHEXANE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NONSYMMETRIC TRICRITICAL POINTS; LIQUID SULFUR SOLUTIONS; EQUILIBRIUM POLYMERIZATION; MODEL AB We present the experimental determination of the liquid-liquid coexistence curve of living poly-alpha-methylstyrene (initiated by n-butyllithium) in methylcyclohexane. We measured the coexistence curve by measuring the phase separation temperatures of a set of samples of different mole fractions of the initial monomer, x(m)*. All the samples had the same ratio, r(= 0.008), of the mole fraction of the initiator to the mole fraction of the monomer. We also measured the polymerization line by measuring the temperatures at which increases in viscosity signaled the onset of polymerization. The measured upper critical solution point for this system is at a temperature of 274 +/- 1 K and at x(m)* = 0.18 +/- 0.02. At this x(m)*, the polymerization temperature T(p) is 285 K, well above the critical temperature. T(p) decreases as x(m)* decreases, so that the polymerization line meets the coexistence curve at about x(m)* = 0.12. We compare the predictions of a lattice model which is equivalent to the mean field limit of the dilute n --> 0 magnet model for constant r to the measured phase diagram and find good qualitative agreement. Better agreement might result if we could solve the model without taking the mean field limit. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. UNIV AUTONOMA SAN LUIS POTOSI, INST FIS MANUEL SANDOVAL VALLARTA, SAN LUIS POTOSI 78000, MEXICO. RP ZHENG, KM (reprint author), UNIV MARYLAND, DEPT CHEM & BIOCHEM, COLL PK, MD 20742 USA. NR 30 TC 20 Z9 20 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9873 EP 9880 DI 10.1063/1.464366 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100068 ER PT J AU WILCOXON, JP WILLIAMSON, RL BAUGHMAN, R AF WILCOXON, JP WILLIAMSON, RL BAUGHMAN, R TI OPTICAL-PROPERTIES OF GOLD COLLOIDS FORMED IN INVERSE MICELLES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PARTICLES; METAL; ABSORPTION; CLUSTERS; BEHAVIOR; SYSTEM; WATER AB We discuss the formation of gold metal colloids in a variety of surfactant/solvent systems. Static and dynamic light scattering, small angle x-ray and neutron scattering, TEM analysis, and UV-visible absorbance are used to characterize the kinetics of formation and final colloid stability. These gold colloids exhibit a dramatic blueshift and broadening of the plasmon resonance with decreasing colloid size. Several types of reduction method are discussed and differences between micelle (water-free) or microemulsions as reaction media are compared. Use of inverse micelles allows smaller clusters to be formed with greater long-term stability. C1 SANDIA NAT LABS, ORG 1843, ALBUQUERQUE, NM 87108 USA. SANDIA NATL UNIV, ORG 1143, ALBUQUERQUE, NM 87108 USA. RP WILCOXON, JP (reprint author), SANDIA NATL LABS, ORG 1153, ALBUQUERQUE, NM 87108 USA. NR 22 TC 201 Z9 202 U1 1 U2 34 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 15 PY 1993 VL 98 IS 12 BP 9933 EP 9950 DI 10.1063/1.464320 PG 18 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LG101 UT WOS:A1993LG10100075 ER PT J AU DAUSKARDT, RH DALGLEISH, BJ YAO, D RITCHIE, RO BECHER, PF AF DAUSKARDT, RH DALGLEISH, BJ YAO, D RITCHIE, RO BECHER, PF TI CYCLIC FATIGUE-CRACK PROPAGATION IN A SILICON-CARBIDE WHISKER-REINFORCED ALUMINA COMPOSITE - ROLE OF LOAD RATIO SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID STABILIZED ZIRCONIA; GROWTH-BEHAVIOR; CERAMICS; PREDICTION; MECHANICS; TOUGHNESS AB The characteristics of subcritical crack growth by cyclic fatigue have been examined in a silicon carbide whisker-reinforced alumina composite, with specific reference to the role of load ratio (ratio of minimum to maximum applied stress intensity, R = K(min)/K(max)); results are compared with similar subcritical crack-growth data obtained under constant load conditions (static fatigue). Using compact-tension samples cycled at ambient temperatures, cyclic fatigue-crack growth has been measured over six orders of magnitude from approximately 10(-11)-10(-5) m cycle-1 at load ratios ranging from 0.05-0.5. Growth rates (da/dN) display an approximate Paris power-law dependence on the applied stress-intensity range (DELTAK), with an exponent varying between 33 and 50. Growth-rate behaviour is found to be strongly dependent upon load ratio; the fatigue threshold, DELTAK(TH), for example, is found to be increased by over 80% at R = 0.05 compared to R = 0.5. These results are rationalized in terms of a far greater dependency of growth rates on K(max) (da/dN is-proportional-to K(max)30 compared to DELTAK(da/dN is-proportional-to DELTAK5), in contrast to fatigue behaviour in metallic materials where generally the reverse is true. Micromechanisms of crack advance underlying such behaviour are discussed in terms of time-dependent crack bridging involving either matrix grains or unbroken whiskers. C1 UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP DAUSKARDT, RH (reprint author), LAWRENCE BERKELEY LAB, CTR ADV MAT, DIV MAT SCI, BERKELEY, CA 94720 USA. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 38 TC 28 Z9 28 U1 0 U2 3 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2461 EI 1573-4803 J9 J MATER SCI JI J. Mater. Sci. PD JUN 15 PY 1993 VL 28 IS 12 BP 3258 EP 3266 DI 10.1007/BF00354244 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA LJ645 UT WOS:A1993LJ64500020 ER PT J AU LAWRENCE, JM ARKO, AJ JOYCE, JJ BLYTH, RIR BARTLETT, RJ CANFIELD, PC FISK, Z RISEBOROUGH, PS AF LAWRENCE, JM ARKO, AJ JOYCE, JJ BLYTH, RIR BARTLETT, RJ CANFIELD, PC FISK, Z RISEBOROUGH, PS TI PHOTOEMISSION SPECTRA OF CEAL3, CEBE13, CESI2, AND CECU2SI2 - WEIGHTS AND WIDTHS OF THE 4F-EMISSION FEATURES SO PHYSICAL REVIEW B LA English DT Article ID SURFACE ELECTRONIC-STRUCTURE; RARE-EARTH COMPOUNDS; CE COMPOUNDS; RESONANT PHOTOEMISSION; ANDERSON MODEL; 4F PHOTOEMISSION; SYSTEMS; TRANSITION; ENERGY; ALPHA AB We present valence-band photoemission spectra for CeAl3, CeBe13, CeSi2, CeCu2Si2, and related conventional rare-earth counterpart compounds, taken at photon energies corresponding to the giant 4d resonance with resolution - 150 meV. We take into account the 5d emission, which comprises 30% of the valence-band emission at the 4d resonance. We compare the resulting 4f emission to the predictions of the Anderson impurity model calculated in a low-order 1/N expansion, and including spin-orbit, crystal-field, and finite Coulomb correlation effects. The calculation gives order-of-magnitude fits to the data, but underestimates the spectral weight near the Fermi level by a factor of 2 and overestimates the width of the main f emission at 2 eV by a factor of 4. We argue that Ce photoemission remains an open problem and discuss several experimental and theoretical issues which need to be resolved to make further progress. C1 POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201. LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP LAWRENCE, JM (reprint author), UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717, USA. RI Riseborough, Peter/D-4689-2011; Canfield, Paul/H-2698-2014 NR 50 TC 30 Z9 30 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 15460 EP 15471 DI 10.1103/PhysRevB.47.15460 PG 12 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400008 ER PT J AU WOLFORD, DJ GILLILAND, GD KUECH, TF BRADLEY, JA HJALMARSON, HP AF WOLFORD, DJ GILLILAND, GD KUECH, TF BRADLEY, JA HJALMARSON, HP TI OPTICALLY DETERMINED MINORITY-CARRIER TRANSPORT IN GAAS/ALXGA1-X AS HETEROSTRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID MODULATION-DOPED HETEROSTRUCTURES; INTERFACE ROUGHNESS SCATTERING; DIMENSIONAL ELECTRON-GAS; III-V-COMPOUNDS; QUANTUM WELLS; TEMPERATURE-DEPENDENCE; GAAS STRUCTURES; MOBILITY; HETEROJUNCTION; SEMICONDUCTORS AB We have studied minority-carrier electron and hole transport versus temperature (30-300 K) in a series of undoped, ''interface-free,'' GaAs/Al0.3Ga0.7As double heterostructures prepared by organometallic vapor-phase epitaxy, with GaAs thicknesses from 0.1 to 10 mum. This was achieved using an all-optical, time-resolved photoluminescence-imaging technique with a spatial resolution of less than or similar to 3 mum, temporal resolution of approximately 50 ps, and spectral resolution of < 1 cm-1. This technique allows direct determination of minority-carrier transport properties, and is superior to electrical transport measurement techniques in that it is contactless, may distinguish between diffusive and nondiffusive carrier motion, and has high temporal and spectral resolution. We find all transport (electron and hole) in these structures to be diffusive. Specifically, transport in thick structures (greater than or similar to 0.5 mum) is hole-dominated ambipolar diffusion, whereas in thinner structures (less than or similar to 0.5 mum) we observe a time-dependent transition from ambipolar to electron-dominated diffusion. Minority-carrier mobilities derived from these diffusion measurements, from 300 to approximately 30 K, are in excellent agreement with both electron and hole majority-carrier mobilities. Furthermore, fits to the temperature-dependent mobilities yield deformation potentials in agreement with published electrically derived values. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WOLFORD, DJ (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,POB 218,YORKTOWN HTS,NY 10598, USA. NR 40 TC 14 Z9 14 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 15601 EP 15608 DI 10.1103/PhysRevB.47.15601 PG 8 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400026 ER PT J AU PEDEN, CHF ROGERS, JW SHINN, ND KIDD, KB TSANG, KL AF PEDEN, CHF ROGERS, JW SHINN, ND KIDD, KB TSANG, KL TI THERMALLY GROWN SI3N4 THIN-FILMS ON SI(100) - SURFACE AND INTERFACIAL COMPOSITION SO PHYSICAL REVIEW B LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; SIO2/SI INTERFACE; NH3; NITRIDATION; SILICON; PHOTOEMISSION; AMMONIA; XPS; DECOMPOSITION; TEMPERATURE AB Synchrotron photoemission measurements of the Si(2p, and N(1s) levels have been made on Si3N4 thin films grown in situ by high-temperature reaction of Si(100) with NH3. Surface sensitivity is enhanced in comparison to laboratory photoemission experiments by selecting photon energies that minimize the photoelectron mean free path in the nitride film. From the results, we are able to determine not only the types of chemical species present, but their approximate location within the film as well. Careful analysis of the Si(2p) photoemission spectra reveals the presence of a unique silicon species with a Si(2p) binding energy intermediate between elemental silicon and silicon in Si3N4. Furthermore, the persistence of this species with increasing nitride-film thickness supports its assignment to a monolayer of silicon at the outermost surface layer, on top of the growing stoichiometric Si3N4 film. These surface silicon atoms can be distinguished from silicon atoms in intermediate oxidation states at the Si3N4/Si interface. The spectroscopic evidence for chemically distinct surface, nitride, and interfacial silicon is discussed in terms of the silicon nitridation mechanism. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. OI Peden, Charles/0000-0001-6754-9928 NR 64 TC 98 Z9 98 U1 0 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 15622 EP 15629 DI 10.1103/PhysRevB.47.15622 PG 8 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400028 ER PT J AU LO, CW SHUH, DK CHAKARIAN, V DURBIN, TD VAREKAMP, PR YARMOFF, JA AF LO, CW SHUH, DK CHAKARIAN, V DURBIN, TD VAREKAMP, PR YARMOFF, JA TI XEF2 ETCHING OF SI(111) - THE GEOMETRIC STRUCTURE OF THE REACTION LAYER SO PHYSICAL REVIEW B LA English DT Article ID PHOTON-STIMULATED DESORPTION; SI(100)(2X1) SURFACE; FLUORINE-ATOMS; INITIAL-STAGES; SILICON; PHOTOEMISSION; CORE; LEVEL; SPECTROSCOPY; EXCITATIONS AB Si(111)-7X7 is exposed to XeF2 in ultrahigh vacuum and examined with soft-x-ray photoelectron spectroscopy (SXPS) and photon-stimulated desorption (PSD). The exposures encompass the entire range from chemisorption to steady state etching. By taking into account the different surface sensitivities of SXPS and PSD, the microscopic structure of the surface fluorosilyl reaction layer is obtained as a function of exposure, and the reaction process is modeled. It is found that the reaction-layer structure passes through four distinct exposure regimes. Steric hindrance between the F atoms of neighboring fluorosilyl groups and defects in the substrate are responsible for the evolution of the reaction-layer structure. When steady-state etching is reached, the reaction layer evolves to a ''tree'' structure of fluorosilyl chains terminated at the surface by SiF3 groups. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LO, CW (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 47 TC 67 Z9 68 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 15648 EP 15659 DI 10.1103/PhysRevB.47.15648 PG 12 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400031 ER PT J AU SIMMONS, JA LYO, SK KLEM, JF SHERWIN, ME WENDT, JR AF SIMMONS, JA LYO, SK KLEM, JF SHERWIN, ME WENDT, JR TI SUBMICROMETER CONTROL OF 2-DIMENSIONAL 2-DIMENSIONAL MAGNETOTUNNELING IN DOUBLE-WELL HETEROSTRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELDS AB Interwell two-dimensional-two-dimensional (2D-2D) tunneling in a density-imbalanced double-well heterostructure is studied in an in-plane magnetic field using a gated-bridge technique which does not require independent contacts to the two 2D electron layers. Two sharp peaks in the tunneling conductance at B less-than-or-equal-to 1.3 T and B = 5-6 T are explained using a linear-response theory which incorporates finite scattering and is based on a field-induced momentum shift of the two quantum wells' Fermi circles. A second gate is used to locally enhance tunneling on a submicrometer length scale. RP SIMMONS, JA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 46 Z9 46 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 15741 EP 15744 DI 10.1103/PhysRevB.47.15741 PG 4 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400043 ER PT J AU PAYNE, AP LAIRSON, BM BRENNAN, S DANIELS, BJ RENSING, NM CLEMENS, BM AF PAYNE, AP LAIRSON, BM BRENNAN, S DANIELS, BJ RENSING, NM CLEMENS, BM TI EPITAXIAL STRAIN AND THE GROWTH OF CU(001) ON FE(001) SO PHYSICAL REVIEW B LA English DT Note ID ENERGY; FILMS AB In order to study the role of epitaxial strain in stabilizing a body-centered cubic (bcc) modification of Cu, we have made high-resolution, in situ measurements of the in-plane elastic film strain associated with epitaxial growth of Cu(001) on Fe(001). Using grazing-incidence x-ray scattering with synchrotron radiation, we observe in-plane elastic strains in the Cu as large as 7.6% occurring at a coverage of 2 equivalent monolayers. These tensile strains tetragonally distort the face-centered cubic (fcc) Cu lattice, resulting in a body-centered tetragonal structure. A true bcc structure is not observed. As the film grows thicker, the epitaxial strain decays in a continuous, monotonic manner resulting in a slightly strained fcc structure by 10 equivalent monolayers. The observed strain relaxation agrees with equilibrium theory, suggesting that the growth of bcc Cu is contingent upon kinetic barriers to misfit dislocation nucleation and/or movement. C1 STANFORD UNIV, STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA 94305 USA. RP PAYNE, AP (reprint author), STANFORD UNIV, DEPT MAT SCI & ENGN, STANFORD, CA 94305 USA. NR 15 TC 9 Z9 9 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 23 BP 16064 EP 16067 DI 10.1103/PhysRevB.47.16064 PG 4 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400101 ER PT J AU YANG, LH SMITH, AP BENEDEK, R KOELLING, DD AF YANG, LH SMITH, AP BENEDEK, R KOELLING, DD TI EFFECT OF SEMICORE BANDING ON HEAVY-ALKALI-METAL LATTICE-CONSTANTS - CORRECTIONS TO THE FROZEN-CORE APPROXIMATION SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE PROPERTIES; DENSITY-FUNCTIONAL THEORY; ELECTRONIC-STRUCTURE; ENERGY CALCULATIONS; PSEUDOPOTENTIALS; SYSTEMS; CESIUM; MODEL; CS AB Equilibrium lattice constants and bulk moduli of the heavy alkali metals K, Rb, and Cs were calculated using the Troullier-Martins pseudopotentials and plane-wave basis functions. The treatment of the outermost p-shell electrons as Bloch states yielded lattice constants 2-3% larger than those obtained within the frozen-core approximation (including the partial core correction of Louie, Froyen, and Cohen [Phys. Rev. B 26, 1738 (1982)]), which narrows a long-standing discrepancy between local-density-functional theory and experiment. Predicted bulk moduli are 30-50% larger than measured values, within either treatment. The band dispersion of the semicore states (with bandwidths 0.067, 0.14, and 0.25 eV for K, Rb, and Cs) is attributed primarily to core-electron-conduction-electron hybridization rather than direct core-core overlap. The semicore density of states has a flat line shape, rather than the peaked shape expected for an idealized tight-binding band. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP LAWRENCE LIVERMORE NATL LAB, DIV PHYS H, LIVERMORE, CA 94551 USA. NR 45 TC 9 Z9 9 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 24 BP 16101 EP 16106 DI 10.1103/PhysRevB.47.16101 PG 6 WC Physics, Condensed Matter SC Physics GA LJ156 UT WOS:A1993LJ15600001 ER PT J AU WANG, LH ZHU, Y ZENG, FA ZHAO, HL FENG, SC AF WANG, LH ZHU, Y ZENG, FA ZHAO, HL FENG, SC TI ANISOTROPIC SPECTRA OF MAGNETOPLASMONS IN WIDE PARABOLIC QUANTUM-WELL SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID HALL-EFFECT REGIME; MAGNETIC-FIELD; COLLECTIVE EXCITATIONS; ELECTRON-STATES; EDGE STATES AB Anisotropic intrasubband magnetoplasmons of an electron gas in a wide parabolic quantum well are obtained by using a method within the framework of the random-phase approximation. The symmetries and shapes of the various perturbed Hartree potentials along the confining direction at B=0 are found analytically. Anisotropy of the intrasubband modes in the presence of a longitudinal magnetic field perpendicular to the confinement direction is revealed and explained. We also make a striking prediction that a strong longitudinal magnetic field can give rise to an additional one-dimensional-like undamped intrasubband magnetoplasmon mode which is well within the experimentally accessible range. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. NR 14 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 24 BP 16326 EP 16332 DI 10.1103/PhysRevB.47.16326 PG 7 WC Physics, Condensed Matter SC Physics GA LJ156 UT WOS:A1993LJ15600030 ER PT J AU POON, HC KHANRA, BC KING, TS AF POON, HC KHANRA, BC KING, TS TI SURFACE-COMPOSITION OF CLEAN AND OXYGEN-COVERED AU3CU ALLOY SO PHYSICAL REVIEW B LA English DT Article ID BETHE-LATTICE METHOD; BINDING ISING-MODEL; TRANSITION-METAL ALLOYS; ELECTRONIC-STRUCTURE; BINARY-ALLOYS; SEGREGATION; CHEMISORPTION; DENSITY; STATES AB Surface segregation behavior of clean and oxygen-adsorbed Au3Cu systems has been studied theoretically within the tight-binding formalism. It has been found that for the clean Au3Cu system the top layer is Au enriched, while the second layer is Cu enriched. In the presence of a monolayer of oxygen atoms, on the other hand, there is a segregation reversal in the top layer which becomes Cu enriched. The above findings are in total agreement with the very recent experimental impact collision ion-scattering spectroscopic results. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NATL UNIV SINGAPORE,DEPT PHYS,SINGAPORE 0511,SINGAPORE. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. NR 25 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 24 BP 16494 EP 16498 DI 10.1103/PhysRevB.47.16494 PG 5 WC Physics, Condensed Matter SC Physics GA LJ156 UT WOS:A1993LJ15600055 ER PT J AU TIDSWELL, IM MARKOVIC, NM LUCAS, CA ROSS, PN AF TIDSWELL, IM MARKOVIC, NM LUCAS, CA ROSS, PN TI IN-SITU X-RAY-SCATTERING STUDY OF THE AU(001) RECONSTRUCTION IN ALKALINE AND ACIDIC ELECTROLYTES SO PHYSICAL REVIEW B LA English DT Article ID 100 CRYSTAL FACES; SURFACE RECONSTRUCTIONS; GOLD SURFACES; AU; DIFFRACTION; AU(100); ANIONS; ELECTRODES; PLATINUM; REFLECTIVITY AB X-ray scattering from the solid/liquid interface of a Au(001) single crystal in 0.1 M potassium hydroxide and 0.1 M perchloric acid electrolytes has been measured. In both solutions the Au surface reconstruction consists of an incommensurate-hexagonal monolayer with a structure similar to the clean annealed vacuum surface at room temperature. In KOH electrolyte the reconstruction is aligned along the (110] direction, unlike the vacuum and perchloric acid interfaces, where the reconstruction is rotated +/-(05-0.8)-degrees from the [110] direction. In KOH solution the reconstruction forms rapidly at electrode potentials below -0.25 V (versus the saturated calomel electrode) and is lifted in a narrow potential region (40 mV) above -0.10 V, very close to the estimated potential of zero charge (PZC) for the reconstructed surface. In perchloric acid solution the reconstruction forms much more slowly at potentials just below the PZC of the unreconstructed surface, and is stable up to approximately 0.30 V, which is just positive of the PZC. In KOH solution the stability of the reconstruction is controlled primarily by the interaction of the surface with hydroxyl anions. The controlling mechanism in perchloric acid is unclear. C1 UNIV BELGRADE,ICTM,INST ELECTROCHEM,BELGRADE,YUGOSLAVIA. RP TIDSWELL, IM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. OI Lucas, Christopher/0000-0001-5743-3868 NR 44 TC 64 Z9 64 U1 0 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1993 VL 47 IS 24 BP 16542 EP 16553 DI 10.1103/PhysRevB.47.16542 PG 12 WC Physics, Condensed Matter SC Physics GA LJ156 UT WOS:A1993LJ15600062 ER PT J AU HAWKING, SW LAFLAMME, R LYONS, GW AF HAWKING, SW LAFLAMME, R LYONS, GW TI ORIGIN OF TIME ASYMMETRY SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM COSMOLOGY; UNIVERSE; INTEGRATION AB It is argued that the observed thermodynamic arrow of time must arise from the boundary conditions of the Universe. We analyze the consequences of the no-boundary proposal, the only reasonably complete set of boundary conditions that has been put forward. We study perturbations of a Friedmann model containing a massive scalar field, but our results should be independent of the details of the matter content. We find that gravitational wave perturbations have an amplitude that remains in the linear regime at all times and is roughly time symmetric about the time of maximum expansion. Thus gravitational wave perturbations do not give rise to an arrow, of time. However, density perturbations behave very differently. They are small at one end of the Universe's history, but grow larger and become nonlinear as the Universe gets larger. Contrary to an earlier claim, the density perturbations do not get small again at the other end of the Universe's history. They therefore give rise to a thermodynamic arrow of time that points in a constant direction while the Universe expands and contracts again. The arrow of time does not reverse at the point of maximum expansion. One has to appeal to the weak anthropic principle to explain why we observe the thermodynamic arrow to agree with the cosmological arrow, the direction of time in which the Universe is expanding. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HAWKING, SW (reprint author), UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,SILVER ST,CAMBRIDGE CB3 9EW,ENGLAND. NR 24 TC 51 Z9 51 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1993 VL 47 IS 12 BP 5342 EP 5356 DI 10.1103/PhysRevD.47.5342 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH172 UT WOS:A1993LH17200020 ER PT J AU KIM, CJ KIM, SY KIM, YB AF KIM, CJ KIM, SY KIM, YB TI GLOBAL NONTOPOLOGICAL VORTICES SO PHYSICAL REVIEW D LA English DT Article ID NON-TOPOLOGICAL SOLITONS; 3 SPACE-DIMENSIONS; BLACK-HOLES; Q-BALLS; FIELD; STARS; STRINGS; SUPERCONDUCTIVITY AB Nontopological solitons with nonzero vorticities are considered in the theory of a complex scalar field with renormalizable self-interactions in (2 + 1)-dimensional spacetime. These nontopological vortices are characterized by the fact that they carry a nonzero angular momentum in addition to the global Abelian charge. The existence of such objects is shown in rotationally symmetric cases. Such rotationally symmetric configurations are ring shaped around the center. Their stability against decay into mesons is demonstrated analytically. C1 SEOUL NATL UNIV,DEPT PHYS,SEOUL 151742,SOUTH KOREA. ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027. RP KIM, CJ (reprint author), SEOUL NATL UNIV,CTR THEORET PHYS,SEOUL 151742,SOUTH KOREA. NR 32 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1993 VL 47 IS 12 BP 5434 EP 5443 DI 10.1103/PhysRevD.47.5434 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH172 UT WOS:A1993LH17200031 ER PT J AU WEINSTEIN, M AF WEINSTEIN, M TI HAMILTONIANS, PATH-INTEGRALS, AND A NEW RENORMALIZATION-GROUP SO PHYSICAL REVIEW D LA English DT Article ID LATTICE GAUGE-THEORY; T-EXPANSION; VARIATIONAL-METHODS; SYSTEMS; FIELD AB New nonperturbative methods for dealing with Hamiltonian systems are introduced. The derivation of these methods requires identities for rewriting exponentials of sums of operators which are different from the usual Campbell-Hausdorff formula. These identities allow one to derive approximations to e(-deltaH) which are correct to higher order in delta and which contain fewer terms than the Campbell-Hausdorff formula. This allows one to generate path-integral actions which are more accurate for finite-size steps in time and which can be exploited to improve the rate of convergence of Monte Carlo calculations. To show that these methods allow one to include effects which show up in the stationary-phase approximation to the path integral, e.g., instantons, solitons, etc., I not only derive the connection between the Hamiltonian and path-integral formalism but the relationship between a specific stationary-phase approximation and the corresponding Hamiltonian calculation. My focus, however, is the direct application of these new identities to the study of nonperturbative Hamiltonian dynamics. I show that these methods are easier to apply and give better results than those based upon the naive t-expansion, block mean-field, or real-space renormalization ideas. Comparison of these older methods with the computational tools introduced in this paper are discussed in the context of simple examples. It is shown that the new methods allow one to extrapolate answers to finite t without the use of Pade approximants. RP WEINSTEIN, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 28 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1993 VL 47 IS 12 BP 5499 EP 5520 DI 10.1103/PhysRevD.47.5499 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH172 UT WOS:A1993LH17200039 ER PT J AU BURDEN, CJ ROBERTS, CD AF BURDEN, CJ ROBERTS, CD TI GAUGE COVARIANCE AND THE FERMION-PHOTON VERTEX IN 3-DIMENSIONAL AND 4-DIMENSIONAL, MASSLESS QUANTUM ELECTRODYNAMICS SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL-SYMMETRY-BREAKING; PROPAGATOR AB In the quenched approximation, the gauge covariance properties of three vertex Ansatze in the Schwinger-Dyson equation for the fermion self-energy are analyzed in three- and four-dimensional quantum electrodynamics. Based on the Cornwall-Jackiw-Tomboulis effective action, it is inferred that the spectral representation used for the vertex in the gauge technique cannot support dynamical chiral symmetry breaking. A criterion for establishing whether a given Ansatz can confer gauge covariance upon the Schwinger-Dyson equation is presented and the Curtis and Pennington Ansatz is shown to satisfy this constraint. We obtain an analytic solution of the Schwinger-Dyson equation for quenched, massless three-dimensional quantum electrodynamics for arbitrary values of the gauge parameter in the absence of dynamical chiral symmetry breaking. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BURDEN, CJ (reprint author), AUSTRALIAN NATL UNIV,RES SCH PHYS SCI & ENGN,DEPT THEORET PHYS,GPO BOX 4,CANBERRA,ACT 2601,AUSTRALIA. RI Burden, Conrad/D-5556-2016; OI Burden, Conrad/0000-0003-0015-319X; Roberts, Craig/0000-0002-2937-1361 NR 24 TC 56 Z9 59 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1993 VL 47 IS 12 BP 5581 EP 5588 DI 10.1103/PhysRevD.47.5581 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH172 UT WOS:A1993LH17200048 ER PT J AU PISARSKI, RD AF PISARSKI, RD TI DAMPING RATES FOR MOVING PARTICLES IN HOT QCD SO PHYSICAL REVIEW D LA English DT Article ID QUARK-GLUON PLASMA; HARD THERMAL LOOPS; GAUGE-THEORIES; FINITE TEMPERATURE; ENERGY-LOSS; PROPAGATOR; AMPLITUDES; IDENTITIES; SPECTRUM; FERMION AB Using a program of perturbative resummation I compute the damping rates for fields at nonzero spatial momentum to leading order in weak coupling in hot QCD. Sum rules for spectral densities are used to simplify the calculations. For massless fields the damping rate has an apparent logarithmic divergence in the infrared limit, which is cut off by the screening of static magnetic fields (''magnetic mass''). This demonstrates how at high temperature even perturbative quantities are sensitive to nonperturbative phenomena. RP BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 51 TC 128 Z9 128 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD JUN 15 PY 1993 VL 47 IS 12 BP 5589 EP 5600 DI 10.1103/PhysRevD.47.5589 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH172 UT WOS:A1993LH17200049 ER PT J AU HOU, SY PHILLIPS, JM WERDER, DJ TIEFEL, TH FLEMING, RM MARSHALL, JH SIEGAL, MP AF HOU, SY PHILLIPS, JM WERDER, DJ TIEFEL, TH FLEMING, RM MARSHALL, JH SIEGAL, MP TI PRECIPITATES IN YBA2CU3O7-DELTA THIN-FILMS ANNEALED AT LOW-OXYGEN PARTIAL-PRESSURE SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXIAL BA2YCU3O7-X FILMS; LAALO3(100); GROWTH AB We have studied the precipitates in YBa2Cu3O7-delta(YBCO) thin films grown by the BaF2 process in p(O2)= 4 Torr and 700-degrees-C. While stoichiometric films result in BaCuO2 surface precipitates, we have found Y2Cu2O5 precipitates embedded in the matrix of the same film. Off stoichiometric films with Ba/Y < 1.5 have a precipitate-free surface but with higher abundance of Y2Cu2O5 in the film matrix. The estimated densities of the two precipitates favor a stoichiometric YBCO film matrix. This behavior is not explainable in terms of phase equilibria and is attributed to kinetic effects. The electrical properties of the films degrade as the Ba/Y ratio deviates from 2.00. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HOU, SY (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Fleming, Robert/B-1248-2008 NR 13 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 14 PY 1993 VL 62 IS 24 BP 3201 EP 3203 DI 10.1063/1.109624 PG 3 WC Physics, Applied SC Physics GA LF990 UT WOS:A1993LF99000048 ER PT J AU HOWELL, LH AF HOWELL, LH TI NUMERICAL CONFORMAL MAPPING OF CIRCULAR-ARC POLYGONS SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE SCHWARZ-CHRISTOFFEL TRANSFORMATION; SCHWARZIAN; ORDINARY DIFFERENTIAL EQUATION; ELONGATED REGIONS; CROWDING; CONFORMAL MAPPING ID SCHWARZ-CHRISTOFFEL TRANSFORMATION AB Solutions to the Schwarzian differential equation are conformal maps from the upper half-plane to circular arc polygons, plane regions bounded by straight line segments and arbitrary arcs of circles. We develop methods for numerically integrating this equation, both directly and through the use of a related linear differential equation. Particular attention is given to the behavior near corner singularities. We also derive alternate versions of the transformation which map from the unit disk and from an infinite strip. While the former may be of primarily theoretical interest, the latter can be used to map highly elongated regions such as channels for internal flow problems. Such regions are difficult or impossible to map from the disk or the half-plane due to the so-called crowding phenomenon. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 17 TC 14 Z9 14 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 14 PY 1993 VL 46 IS 1-2 BP 7 EP 28 DI 10.1016/0377-0427(93)90284-I PG 22 WC Mathematics, Applied SC Mathematics GA LH600 UT WOS:A1993LH60000002 ER PT J AU FLORYAN, JM ZEMACH, C AF FLORYAN, JM ZEMACH, C TI SCHWARZ-CHRISTOFFEL METHODS FOR CONFORMAL MAPPING OF REGIONS WITH A PERIODIC BOUNDARY SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE CONFORMAL MAPPING; SCHWARZ-CHRISTOFFEL EQUATION; NUMERICAL GRID GENERATION AB Numerical conformal mapping methods for regions with a periodic boundary have been developed. These methods are based on the generalized Schwarz-Christoffel equation and can deal with boundary curves of arbitrary forms, i.e., made up of one or more rectifiable Jordan curves. High-order quadrature rules have been implemented in order to increase accuracy of the mapping. This is of particular relevance to highly accurate grid generation techniques required by, for example, implementation of high-order compact finite-difference discretization schemes. C1 UNIV WESTERN ONTARIO,FAC ENGN SCI,DEPT MECH ENGN,LONDON N6A 3K7,ONTARIO,CANADA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87544. NR 11 TC 10 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 14 PY 1993 VL 46 IS 1-2 BP 77 EP 102 DI 10.1016/0377-0427(93)90288-M PG 26 WC Mathematics, Applied SC Mathematics GA LH600 UT WOS:A1993LH60000006 ER PT J AU OGAZA, S KOWNACKI, J CARPENTER, MP GASCON, J HAGEMANN, GB IWATA, Y JENSEN, HJ KOMATSUBARA, T NYBERG, J SLETTEN, G TJOM, PO WALUS, W HAMAMOTO, I AF OGAZA, S KOWNACKI, J CARPENTER, MP GASCON, J HAGEMANN, GB IWATA, Y JENSEN, HJ KOMATSUBARA, T NYBERG, J SLETTEN, G TJOM, PO WALUS, W HAMAMOTO, I TI SHAPES, ELECTROMAGNETIC PROPERTIES AND ENHANCED E1 STRENGTH IN LU-169 SO NUCLEAR PHYSICS A LA English DT Article DE SM-154(F-19, 4N) LU-169; E = 85 MEV; MEASURED E-GAMMA,GAMMA-GAMMA COINC; I-GAMMA; DOPPLER-SHIFT ATTENUATION; LU-169 DEDUCED LEVELS; I-GAMMA; ROTATIONAL BAND-STRUCTURE; N-OMEGA-C; CONFIGURATION-DEPENDENT SHAPE AND PAIRING; LIFETIMES; TRANSITION QUADRUPOLE MOMENTS; B(M1)/B(E2), B(E1)-VALUES; COMPARISON TO PARTICLE-ROTOR CALCULATIONS INCLUDING OCTUPOLE SOFTNESS; ENRICHED TARGET; ARRAY OF COMPTON-SUPPRESSED GE-DETECTORS ID RARE-EARTH NUCLEI; HIGH-SPIN STATES; TRANSITION-PROBABILITIES; BAND CROSSINGS; DEPENDENCE; ENERGIES; RATES AB Rotational bands in Lu-169 previously observed via (p, 3n) and (alpha, 4n) reactions were extended by 8-14 units of angular momentum using the Sm-154(F-19, 4n) reaction and the Nordball detector array. By analysis of gammagamma coincidence relations and gamma-ray angular correlations we have established the [541]1/2-, alpha = +1/2 band to 57/2HBAR, the [514]9/2- bands to 47/2HBAR, the [404]7/2+ bands to 53/2HBAR and the [411]1/2+, alpha = 1/2 to 47/2 (55/2) h. The bands belonging to the [411]1/2+ and [402]5/2+ configurations with alpha = +1/2 appear to be rather mixed in the low spin region. One of these bands is established to 45/2 (49/2) units of spin. The transitions interconnecting the signature partners, in the bands based on the [514]9/2-and [404]7/2+ Nilsson orbitals, as well as in and between the strongly mixed [411]1/2+ and [402]5/2+ bands are compared to particle-rotor model calculations. By DSAM analysis, lifetimes and thereby transition quadrupole moments for the band built on the configuration h9/2[541]1/2-, alpha = +1/2 could be extracted. The abnormal alignment pattern at the vi13/2 crossing for the h9/2[541]1/2- band is analysed in terms of a difference in both deformation and neutron pairing compared to the other less polarizing configurations. The influence of octupole modes on the strength of observed [411]1/2+ double-line arrow pointing right [541]1/2- E1 transitions as well as on observed spin-flip, [514]9/2- double-line arrow pointing right [404]7/2+, E1 transitions is investigated theoretically and compared to the experimental data. C1 UNIV COPENHAGEN,NIELS BOHR INST,TANDEM ACCELERATOR LAB,DK-4000 ROSKILDE,DENMARK. LUND UNIV,DEPT MATH PHYS,S-22100 LUND,SWEDEN. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. UNIV WARSAW,INST EXPTL PHYS,PL-00325 WARSAW,POLAND. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV MONTREAL,DEPT PHYS,MONTREAL H3C 3J7,QUEBEC,CANADA. HIROSHIMA UNIV,DEPT PHYS,HIROSHIMA 730,JAPAN. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. UNIV UPPSALA,SVEDBERG LAB,S-75121 UPPSALA,SWEDEN. UNIV OSLO,DEPT PHYS,OSLO 3,NORWAY. JAGIELLONIAN UNIV,PL-31007 KRAKOW,POLAND. RI Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 32 TC 28 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 14 PY 1993 VL 559 IS 1 BP 100 EP 136 DI 10.1016/0375-9474(93)90182-W PG 37 WC Physics, Nuclear SC Physics GA LT376 UT WOS:A1993LT37600005 ER PT J AU NILSEN, J KOCH, JA SCOFIELD, JH MACGOWAN, BJ MORENO, JC DASILVA, LB AF NILSEN, J KOCH, JA SCOFIELD, JH MACGOWAN, BJ MORENO, JC DASILVA, LB TI OBSERVATION OF HYPERFINE SPLITTING ON AN X-RAY LASER TRANSITION SO PHYSICAL REVIEW LETTERS LA English DT Article AB We report the first observation of hyperfine splitting on an x-ray laser transition. Hyperfine splitting can have a major impact on laser gain and help explain anomalous behavior and poor performance of x-ray lasers with odd Z. In our experiments we measure the line shape of the J = 0 --> 1, 3p --> 3s transition in Ne-like Nb and Zr and observe a 28 mangstrom splitting between the two largest hyperfine components in the Nb (Z = 41) line at 145.9 angstrom, in good agreement with theory. As predicted, no splitting is observed in Zr (Z = 40). C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 12 TC 22 Z9 23 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 14 PY 1993 VL 70 IS 24 BP 3713 EP 3715 DI 10.1103/PhysRevLett.70.3713 PG 3 WC Physics, Multidisciplinary SC Physics GA LF942 UT WOS:A1993LF94200010 ER PT J AU BAUMANN, P DANIEL, H GRUNEWALD, S HARTMANN, FJ LIPOWSKY, R MOSER, E SCHOTT, W VONEGIDY, T ACKERBAUER, P BREUNLICH, WH FUCHS, M JEITLER, M KAMMEL, P MARTON, J NAGELE, N WERNER, J ZMESKAL, J BOSSY, H CROWE, KM SHERMAN, RH LOU, K PETITJEAN, C MARKUSHIN, VE AF BAUMANN, P DANIEL, H GRUNEWALD, S HARTMANN, FJ LIPOWSKY, R MOSER, E SCHOTT, W VONEGIDY, T ACKERBAUER, P BREUNLICH, WH FUCHS, M JEITLER, M KAMMEL, P MARTON, J NAGELE, N WERNER, J ZMESKAL, J BOSSY, H CROWE, KM SHERMAN, RH LOU, K PETITJEAN, C MARKUSHIN, VE TI MUON-CATALYZED PT FUSION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HYDROGEN AB Gamma rays and, for the first time, conversion muons of pt fusion have been measured from liquid mixtures of protium, deuterium, and tritium. The rate lambda10 for spin flip from the triplet to the singlet state of tmu(1s) was found to be lambda10 = (1.06 +/- 0.13) x 10(3) mus-1, the rate for muon-catalyzed pt fusion from the (I = 1) nuclear-spin state to be lambda(pt)f(I = 1) = 0.067 +/- 0.002(-0.002)+0.005 mus-1, and the molecular formation rate to be lambda(pt)m = (7.5 +/- 0.3(-0.3)+1.0) mus-1 (all rates normalized to liquid hydrogen density). C1 AUSTRIAN ACAD SCI,INST MITTELENERGIEPHYS,A-1090 VIENNA,AUSTRIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. RP BAUMANN, P (reprint author), TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. RI Jeitler, Manfred/H-3106-2012 NR 28 TC 5 Z9 5 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 14 PY 1993 VL 70 IS 24 BP 3720 EP 3723 DI 10.1103/PhysRevLett.70.3720 PG 4 WC Physics, Multidisciplinary SC Physics GA LF942 UT WOS:A1993LF94200012 ER PT J AU FONCK, RJ COSBY, G DURST, RD PAUL, SF BRETZ, N SCOTT, S SYNAKOWSKI, E TAYLOR, G AF FONCK, RJ COSBY, G DURST, RD PAUL, SF BRETZ, N SCOTT, S SYNAKOWSKI, E TAYLOR, G TI LONG-WAVELENGTH DENSITY TURBULENCE IN THE TFTR TOKAMAK SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANOMALOUS TRANSPORT; FLUCTUATIONS AB Long-wavelength (k(perpendicular-to)rho(i) < 1) density turbulence has been measured with good spatial localization in the core region of a high temperature tokamak plasma with auxiliary heating. Density fluctuations of n/n > 0.5% exist for k(perpendicular-to) < 2 cm-1 with radial and poloidal correlation lengths typically 1-2.5 cm in the confinement region, corresponding to k(perpendicular-to)rho(i) almost-equal-to 0.1-0.3. An anisotropic wave-number spectrum is observed, and estimates of the turbulence-driven transport are comparable to the anomalous transport observed in tokamaks. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP FONCK, RJ (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 21 TC 125 Z9 125 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 14 PY 1993 VL 70 IS 24 BP 3736 EP 3739 DI 10.1103/PhysRevLett.70.3736 PG 4 WC Physics, Multidisciplinary SC Physics GA LF942 UT WOS:A1993LF94200016 ER PT J AU YEH, JJ HWANG, J BERTNESS, K FRIEDMAN, DJ CAO, R LINDAU, I AF YEH, JJ HWANG, J BERTNESS, K FRIEDMAN, DJ CAO, R LINDAU, I TI GROWTH OF THE ROOM-TEMPERATURE AU/SI(111)-(7 X 7) INTERFACE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ION-SCATTERING; AU; SI(111); SILICON; SURFACE; SYSTEM; PHOTOEMISSION; ELECTRON AB Synchrotron radiation photoemission spectroscopy suggests that the room temperature grown Au/Si(111) interface is an abrupt interface with the contact made by metallic Au and bulk Si. Si 2p core level spectra show no sign of an interface component, but only the surface reacted and bulk Si components during the growth of the interface. A surface Au-Si alloy film is first formed for Au coverages below 3 monolayers. The alloy is then stabilized into an Au3Si-like film and detached from the Si substrate when metallic Au starts nucleation in between. C1 STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305. LUND UNIV,MAX LAB,S-22100 LUND,SWEDEN. SSRL,STANFORD,CA 94305. RP YEH, JJ (reprint author), AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. NR 23 TC 98 Z9 98 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 14 PY 1993 VL 70 IS 24 BP 3768 EP 3771 DI 10.1103/PhysRevLett.70.3768 PG 4 WC Physics, Multidisciplinary SC Physics GA LF942 UT WOS:A1993LF94200024 ER PT J AU SANDORFI, AM KHANDAKER, M AF SANDORFI, AM KHANDAKER, M TI THE P((GAMMA)OVER-RIGHT-ARROW, PI-0) REACTION IN THE DELTA(1232) REGION - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter ID PION-PHOTOPRODUCTION C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. RP SANDORFI, AM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 14 PY 1993 VL 70 IS 24 BP 3835 EP 3835 DI 10.1103/PhysRevLett.70.3835 PG 1 WC Physics, Multidisciplinary SC Physics GA LF942 UT WOS:A1993LF94200043 ER PT J AU HARA, S MCCALL, MR FORTE, TM AF HARA, S MCCALL, MR FORTE, TM TI REUPTAKE OF NASCENT LOW-DENSITY LIPOPROTEINS BY HEPG2 CELLS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE LDL; APO B-100; LDL RECEPTOR; HEPG2 ID BILE-ACID SYNTHESIS; APOLIPOPROTEIN-B; G2 CELLS; LINE HEP-G2; RECEPTOR ACTIVITY; SECRETION; DEGRADATION; CHOLESTEROL; PROTEINS; CULTURE AB The kinetics and specificity of the interaction of nascent HepG2 LDL with the HepG2 LDL receptor were examined. I-125-Labeled HepG2 LDL and plasma LDL were bound by HepG2 cells in a specific and saturable manner at 4-degrees-C. Competition studies with HepG2 LDL and plasma LDL indicated that both ligands bound to the same receptor. Scatchard analyses of the specific 4-degrees-C-binding data revealed a K(d) of 75 nM for HepG2 LDL and a K(d) of 30 nM for plasma LDL suggesting that HepG2 LDL bind less efficiently to the HepG2 LDL receptor than plasma LDL. Binding, internalization and degradation studies carried out at 37-degrees-C indicated that HepG2 cells are capable of catabolizing their own nascent LDL; however, under normal experimental conditions re-uptake of nascent LDL is quantitatively insignificant. C1 LAWRENCE BERKELEY LAB,DONNER LAB,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & NUCL MED,DIV LIFE SCI,BERKELEY,CA 94720. FU NCRR NIH HHS [RR 05918]; NHLBI NIH HHS [HL 18574, NRSA HL 07279] NR 37 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD JUN 12 PY 1993 VL 1168 IS 2 BP 199 EP 204 DI 10.1016/0005-2760(93)90125-S PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LH430 UT WOS:A1993LH43000010 PM 8504155 ER PT J AU MA, X KOURI, DJ HOFFMAN, DK AF MA, X KOURI, DJ HOFFMAN, DK TI MONTE-CARLO EVALUATION OF REAL-TIME FEYNMAN PATH-INTEGRALS USING DISTRIBUTED APPROXIMATING FUNCTIONS - MODIFIED-CAYLEY VERSUS SYMMETRICAL SPLIT-OPERATOR FORMALISM SO CHEMICAL PHYSICS LETTERS LA English DT Article ID WAVE PACKET DYNAMICS; QUANTUM DYNAMICS; SYSTEMS; PROPAGATOR; SCATTERING AB The results of calculations of the autocorrelation function for a Gaussian wavepacket propagating in a Morse potential are reported using a real time Monte Carlo path integration method based on distributed approximating functions. The symmetric split-operator and the modified-Cayley forms of the short-time full propagator are used in our calculations. It is found that the modified-Cayley form of the short-time propagator is better suited for real time Monte Carlo integration because the modified-Cayley integrand is less oscillatory than the symmetric split operator, requiring fewer sampling points to converge the Monte Carlo integration to a given accuracy. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP MA, X (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 36 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 11 PY 1993 VL 208 IS 3-4 BP 207 EP 213 DI 10.1016/0009-2614(93)89063-N PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LF716 UT WOS:A1993LF71600012 ER PT J AU DIACK, M COMPTON, RN GUIOCHON, G AF DIACK, M COMPTON, RN GUIOCHON, G TI EVALUATION OF STATIONARY PHASES FOR THE SEPARATION OF BUCKMINSTERFULLERENES BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID RETENTION; C60; C70; TEMPERATURE; OPTIMIZATION; FULLERENES; BEHAVIOR AB The high-performance liquid chromatographic separation of the buckminsterfullerenes C60 and C70 was studied using different chromatographic systems. Normal-phase (silica), non-aqueous reversed-phase (C18-bonded silica and graphitized carbon black) and charge-transfer complexation with dinitrobenzoylpherrylglycine (DNBPG) and 2-(2,4,5,7-tetranitro-9-fluorenylideneaminooxy)propionic acid (TAPA) were considered as retention mechanisms. Mobile phases of different compositions, but all based on hydrocarbons (toluene, hexane, heptane) as the main solvent, were used. Although it was found that the adsorption of the fullerenes on all the other phase systems is exothermic, their interactions with the charge-transfer phases exhibit an unusual endothermic behavior. The retention times of C60 and C70) on these phases increase with increasing temperature. The adsorption enthalpy and entropy derived from the Van 't Hoff plots confirm this rare temperature dependence. The adsorption enthalpy is positive whereas the adsorption entropy is strongly positive. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 33 TC 25 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUN 11 PY 1993 VL 639 IS 2 BP 129 EP 140 DI 10.1016/0021-9673(93)80247-6 PG 12 WC Chemistry, Analytical SC Chemistry GA LH263 UT WOS:A1993LH26300004 ER PT J AU OLSHANSKY, SJ CARNES, BA CASSEL, CK AF OLSHANSKY, SJ CARNES, BA CASSEL, CK TI FRUIT-FLY AGING AND MORTALITY SO SCIENCE LA English DT Letter C1 ARGONNE NATL LAB, DIV BIOL & MED RES, ARGONNE, IL 60439 USA. UNIV CHICAGO, DEPT MED, CHICAGO, IL 60637 USA. RP OLSHANSKY, SJ (reprint author), UNIV CHICAGO, CTR AGING HLTH & SOC, CHICAGO, IL 60637 USA. NR 4 TC 4 Z9 4 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD JUN 11 PY 1993 VL 260 IS 5114 BP 1565 EP 1567 DI 10.1126/science.8503000 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LG176 UT WOS:A1993LG17600003 PM 8503000 ER PT J AU KITSOPOULOS, TN BUNTINE, MA BALDWIN, DP ZARE, RN CHANDLER, DW AF KITSOPOULOS, TN BUNTINE, MA BALDWIN, DP ZARE, RN CHANDLER, DW TI REACTION-PRODUCT IMAGING - THE H+D2 REACTION SO SCIENCE LA English DT Article ID INTEGRAL CROSS-SECTIONS; POTENTIAL-ENERGY SURFACE; TUNABLE VUV RADIATION; KOHN VARIATIONAL PRINCIPLE; S-MATRIX VERSION; STATE DISTRIBUTIONS; COLLISION ENERGIES; TRAJECTORY CALCULATIONS; MULTIPHOTON IONIZATION; REACTION D+H2->HD+H AB The differential cross section for the H + D2 --> HD + D reaction has been measured using a technique called reaction product imaging. In this experiment, a photolytically produced beam of hydrogen (H) atoms crossed a beam of cold deuterium (D2) molecules. Product D atoms were ionized at the intersection of the two particle beams and accelerated toward a position-sensitive detector. The ion images appearing on the detector are two-dimensional projections of the three-dimensional velocity distribution of the D atom products. The reaction was studied at nominal center-of-mass collision energies of 0.54 and 1.29 electron volts. At the lower collision energy, the measured differential cross section for D atom production, summed over all final states of the HD(v,J) product, is in good agreement with recent quasi-classical trajectory calculations. At the higher collision energy, the agreement between the theoretical predictions and experimental results is less favorable. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. YALE UNIV,DEPT CHEM,NEW HAVEN,CT 06511. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. RI Zare, Richard/A-8410-2009; Kitsopoulos, Theofanis/A-8355-2014; Buntine, Mark/B-6878-2009 OI Buntine, Mark/0000-0003-0525-2795 NR 56 TC 118 Z9 119 U1 5 U2 22 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 11 PY 1993 VL 260 IS 5114 BP 1605 EP 1610 DI 10.1126/science.260.5114.1605 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LG176 UT WOS:A1993LG17600018 PM 17810201 ER PT J AU HILL, DP REASENBERG, PA MICHAEL, A ARABAZ, WJ BEROZA, G BRUMBAUGH, D BRUNE, JN CASTRO, R DAVIS, S DEPOLO, D ELLSWORTH, WL GOMBERG, J HARMSEN, S HOUSE, L JACKSON, SM JOHNSTON, MJS JONES, L KELLER, R MALONE, S MUNGUIA, L NAVA, S PECHMANN, JC SANFORD, A SIMPSON, RW SMITH, RB STARK, M STICKNEY, M VIDAL, A WALTER, S WONG, V ZOLLWEG, J AF HILL, DP REASENBERG, PA MICHAEL, A ARABAZ, WJ BEROZA, G BRUMBAUGH, D BRUNE, JN CASTRO, R DAVIS, S DEPOLO, D ELLSWORTH, WL GOMBERG, J HARMSEN, S HOUSE, L JACKSON, SM JOHNSTON, MJS JONES, L KELLER, R MALONE, S MUNGUIA, L NAVA, S PECHMANN, JC SANFORD, A SIMPSON, RW SMITH, RB STARK, M STICKNEY, M VIDAL, A WALTER, S WONG, V ZOLLWEG, J TI SEISMICITY REMOTELY TRIGGERED BY THE MAGNITUDE 7.3 LANDERS, CALIFORNIA, EARTHQUAKE SO SCIENCE LA English DT Article ID LONG VALLEY; SEQUENCE; PATTERNS; CALDERA AB The magnitude 7.3 Landers earthquake of 28 June 1992 triggered a remarkably sudden and widespread increase in earthquake activity across much of the western United States. The triggered earthquakes, which occurred at distances up to 1250 kilometers (17 source dimensions) from the Landers mainshock, were confined to areas of persistent seismicity and strike-slip to normal faulting. Many of the triggered areas also are sites of geothermal and recent volcanic activity. Static stress changes calculated for elastic models of the earthquake appear to be too small to have caused the triggering. The most promising explanations involve nonlinear interactions between large dynamic strains accompanying seismic waves from the mainshock and crustal fluids (perhaps including crustal magma). C1 UNIV UTAH, SALT LAKE CITY, UT 84112 USA. STANFORD UNIV, STANFORD, CA 94305 USA. NO ARIZONA UNIV, FLAGSTAFF, AZ 86011 USA. UNIV NEVADA, RENO, NV 89557 USA. CICESE, ENSENADA, MEXICO. UNIV TEXAS, AUSTIN, TX 78712 USA. US GEOL SURVEY, GOLDEN, CO USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. IDAHO NATL ENGN LAB, IDAHO FALLS, ID USA. US GEOL SURVEY, PASADENA, CA USA. UNIV TEXAS, EL PASO, TX 79968 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. NEW MEXICO INST MIN & TECHNOL, SOCORRO, NM 87801 USA. UNOCAL CORP, SANTA ROSA, CA USA. MONTANA BUR MINES & GEOL, BUTTE, MT 59701 USA. BOISE STATE UNIV, BOISE, ID 83725 USA. RP US GEOL SURVEY, MENLO PK, CA 94025 USA. RI Michael, Andrew/A-5059-2010 OI Michael, Andrew/0000-0002-2403-5019 NR 43 TC 495 Z9 528 U1 3 U2 49 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD JUN 11 PY 1993 VL 260 IS 5114 BP 1617 EP 1623 DI 10.1126/science.260.5114.1617 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LG176 UT WOS:A1993LG17600020 PM 17810202 ER PT J AU DRMANAC, R DRMANAC, S STREZOSKA, Z PAUNESKU, T LABAT, I ZEREMSKI, M SNODDY, J FUNKHOUSER, WK KOOP, B HOOD, L CRKVENJAKOV, R AF DRMANAC, R DRMANAC, S STREZOSKA, Z PAUNESKU, T LABAT, I ZEREMSKI, M SNODDY, J FUNKHOUSER, WK KOOP, B HOOD, L CRKVENJAKOV, R TI DNA-SEQUENCE DETERMINATION BY HYBRIDIZATION - A STRATEGY FOR EFFICIENT LARGE-SCALE SEQUENCING SO SCIENCE LA English DT Article AB The concept of sequencing by hybridization (SBH) makes use of an array of all possible n-nucleotide oligomers (n-mers) to identify n-mers present in an unknown DNA sequence. Computational approaches can then be used to assemble the complete sequence. As a validation of this concept, the sequences of three DNA fragments, 343 base pairs in length, were determined with octamer oligonucleotides. Possible applications of SBH include physical mapping (ordering) of overlapping DNA clones, sequence checking, DNA fingerprinting comparisons of normal and disease-causing genes, and the identification of DNA fragments with particular sequence motifs in complementary DNA and genomic libraries. The SBH techniques may accelerate the mapping and sequencing phases of the human genome project. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. CALTECH,DEPT BIOL,PASADENA,CA 91125. INST MOLEC GENET & GENET ENGN,YU-11000 BELGRADE,YUGOSLAVIA. RI Koop, Ben/A-8151-2008; Paunesku, Tatjana/A-3488-2017 OI Koop, Ben/0000-0003-0045-5200; Paunesku, Tatjana/0000-0001-8698-2938 NR 31 TC 159 Z9 165 U1 0 U2 6 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 11 PY 1993 VL 260 IS 5114 BP 1649 EP 1653 DI 10.1126/science.8503011 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LG176 UT WOS:A1993LG17600030 PM 8503011 ER PT J AU TAVANI, M LONDON, R AF TAVANI, M LONDON, R TI HYDRODYNAMICS OF WINDS FROM IRRADIATED COMPANION STARS IN LOW-MASS X-RAY BINARIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; HYDRODYNAMICS; STARS, MASS LOSS; X-RAYS, STARS ID ILLUMINATED STELLAR ATMOSPHERES; GALACTIC-CENTER; RADIATION; PERIOD; HERCULES-X-1; CYGNUS-X-3; ACCRETION; EVOLUTION; SPECTRA; SPECTROSCOPY AB We study the hydrodynamics of evaporative winds driven by X-rays and/or soft gamma-rays irradiating the outer layers of companion stars in low-mass X-ray binaries (LMXBs). We consider several irradiating fluxes and spectra for LMXBs with white dwarf and main-sequence companion stars. The thermal structure of the base of the coronal region, the position of the sonic point, and the value of the mass-loss rate are calculated in the case of spherical geometry. We consider photospheric and coronal heating from both X-ray photoionization and Compton scattering of X-rays and soft gamma-rays with energy approximately 1 MeV possibly irradiating the companion star in LMXBs. Evaporative winds may play a relevant role for the evolution of a special class of radiation-driven LMXBs, and this study is a step toward a quantitative understanding of the mechanism driving LMXB evolution. C1 PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP TAVANI, M (reprint author), PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 71 TC 35 Z9 35 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 10 PY 1993 VL 410 IS 1 BP 281 EP 294 DI 10.1086/172744 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LE330 UT WOS:A1993LE33000027 ER PT J AU SMITH, IA EPSTEIN, RI AF SMITH, IA EPSTEIN, RI TI RELATIVISTIC ELECTRON-POSITRON BEAMS IN GAMMA-RAY BURSTERS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; GAMMA-RAYS, BURSTS; RADIATION MECHANISMS, MISCELLANEOUS; STARS, MAGNETIC FIELDS; STARS, NEUTRON ID MAGNETIZED NEUTRON-STARS; MAGNETOSPHERIC PLASMA-OSCILLATIONS; TRANSIENT PARTICLE-ACCELERATION; PULSAR POLAR CAPS; COMPTON-SCATTERING; PAIR PRODUCTION; SPECTRA; EMISSION; ABSORPTION; FIELDS AB Beams of relativistic electrons and/or positrons leaving the surface of a strongly magnetized neutron star may give rise to gamma-ray bursts. The beams could be accelerated by strong, magnetically aligned electric fields that are produced by oscillations of the stellar surface. Here we investigate the particle acceleration in these electric fields, the resulting electron-positron pair cascade, and the gamma-ray emission. We find that beams of electrons and positrons moving parallel to the magnetic field are generated, with a differential energy distribution of approximately dN/depsilon(parallel-to) is-proportional-to epsilon(parallel-to)-2.1 for parallel energies epsilon(parallel-to) above a few tens of MeV. These beams produce the bulk of the gamma-ray burst radiation below approximately 1 MeV by the resonant Compton scattering of thermal photons emitted from the stellar surface. The escaping synchrotron radiation from the cascade dominates the radiation spectrum above approximately 1 MeV. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 61 TC 12 Z9 12 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 10 PY 1993 VL 410 IS 1 BP 315 EP 322 DI 10.1086/172748 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LE330 UT WOS:A1993LE33000031 ER PT J AU KAPLAN, T RASOLT, M KARIMI, M MOSTOLLER, M AF KAPLAN, T RASOLT, M KARIMI, M MOSTOLLER, M TI NUMERICAL-SIMULATION OF HE+ AND LI+ COLLISIONS WITH C60 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID METAL-SURFACES; CARBON; HELIUM AB Classical molecular dynamics have been used to simulate He+ and Li+ collisions with C60 in free space and on an iron substrate. We observe the implantation of He+ to form endohedral He+@C60 at various energies in the energy range 35-90 eV. Li+ collisions with C60 do not form Li+@C60. Instead we found insertion and fragmentation to form Li+@C54 and Li+@C56 in the energy range 115-200 eV. The yield of any particular collision depends strongly not only on the incident energy but also on the incident angle and the point of impact and has a weak dependence on whether or not the C60 is on the substrate or in free space. RP KAPLAN, T (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 23 TC 17 Z9 17 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 10 PY 1993 VL 97 IS 23 BP 6124 EP 6126 DI 10.1021/j100125a007 PG 3 WC Chemistry, Physical SC Chemistry GA LG415 UT WOS:A1993LG41500007 ER PT J AU DICK, JJ AF DICK, JJ TI ORIENTATION-DEPENDENT EXPLOSION SENSITIVITY OF SOLID NITROMETHANE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CRYSTALS AB A new model for explosive sensitivity has been applied to solid nitromethane. This model based on steric hindrance to shear flow gives a plausible explanation for the explosive behavior reported when nitromethane crystals of certain orientations were subjected to rapid loading in the diamond-anvil, high-pressure cell. RP DICK, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 9 TC 29 Z9 29 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 10 PY 1993 VL 97 IS 23 BP 6193 EP 6196 DI 10.1021/j100125a017 PG 4 WC Chemistry, Physical SC Chemistry GA LG415 UT WOS:A1993LG41500017 ER PT J AU ROULEAU, GA MEREL, P LUTCHMAN, M SANSON, M ZUCMAN, J MARINEAU, C HOANGXUAN, K DEMCZUK, S DESMAZE, C PLOUGASTEL, B PULST, SM LENOIR, G BIJLSMA, E FASHOLD, R DUMANSKI, J DEJONG, P PARRY, D ELDRIGE, R AURIAS, A DELATTRE, O THOMAS, G AF ROULEAU, GA MEREL, P LUTCHMAN, M SANSON, M ZUCMAN, J MARINEAU, C HOANGXUAN, K DEMCZUK, S DESMAZE, C PLOUGASTEL, B PULST, SM LENOIR, G BIJLSMA, E FASHOLD, R DUMANSKI, J DEJONG, P PARRY, D ELDRIGE, R AURIAS, A DELATTRE, O THOMAS, G TI ALTERATION IN A NEW GENE ENCODING A PUTATIVE MEMBRANE-ORGANIZING PROTEIN CAUSES NEUROFIBROMATOSIS TYPE-2 SO NATURE LA English DT Article ID BILATERAL ACOUSTIC NEUROFIBROMATOSIS; GRADIENT GEL-ELECTROPHORESIS; HUMAN-CHROMOSOME 22; SUBUNIT NF-H; POLYPOSIS-COLI; DNA FRAGMENTS; MENINGIOMA; TALIN; EZRIN; HOMOLOGY AB Neurofibromatosis type 2 (NF2) is a monogenic dominantly inherited disease predisposing carriers to develop nervous system tumours. To identify the genetic defect, the region between two flanking polymorphic markers on chromosome 22 was cloned and several genes identified. One is the site of germ-line mutations in NF2 patients and of somatic mutations in NF2-related tumours. Its deduced product has homology with proteins at the plasma membrane and cytoskeleton interface, a previously unknown site of action of tumour suppressor genes in humans. C1 MONTREAL GEN HOSP,RES INST,MONTREAL H3G 1A4,QUEBEC,CANADA. INST CURIE,GENET TUMEURS LAB,INSERM,CJF 9201,F-75231 PARIS 05,FRANCE. CEDARS SINAI MED CTR,NEUROGENET LAB,LOS ANGELES,CA 90048. INT AGCY RES CANC,F-69372 LYON,FRANCE. UNIV AMSTERDAM,INST HUMAN GENET,1105 AZ AMSTERDAM,NETHERLANDS. UNIV ERLANGEN NURNBERG,INST HUMAN GENET,W-8520 ERLANGEN,GERMANY. KAROLINSKA INST,DEPT CLIN GENET,S-10401 STOCKHOLM 60,SWEDEN. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. NCI,CLIN EPIDEMIOL BRANCH,BETHESDA,MD 20892. RP ROULEAU, GA (reprint author), MCGILL UNIV,CTR RECH NEUROSCI,MONTREAL H3A 2T5,QUEBEC,CANADA. OI zucman-rossi, Jessica/0000-0002-5687-0334 NR 43 TC 992 Z9 1009 U1 1 U2 36 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 10 PY 1993 VL 363 IS 6429 BP 515 EP 521 DI 10.1038/363515a0 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF939 UT WOS:A1993LF93900040 PM 8379998 ER PT J AU GRATZ, AJ NELLIS, WJ HINSEY, NA AF GRATZ, AJ NELLIS, WJ HINSEY, NA TI OBSERVATIONS OF HIGH-VELOCITY, WEAKLY SHOCKED EJECTA FROM EXPERIMENTAL IMPACTS SO NATURE LA English DT Article ID ANTARCTIC METEORITE; LUNAR ORIGIN; ALHA-81005; SPALLATION AB A SMALL proportion of meteorites found on Earth are thought to come from planet-sized bodies1,2. The 'lunar meteorites' are now well established as having come from the Moon3-6 on the basis of direct comparison with lunar samples. The SNC meteorites (shergottites, nakhlites and chassignites) - seven achondrite meteorites distinguished by extremely young formation ages (<1.3 Gyr), high volatile contents, distinctive oxygen isotopic ratios and rare earth compositions - are igneous rocks, believed2 to have formed on a planet, probably Mars. But it is hard to reconcile the weakly shocked nature of many lunar and SNC meteorites with the strong shock metamorphism known to accompany impacts of the size required to eject material from a planet-sized body. Computer modelling7-10 of impacts has yet to resolve this issue, although it has been proposed9,10 that surface rarefaction near an impact can produce high-velocity, weakly shocked ejecta. Here we present the results of a cratering experiment which separates and captures the ejecta from different regions around the impact site. We recover high-velocity, weakly shocked material as predicted9,10, lending additional support both to our understanding of cratering mechanics and to a planetary or lunar origin for the SNC and lunar meteorites. C1 LAWRENCE LIVERMORE NATL LAB,DIV H,LIVERMORE,CA 94550. RP GRATZ, AJ (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550, USA. NR 22 TC 25 Z9 25 U1 1 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUN 10 PY 1993 VL 363 IS 6429 BP 522 EP 524 DI 10.1038/363522a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF939 UT WOS:A1993LF93900041 ER PT J AU KAPLAN, DM APOLINSKI, M LUEBKE, W KWAN, SWL AF KAPLAN, DM APOLINSKI, M LUEBKE, W KWAN, SWL TI TEST OF PRINCIPLE OF AN OPTICAL TRIGGER FOR BEAUTY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have carried out a test of the principle of the Optical Trigger for Beauty proposed by Charpak, Glomataris, and Lederman. We measure the production and trapping by total internal reflection of Cherenkov light produced in a flat crystal of MgF2 by the passage of high-energy muons. Using an array of drift tubes to measure the trajectories of the muons, we observe a threshold in the production of trapped Cherenkov light as a function of muon incident angle. The shape of the threshold curve is consistent with that expected from a simple optical calculation. An angle-independent component of trapped Cherenkov light, apparently due to delta rays, is also observed. We discuss prospects for a practical device. C1 FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510. RP KAPLAN, DM (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 10 PY 1993 VL 330 IS 1-2 BP 33 EP 38 DI 10.1016/0168-9002(93)91301-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LD735 UT WOS:A1993LD73500005 ER PT J AU HERSHCOVITCH, AI KPONOU, AE AF HERSHCOVITCH, AI KPONOU, AE TI BACKSCATTERING OF ELECTRONS IN EBIS COLLECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID TARGETS AB Analysis of the effects of electron backscattering off an EBIS collector surface is presented. Results show that electron backscattering is a much more severe problem than secondary electrons. These electrons can accumulate in an EBIS collector and can eventually re-enter an EBIS. To our knowledge, this is the first time that electron backscattering problems in an EBIS have been considered. RP HERSHCOVITCH, AI (reprint author), ASSOC UNIV INC,BROOKHAVEN NATL LAB,DEPT AGS,UPTON,NY 11973, USA. NR 21 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 10 PY 1993 VL 330 IS 1-2 BP 144 EP 149 DI 10.1016/0168-9002(93)91316-F PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LD735 UT WOS:A1993LD73500020 ER PT J AU COSTALES, JB BRITT, HC NAMBOODIRI, MN SANGSTER, TC THOMAS, JH WEGNER, HE AF COSTALES, JB BRITT, HC NAMBOODIRI, MN SANGSTER, TC THOMAS, JH WEGNER, HE TI A PHOSWICH ARRAY FOR RELATIVISTIC HEAVY-ION COLLISIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SPECTROMETER; DETECTORS AB A phoswich array consisting of 42 DELTAE-E scintillator telescopes is described. The array was used for the measurement of charged pions, protons, deuterons and tritons produced near target rapidity in relativistic collisions of 14.6 A GeV/c Si-28 nuclei with targets ranging in mass from aluminum to gold. The present paper describes the array, its operation and performance, its response to protons, deuterons and tritons, and the means by which the detector has been calibrated. Intrinsic energy resolutions on the order of 2-3% have been obtained. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP COSTALES, JB (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. OI Thomas, James/0000-0002-6256-4536 NR 15 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 10 PY 1993 VL 330 IS 1-2 BP 183 EP 194 DI 10.1016/0168-9002(93)91321-D PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LD735 UT WOS:A1993LD73500025 ER PT J AU CHASE, RL DELATAILLE, C RESCIA, S SEGUIN, N AF CHASE, RL DELATAILLE, C RESCIA, S SEGUIN, N TI TRANSMISSION-LINE CONNECTIONS BETWEEN DETECTOR AND FRONT-END ELECTRONICS IN LIQUID ARGON CALORIMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB With the long electronic shaping times traditionally used for liquid argon calorimetry, a transmission line connecting the detector to the preamplifier will be responsible for an unacceptable noise increase. Here we show that this is not necessarily the case when the shaping times are of the order of, or less than, the transmission line delay, which is a condition imposed by high luminosity colliders (LHC, SSC). We also describe a non-integrating preamplifier which, while presenting a ''cold'' termination to the line, has a dynamic range compatible with the new high energy machines. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP CHASE, RL (reprint author), LAB ACCELERATEUR LINEAIRE,F-91405 ORSAY,FRANCE. RI Rescia, Sergio/D-8604-2011 OI Rescia, Sergio/0000-0003-2411-8903 NR 11 TC 21 Z9 21 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUN 10 PY 1993 VL 330 IS 1-2 BP 228 EP 242 DI 10.1016/0168-9002(93)91327-J PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LD735 UT WOS:A1993LD73500031 ER PT J AU GRANDY, JM MATTIS, MP AF GRANDY, JM MATTIS, MP TI VALLEY BIFURCATION IN AN O(3) SIGMA-MODEL - IMPLICATIONS FOR HIGH-ENERGY BARYON NUMBER VIOLATION SO PHYSICS LETTERS B LA English DT Article ID QUANTITATIVE THEORY; INSTANTON LIQUID; CROSS-SECTIONS; GAUGE-THEORIES; BREAKDOWN; SECTOR AB The valley method for computing the total high-energy anomalous cross section sigma(anom) is the extension of the optical theorem to the case of instanton-antiinstanton backgrounds. As a toy model for baryon number violation in Electroweak theory, we consider a version of the O(3) sigma model in which the conformal invariance is broken perturbatively. We show that at a critical energy the saddle-point values of the instanton size and instanton-antiinstanton separation bifurcate into complex conjugate pairs. This nonanalytic behavior signals the breakdown of the valley method at an energy where sigma(anom) is still exponentially suppressed. RP GRANDY, JM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET T-8,LOS ALAMOS,NM 87545, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 140 EP 146 DI 10.1016/0370-2693(93)90203-T PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600021 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B AUBERT, JJ BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B AUBERT, JJ BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G TI MEASUREMENT OF THE (B)OVER-BAR-0 AND B-MESON LIFETIMES SO PHYSICS LETTERS B LA English DT Article ID DECAYS AB The lifetimes of the B0BAR and B- mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of B0BAR and B- mesons were partially reconstructed by identifying events containing a lepton with an associated D*+ or D0 meson. The proper time of the B meson was estimated from the measured decay length and the momentum and mass of the D-lepton system. A fit to the proper time of 77 D*+l- and 77 D0l- candidates, combined with a constraint on the lifetime ratio (tau-/tau0) arising from the relative rates of observed D*+l- and D0l- events, yielded the following lifetimes: tau0 = 1.52(+0.20/-0.18) (stat. )+0.07/-0.13 (syst.) ps, tau = 1.47(+0.22/-0.19) (stat.)+0.15/-0.14 (syst.) ps, tau-/tau0 = 0.96(+0.19/-0.15) (stat. )+0.18/-0.12(syst.). C1 UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN. UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. INFN, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, CNRS, IN2P3, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. DEMOKRITOS NATL CTR SCI RES, ATHENS, GREECE. ECOLE POLYTECH, PHYS NUCL & HAUTES ENERGIES LAB, CNRS, IN2P3, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FLORENCE, DIPARTIMENTO FIS, INFN, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. INFN, LAB NAZL, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, IN2P3, CNRS, F-91405 ORSAY, FRANCE. INFN, DIPARTIMENTO FIS, I-56010 PISA, ITALY. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, IN2P3, CNRS, F-91405 ORSAY, FRANCE. INFN, DIPARTIMENTO FIS, I-56010 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND. RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND. CTR ETUD SACLAY, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE. UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. LINFN, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY. CNR, IST COSMO GEOFIS, TURIN, ITALY. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP BUSKULIC, D (reprint author), CNRS, IN2P3, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE. RI ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Gregorio, Anna/J-1632-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Assmann, Ralph/L-8457-2016; Ferrante, Isidoro/F-1017-2012 OI Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228 NR 30 TC 33 Z9 33 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 194 EP 208 DI 10.1016/0370-2693(93)90211-Y PG 15 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600029 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B AUBERT, JJ BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B AUBERT, JJ BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G TI MEASUREMENT OF THE STRONG-COUPLING CONSTANT USING TAU-DECAYS SO PHYSICS LETTERS B LA English DT Article ID QUANTUM-CHROMODYNAMIC CORRECTIONS; ELECTROWEAK RADIATIVE-CORRECTIONS; RESONANCE PHYSICS; E+E ANNIHILATION; PERTURBATIVE QCD; LEPTON; LEVEL; QUARK AB The strong coupling constant is determined from the leptonic branching ratios, the lifetime, and the invariant mass distribution of the hadronic final state of the tau lepton, using data accumulated at LEP with the ALEPH detector. The strong coupling constant measurement, alpha(s), (m(tau)2) = 0.330 +/-0.046, evolved to the Z mass, yields alpha(s)(M(Z)2) = 0. 1 18 +/- 0.005. The error includes experimental and theoretical uncertainties, the latter evaluated in the framework of the Shifman, Vainshtein and Zakharov (SVZ) approach. The method allows the non-perturbative contribution to the hadronic decay rate to be determined to be 0.3 +/- 0.5% . C1 UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BELLATER, SPAIN. UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. INFN, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, CNRS, IN2P3, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. DEMOKRITOS NATL CTR SCI RES, ATHENS, GREECE. ECOLE POLYTECH, PHYS NUCL & HAUTES ENERGIES LAB, CNRS, IN2P3, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FLORENCE, DIPARTIMENTO FIS, INFN, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. INFN, LAB NAZL, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, IN2P3, CNRS, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, IN2P3, CNRS, F-91405 ORSAY, FRANCE. INFN, DIPARTIMENTO FIS, I-56010 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW2 0EX, ENGLAND. RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND. CTR ETUD SACLAY, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE. UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. INFN, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY. CNR, IST COSMO GEOFIS, TURIN, ITALY. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND. RP BUSKULIC, D (reprint author), CNRS, IN2P3, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE. RI Delfino, Manuel/A-1545-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Gregorio, Anna/J-1632-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Ferrante, Isidoro/F-1017-2012; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Assmann, Ralph/L-8457-2016 OI Delfino, Manuel/0000-0002-9468-4751; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Ferrante, Isidoro/0000-0002-0083-7228; Miquel, Ramon/0000-0002-6610-4836; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; NR 49 TC 75 Z9 75 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 209 EP 220 DI 10.1016/0370-2693(93)90212-Z PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600030 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, O PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, O PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI DETERMINATION OF ALPHA(S) FOR B-QUARKS AT THE Z(0) RESONANCE SO PHYSICS LETTERS B LA English DT Article ID HEAVY FLAVOR PRODUCTION; JET PRODUCTION-RATES; E+ E ANNIHILATION; Z0 RESONANCE; FRAGMENTATION FUNCTIONS; CHARMED MESONS; STRING MODEL; MONTE-CARLO; Z DECAYS; QCD AB The strong coupling constant for b quarks has been determined, and its flavour independence, as predicted by QCD, investigated. The analysis involved events with lepton candidates selected from approximately 356 000 hadronic decays of the Z0, collected by the DELPHI detector at LEP in 1990 and 199 1. A method based on a direct comparison of the three-jet fraction in a b enriched sample, selected by requiring leptons with large momenta and transverse momenta, to that of the entire hadronic sample, illustrated the significant effect of the b quark mass on the multi-jet cross section, and verified the flavour independence of the strong coupling constant to an accuracy of +/- 6%. A second procedure based on a fit to the momentum and transverse momentum spectra of the lepton candidates in both two-jet and three (or more)-jet event samples simultaneously determined the b content in each, and, using second order QCD calculations, gave an absolute measurement of alpha(s) for b quarks of 0. 1 18 +/- 0.004 (stat.) +/- 0.003 (syst.) +/- 0.008 (scale). A comparison with a, for all quark flavours, as measured from the three-jet fraction in all hadronic events, further allowed the coupling strength for b quarks to be expressed in terms relative to that for udsc quarks, thereby cancelling certain common systematic uncertainties, and yielded alpha(s)b/alpha(s)udsc = 1.00 +/- 0.04 (stat.) +/- 0.03 (syst.). C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NATL CTR SCI RES DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,DIV HIGH ENERGY PHYS,INST PHYS,FZU,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,CNRS,IN2P3,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,LAB ACCELERATEUR LINEAIRE,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,CNRS,IN2P3,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. CHARLES UNIV,MFF,NC,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. NIKEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AVE ELIAS GARCIA 14-10,P-1000 LISBON,PORTUGAL. RI Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; de Groot, Nicolo/A-2675-2009; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014 OI Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Tome, Bernardo/0000-0002-7564-8392; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ruiz, Alberto/0000-0002-3639-0368; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; De Lotto, Barbara/0000-0003-3624-4480; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394 NR 75 TC 25 Z9 25 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 221 EP 236 DI 10.1016/0370-2693(93)90213-2 PG 16 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600031 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BACHMANN, S BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, HE ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BACHMANN, S BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, HE ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHAFER, C SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF GAMMA-B(B)OVER-BAR/GAMMA(HAD) FROM HADRONIC DECAYS OF THE Z SO PHYSICS LETTERS B LA English DT Article ID NEURAL NETWORKS; Z-RESONANCE; PHYSICS; JETS; TOP AB We report a measurement of R(b) = GAMMA(bbBAR)GAMMA(had) from Z --> qqBAR events at LEP. Z --> bbBAR events are identified using a multidimensional analysis based on a neural network approach. We obtain 60% sample purity with an efficiency of 35%. Our measured value of R(b) is 0.222 +/- 0.003 +/- 0.007. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 2, W-5100 AACHEN, GERMANY. NIKEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. CNRS, IN2P3, LAPP, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. IHEP, BEIJING 100039, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. MIT, CAMBRIDGE, MA 02139 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. USTC, HEFEI 230029, PEOPLES R CHINA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, CNRS, IN2P3, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. ITEP, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SIC, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PSI, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8092 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Gonzalez Romero, Enrique/L-7561-2014; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014 OI van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Gonzalez Romero, Enrique/0000-0003-2376-8920; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Cerrada, Marcos/0000-0003-0112-1691 NR 33 TC 37 Z9 37 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 237 EP 246 DI 10.1016/0370-2693(93)90214-3 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600032 ER PT J AU FRABETTI, PL GRIM, GP PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S SPALLONE, A ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R JAROSS, G LINGEL, K WISS, J CHEON, BG KANG, JS KIM, KY ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M DAVENPORT, F FILASETTA, JF BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD KENNEDY, CJ KIM, GN LIN, TF MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ZANABRIA, ME ARENA, V BOCA, G CASTOLDI, C DIAFERIA, R GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A WILSON, JR BLACKETT, GR PISHARODY, M HANDLER, T SHELDON, PD AF FRABETTI, PL GRIM, GP PAOLONE, VS YAGER, PM BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S SPALLONE, A ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R JAROSS, G LINGEL, K WISS, J CHEON, BG KANG, JS KIM, KY ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M DAVENPORT, F FILASETTA, JF BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD KENNEDY, CJ KIM, GN LIN, TF MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ZANABRIA, ME ARENA, V BOCA, G CASTOLDI, C DIAFERIA, R GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A WILSON, JR BLACKETT, GR PISHARODY, M HANDLER, T SHELDON, PD TI ANALYSIS OF THE DECAY MODE D+-](K)OVER-BAR-ASTERISK-0-MU+NU SO PHYSICS LETTERS B LA English DT Article AB Fermilab high-energy photoproduction experiment E687 provides a high statistics sample of the decay mode D+ --> K*0BARmu+nu (charge conjugates are implied). Our analysis yields a branching ratio of GAMMA(D+ --> K*0BARmu+nu)/GAMMA(D+ --> K-pi+pi+) = 0.56 +/- 0.04 +/- 0.06. The ratios of the form factors governing the decay are measured to be R(upsilon) = 1.74+/-0.27+/-0.28 and R2 = 0.78+/-0.18+/-0.10, implying a polarization of GAMMA(l)/GAMMA(t) = 1.20+/-0.13+/-0.13 for the electron decay. Finally, we report new limits on the decay modes D+ --> K-pi+mu+nu (nonresonant) and D+ --> K*0BARpi0mu+nu. C1 INFN, I-40126 BOLOGNA, ITALY. UNIV CALIF DAVIS, DAVIS, CA 95616 USA. UNIV COLORADO, BOULDER, CO 80309 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. INFN, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY. UNIV ILLINOIS, URBANA, IL 61801 USA. KOREA UNIV, SEOUL 136701, SOUTH KOREA. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. INFN, I-20133 MILAN, ITALY. UNIV N CAROLINA, ASHEVILLE, NC 28804 USA. NO KENTUCKY UNIV, HIGHLAND HTS, KY 41076 USA. NORTHWESTERN UNIV, EVANSTON, IL 60208 USA. UNIV NOTRE DAME, NOTRE DAME, IN 46556 USA. UNIV PAVIA, DIPARTIMENTO FIS NUCL, I-27100 PAVIA, ITALY. INFN, I-27100 PAVIA, ITALY. UNIV PUERTO RICO, MAYAGUEZ, PR 00708 USA. UNIV S CAROLINA, COLUMBIA, SC 29208 USA. UNIV TENNESSEE, KNOXVILLE, TN 37996 USA. VANDERBILT UNIV, NASHVILLE, TN 37235 USA. RP UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY. NR 6 TC 56 Z9 56 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 262 EP 268 DI 10.1016/0370-2693(93)90216-5 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600034 ER PT J AU ALBRECHT, R AWES, TC BAKTASH, C BECKMANN, P BERGER, F BLOOMER, MA BOCK, D BOCK, R CLAESSON, G CLEWING, G DRAGON, L EKLUND, A FERGUSON, R FRANZ, A GARPMAN, SIA GLASOW, R GUSTAFSSON, HA GUTBROD, HH HOLKER, G IDH, J JACOBS, P KAMPERT, KH KOLB, BW LOHNER, H LUND, I NYSTRAND, J OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, ML RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTOM, K SORENSEN, SP STEINHAEUSER, P STEFFENS, K STENLUND, E STUKEN, D YOUNG, GR AF ALBRECHT, R AWES, TC BAKTASH, C BECKMANN, P BERGER, F BLOOMER, MA BOCK, D BOCK, R CLAESSON, G CLEWING, G DRAGON, L EKLUND, A FERGUSON, R FRANZ, A GARPMAN, SIA GLASOW, R GUSTAFSSON, HA GUTBROD, HH HOLKER, G IDH, J JACOBS, P KAMPERT, KH KOLB, BW LOHNER, H LUND, I NYSTRAND, J OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, ML RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTOM, K SORENSEN, SP STEINHAEUSER, P STEFFENS, K STENLUND, E STUKEN, D YOUNG, GR TI EMISSION OF SLOW SINGLY CHARGED FRAGMENTS IN RELATIVISTIC O-16-NUCLEUS INTERACTIONS SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION INTERACTIONS; TARGET FRAGMENTATION; TRANSVERSE ENERGY; 200 GEV/NUCLEON; EMULSION; PROTONS; WA80 AB Multiplicity distributions of slow singly charged target fragments from O-16 induced reactions on C, Cu, Ag and Au are studied at 60 and 200 A GeV. The distributions from the two energies are essentially the same. Energy and angular distributions for slow protons are revealing the important role of cascading and rescattering in the spectator matter. The target dependence of the multiplicity of slow fragments exceeds A(T)2/3 for the heaviest targets. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV MUNSTER,INST KERNPHYS,W-4400 MUNSTER,GERMANY. LUND UNIV,DEPT PHYS,DIV COSM & SUBATOM PHYS,S-22362 LUND,SWEDEN. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV TENNESSEE,KNOXVILLE,TN 37996. UNIV GRONINGEN,KVI,9747 AA GRONINGEN,NETHERLANDS. RP ALBRECHT, R (reprint author), GSI DARMSTADT,PLANCKSTR 1,POSTFACH 110541,W-6100 DARMSTADT,GERMANY. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014; OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X; Kampert, Karl-Heinz/0000-0002-2805-0195 NR 16 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 10 PY 1993 VL 307 IS 1-2 BP 269 EP 272 DI 10.1016/0370-2693(93)90217-6 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LH166 UT WOS:A1993LH16600035 ER PT J AU SHI, X TANG, D HESKETT, D TSUEI, KD ISHIDA, H MORIKAWA, Y AF SHI, X TANG, D HESKETT, D TSUEI, KD ISHIDA, H MORIKAWA, Y TI COVERAGE-DEPENDENT CORE-LEVEL PHOTOEMISSION INVESTIGATIONS OF NA/CU(111) AND NA/NI(111) SO SURFACE SCIENCE LA English DT Article ID ALKALI-METAL ADSORPTION; ELECTRONIC-STRUCTURE; POTASSIUM; SURFACES; CS; PSEUDOPOTENTIALS; CHEMISORPTION; TRANSITION; OVERLAYERS; NA AB Coverage-dependent core level binding energies of Na adsorbed on both Cu(111) and Ni(111) surfaces have been measured by angle-integrated photoemission spectroscopy. For increasing Na coverage, the core level binding energies of the Na 2p and 2s levels decreased by 0.93 and 0.81 eV for Cu(111), and 1.1 and 0.95 eV for Ni(111), respectively, up to completion of the first monolayer. The qualitative behavior of the 2p and 2s level was similar for both systems. A local density functional (LDF) calculation of the electrostatic potential energy change as a function of alkali coverage allows us to separate out the contributions of initial and final state effects in the coverage dependence of these alkali core level binding energy shifts. Our results are more consistent with a covalent model of alkali-metal bonding. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN. RP UNIV RHODE ISL, DEPT PHYS, KINGSTON, RI 02881 USA. RI Morikawa, Yoshitada/B-8257-2012 NR 29 TC 19 Z9 19 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1993 VL 290 IS 1-2 BP 69 EP 79 DI 10.1016/0039-6028(93)90589-C PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LG187 UT WOS:A1993LG18700017 ER PT J AU YANG, LQ RAEKER, TJ DEPRISTO, AE AF YANG, LQ RAEKER, TJ DEPRISTO, AE TI SURFACE SEGREGATION IN BIMETALLIC CLUSTERS - PREDICTIONS USING A MOLECULAR-DYNAMICS MONTE-CARLO CORRECTED EFFECTIVE MEDIUM THEORY SO SURFACE SCIENCE LA English DT Article ID SIMULATIONS AB Computer simulations were performed to study the surface composition of RhxPd1-x, RhxNi1-x and NixPd1-x clusters where 0.1 less-than-or-equal-to x less-than-or-equal-to 0.9. Clusters containing 201 and 1289 atoms were simulated at 200, 600 and 1000 K. The simulation consists of the Monte Carlo (MC) exchange of the Positions of unlike atoms and the molecular-dynamics (MD) evolution of all atoms between exchanges. A corrected effective medium (CEM) theory based interatomic potential, with acronym MD/MC-CEM, was used to generate the forces. Our simulations indicate that the metal with lower surface energy segregates first to the catalytically very important edge-corner sites, then to other surface sites. Increasing the temperature decreases the degree of segregation at edge-corner sites more strongly than on the entire sur-face. Interestingly, Ni-Pd exhibits stronger surface segregation but weaker edge-corner segregation than Rh-Ni. Results for other 201- and 1289-atom 50%-50% bimetallic clusters at 600 K, selected from Rh, Ni, Pd, Cu and Ag, are also presented. In particular, the large lattice-size mismatch in Ni-Ag and Cu-Ag invalidates the simple geometrical constraints on surface segregation that hold for other bimetallic clusters. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP YANG, LQ (reprint author), IOWA STATE UNIV SCI & TECHNOL,USDOE,AMES LAB,AMES,IA 50011, USA. NR 19 TC 21 Z9 21 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1993 VL 290 IS 1-2 BP 195 EP 205 DI 10.1016/0039-6028(93)90601-F PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LG187 UT WOS:A1993LG18700029 ER PT J AU JENSEN, MB MYLER, U THIEL, PA AF JENSEN, MB MYLER, U THIEL, PA TI LOCAL AND COLLECTIVE STRUCTURE OF FORMATE ON PT(111) SO SURFACE SCIENCE LA English DT Letter ID ELECTRON-STIMULATED DESORPTION; FORMIC-ACID; SURFACE FORMATE; ENERGY LOSS; ADSORPTION; DECOMPOSITION; AL(111); ION; ORIENTATION; NI(110) AB Formic acid adsorption and reaction on Pt(111) has been studied using LEED and ESDIAD. After conversion of the molecular formic acid (HCOOH) to formate (HCOO) a (square-root 3 x square-root 3)R30-degrees LEED pattern is observed. This pattern is visible to 280 K, at which point the formate either recombines with H+ or decomposes. ESDIAD normal emission reaches a peak in intensity in the temperature region where the molecular plane of the formate is believed to be perpendicular to the surface plane. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP JENSEN, MB (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 27 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1993 VL 290 IS 1-2 BP L655 EP L661 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LG187 UT WOS:A1993LG18700003 ER PT J AU FUJITA, E CREUTZ, C SUTIN, N BRUNSCHWIG, BS AF FUJITA, E CREUTZ, C SUTIN, N BRUNSCHWIG, BS TI CARBON-DIOXIDE ACTIVATION BY COBALT MACROCYCLES - EVIDENCE OF HYDROGEN-BONDING BETWEEN BOUND CO2 AND THE MACROCYCLE IN SOLUTION SO INORGANIC CHEMISTRY LA English DT Article ID ELECTROCATALYTIC REDUCTION; COORDINATION CHEMISTRY; ABINITIO MO; COMPLEXES; BINDING; LIGANDS; THERMODYNAMICS; SPECTRA; SYSTEM; IRON AB The equilibrium between five-coordinate CoL(CO2)+ (L = 5,7,7,12,14,14-hexamethyl- 1,4,8,1 1 -tetraazacyclotetradeca-4,11-diene) and six-coordinate CoL(CO2)(CD3CN)+ (formed at the expense of the five-coordinate form as the temperature is lowered) was examined by both H-1 NMR and FT-IR. The equilibration is rapid on the NMR time scale, but the spectra of the limiting forms have been derived from the temperature dependence of the spectrum. The FT-IR spectra measured over the range 25 to -75-degrees-C in CD3CN and in a CD3CN/THF mixture indicate the existence of four CO2 adducts, two with intramolecular hydrogen bonds between the bound CO2 and the amine hydrogens of the ligand: a five-coordinate, non-hydrogen-bonded form (nu(C=O) = 1710 cm-1, nu(NH) = 3208 cm-1), a rive-coordinate intramolecularly hydrogen-bonded form (nu(C=O) = 1626 cm-1), a six-coordinate non-hydrogen-bonded form (nu(C=O) = 1609 cm-1, nu(NH) = 3224 cm-1), and a six-coordinate intramolecular hydrogen-bonded form (nu(C=O) = 1544 cm-1, nu(NH) = 3145 cm-1). The binding of CO2 via both its electrophilic center (carbon atom) and its nucleophilic center (oxygen atom) is thus implicated in the stabilization of the CO2 complex at low temperature. RP FUJITA, E (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Brunschwig, Bruce/G-4249-2011; Fujita, Etsuko/D-8814-2013 NR 31 TC 57 Z9 57 U1 3 U2 32 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 9 PY 1993 VL 32 IS 12 BP 2657 EP 2662 DI 10.1021/ic00064a015 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LG549 UT WOS:A1993LG54900016 ER PT J AU LIN, XW PIOTROWSKA, A KAMINSKA, E LILIENTALWEBER, Z WASHBURN, J WEBER, E AF LIN, XW PIOTROWSKA, A KAMINSKA, E LILIENTALWEBER, Z WASHBURN, J WEBER, E TI EFFECTS OF AL2O3 CAP ON THE STRUCTURAL AND ELECTRICAL-PROPERTIES OF AU/TE/AU CONTACTS ON AN N-TYPE GAAS SUBSTRATE SO APPLIED PHYSICS LETTERS LA English DT Article ID OHMIC CONTACTS AB Au/Te/Au contacts to n-type GaAs were prepared by sequential vapor deposition and subsequently annealed at temperatures in the range 420-480-degrees-C. The structural and electrical characteristics of the contacts were characterized by transmission electron microscopy and current-voltage measurements. We found that the electrical behavior of the contacts depends dramatically on whether they are covered with an Al2O3 cap during annealing. While a cap-annealed Au/Te/Au contact remains rectifying, annealing without the cap results in ohmic behavior. In conjunction with the observed structural properties, this phenomenon can be understood in terms of the doping model for ohmic contact formation. C1 INST ELECTR MAT TECHNOL,PL-02668 WARSAW,POLAND. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP LIN, XW (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012; Kaminska, Eliana/C-3086-2013 NR 9 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 7 PY 1993 VL 62 IS 23 BP 2995 EP 2997 DI 10.1063/1.109168 PG 3 WC Physics, Applied SC Physics GA LE985 UT WOS:A1993LE98500033 ER PT J AU TKACZYK, JE DELUCA, JA KARAS, PL BEDNARCZYK, PJ CHRISTEN, DK KLABUNDE, CE KERCHNER, HR AF TKACZYK, JE DELUCA, JA KARAS, PL BEDNARCZYK, PJ CHRISTEN, DK KLABUNDE, CE KERCHNER, HR TI ENHANCED TRANSPORT CRITICAL-CURRENT AT HIGH FIELDS AFTER HEAVY-ION IRRADIATION OF TEXTURED TLBA2CA2CU3OZ THICK-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; THERMAL-NEUTRON IRRADIATION; CU-O CRYSTALS; FLUX CREEP; IRREVERSIBILITY LINE; MAGNETIC-FIELD; YBA2CU3O7; BEHAVIOR AB Spray pyrolyzed T1 ( 1 223) films deposited on polycrystalline YSZ substrates are characterized before and after heavy ion irradiation, A factor of 2 decrease in zero field critical current is observed. However, significantly improved critical current is found at fields above 1 T, where intragranular effects dominate. The irreversibility line at 5 T is shifted by approximately 20 K to higher temperatures. Scaling of the data before and after irradiation and at different temperatures is modeled by an expression which interpolates between single vortex pinning and collective creep. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP TKACZYK, JE (reprint author), GE CO,CORP RES & DEV,SCHENECTADY,NY 12301, USA. NR 37 TC 26 Z9 26 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 7 PY 1993 VL 62 IS 23 BP 3031 EP 3033 DI 10.1063/1.109150 PG 3 WC Physics, Applied SC Physics GA LE985 UT WOS:A1993LE98500045 ER PT J AU ELLIOTT, S ROWLAND, FS AF ELLIOTT, S ROWLAND, FS TI NUCLEOPHILIC-SUBSTITUTION RATES AND SOLUBILITIES FOR METHYL HALIDES IN SEAWATER SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID STRATOSPHERIC OZONE; ORGANIC-COMPOUNDS; BROMINE; HYDROCARBONS; HYDROLYSIS; ATMOSPHERE; WATER AB Ozone depletion potentials indicate that methyl bromide is among halogen containing gases which may be scheduled for international level regulation. The oceanic component of its global budget is currently unquantifiable because of a lack of surface seawater measurements. Given values for internal removal and for solubility, marine mixed layer modelling can set bounds for air-sea transfer. Rate constants have been measured in seawater, 0.5m NaCl and distilled water for attack on methyl bromide by the chief oceanic nucleophiles chloride ion and H2O, over much of the oceanographic temperature range (0-degrees-C to 22-degrees-C). Henry's Law constants have been determined for the same conditions. All results are consistent with classical aqueous phase research adjusted for ionic strength effects. The lifetime of methyl bromide with respect to chemical decay in seawater is three weeks at average surface temperatures, and a factor of ten larger and smaller at the extremes. Its dimensionless solubility ranges from 0.1 to 0.3. Analogous experiments are reported for the other natural methyl halides, CH3Cl and CH3I. C1 UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92715. RP ELLIOTT, S (reprint author), LOS ALAMOS NATL LAB,INST GEOPHYS & PLANETARY PHYS,LOS ALAMOS,NM 87545, USA. NR 44 TC 88 Z9 89 U1 0 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUN 7 PY 1993 VL 20 IS 11 BP 1043 EP 1046 DI 10.1029/93GL01081 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LJ516 UT WOS:A1993LJ51600011 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI DYNAMICS OF PARAMAGNETIC CHROMIUM-ALLOYS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID AT-PERCENT-V; TEMPERATURE-DEPENDENCE; SCATTERING AB Despite the absence of a static spin-density wave (SDW), the cross section of paramagnetic chromium alloys still peaks near the wavevectors of the SDW in pure chromium. An analysis of the paramagnetic fluctuations in doped chromium reveals that the cross section vanishes at zero temperature and zero frequency, in agreement with recent experiments by Fawcett et al. We also predict that the peak elastic cross section will reach a maximum at a temperature which increases with the impurity concentration and that impurity scattering will eventually broaden the sidepeaks into a single central peak. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 18 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUN 7 PY 1993 VL 5 IS 23 BP 3959 EP 3964 DI 10.1088/0953-8984/5/23/022 PG 6 WC Physics, Condensed Matter SC Physics GA LG297 UT WOS:A1993LG29700022 ER PT J AU JAISWAL, DK ANDRES, H MORIMOTO, H WILLIAMS, PG AF JAISWAL, DK ANDRES, H MORIMOTO, H WILLIAMS, PG TI SYNTHESIS AND NMR CHARACTERIZATION OF TRI-N-BUTYLTIN TRITIDE SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID CONSTANTS; HYDRIDE AB Tri-n-butyltin tritide, a potentially versatile tritiation reagent, is synthesized at maximum specific radioactivity and characterized by H-1, H-3 and Sn-119 NMR techniques. C1 LAWRENCE BERKELEY LAB,NATL TRITIUM LAB FACIL,75-123,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. SANDOZ PHARMA LTD,CHEM RES & DEV,CH-4002 BASEL,SWITZERLAND. NR 23 TC 15 Z9 15 U1 1 U2 1 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD JUN 7 PY 1993 IS 11 BP 907 EP 909 DI 10.1039/c39930000907 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA LG166 UT WOS:A1993LG16600011 ER PT J AU SCHLUETER, JA SEAMAN, JM TAHA, S COHEN, H LYKKE, KR WANG, HH WILLIAMS, JM AF SCHLUETER, JA SEAMAN, JM TAHA, S COHEN, H LYKKE, KR WANG, HH WILLIAMS, JM TI SYNTHESIS, PURIFICATION, AND CHARACTERIZATION OF THE 1/1 ADDITION PRODUCT OF C-60 AND ANTHRACENE SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID CARBON; C-60; SUPERCONDUCTIVITY; SPECTRA; C70 AB A cleanly separated Diels-Alder product of C60, a 1 : 1 adduct of anthracene, has been synthesized and characterized by thermogravimetric analysis, and NMR, UV-VIS, IR and mass spectroscopies. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 21 TC 108 Z9 108 U1 5 U2 10 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD JUN 7 PY 1993 IS 11 BP 972 EP 974 DI 10.1039/c39930000972 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA LG166 UT WOS:A1993LG16600048 ER PT J AU LAHIRI, A AF LAHIRI, A TI THE NO-HAIR THEOREM FOR THE ABELIAN HIGGS-MODEL SO MODERN PHYSICS LETTERS A LA English DT Article AB We consider the general procedure for proving no-hair theorems for static, spherically symmetric black holes. We apply this method to the Abelian Higgs model and find a proof of the no-hair conjecture that circumvents the objections raised against the original proof due to Adler and Pearson. RP LAHIRI, A (reprint author), LOS ALAMOS NATL LAB,DIV THEORET T-8,LOS ALAMOS,NM 87545, USA. RI Lahiri, Amitabha/C-8114-2011 OI Lahiri, Amitabha/0000-0001-8113-6345 NR 0 TC 10 Z9 10 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD JUN 7 PY 1993 VL 8 IS 17 BP 1549 EP 1556 DI 10.1142/S0217732393001288 PG 8 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA LM518 UT WOS:A1993LM51800001 ER PT J AU AHMAD, S BONNER, BE BUCHANAN, JA CHAN, CS CLEMENT, JM EISEMAN, SE EMPL, A ETKIN, A FOLEY, KJ HACKENBURG, RW HALLMAN, TJ KRAMER, MA KRUK, J LINDENBAUM, SJ LONGACRE, RS LOVE, WA MADANSKY, L MORRIS, W MUTCHLER, GS PEASLEE, DC PLATNER, ED SAULYS, AC TOSHKOV, S AF AHMAD, S BONNER, BE BUCHANAN, JA CHAN, CS CLEMENT, JM EISEMAN, SE EMPL, A ETKIN, A FOLEY, KJ HACKENBURG, RW HALLMAN, TJ KRAMER, MA KRUK, J LINDENBAUM, SJ LONGACRE, RS LOVE, WA MADANSKY, L MORRIS, W MUTCHLER, GS PEASLEE, DC PLATNER, ED SAULYS, AC TOSHKOV, S TI ANTIPROTON-NUCLEUS INTERACTIONS AT 5 TO 9 GEV/C SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID STRANGE-PARTICLE-PRODUCTION; QUARK-GLUON PLASMA; 4 GEV/C; PBARP INTERACTIONS; 4.5 GEV/C; ANNIHILATION; DISTRIBUTIONS; ENERGIES; SYSTEM; REST AB Antiproton beams of 5, 7 and 9 GeV/c were used to interact with C, Al, Cu, Sn and Pb nuclear targets. Charged particle multiplicity distributions, strange particle production cross sections and rapidity distributions were measured. The charged particle multiplicities are reported in this paper. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CUNY CITY COLL,NEW YORK,NY 10031. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV MARYLAND,COLL PK,MD 20742. RP AHMAD, S (reprint author), RICE UNIV,TW BONNER NUCL LAB,HOUSTON,TX 77251, USA. NR 31 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C393 EP C404 PG 12 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500033 ER PT J AU ARMSTRONG, T BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, C GOLLWITZER, K HAHN, A HASAN, MA HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, A MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, M WERKEMA, S ZHANG, Y ZHAO, JL ZIOULAS, G AF ARMSTRONG, T BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, C GOLLWITZER, K HAHN, A HASAN, MA HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, A MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, M WERKEMA, S ZHANG, Y ZHAO, JL ZIOULAS, G TI LIGHT-QUARK SPECTROSCOPY AT THE FERMILAB ANTIPROTON ACCUMULATOR SO NUCLEAR PHYSICS A LA English DT Article ID ANNIHILATIONS; CALORIMETER; PROTON AB Fermilab experiment E-760 has confirmed the f2(1520) state in the 3pi0 final state in antiproton-proton annihilations in-flight (approximately 3.0 to 3.6 GeV c.m. energy), seen previously by Crystal Barrel and other groups at CERN at rest. The f2(1520) is also seen in its 2pi0 decay mode in the 2pi0eta channel and 2eta decay mode in the pi(0)2eta channel. There are indications of this state in the 3eta decay channel. The invariant mass spectrum is rich in states near 2 GeV, and amplitude and spin/parity analysis of the Dalitz plot is in progress in this mass region. C1 INFN, I-44100 FERRARA, ITALY. INFN, I-10125 TURIN, ITALY. INFN, I-16146 GENOA, ITALY. PENN STATE UNIV, YORK, PA 17403 USA. UNIV FERRARA, I-44100 FERRARA, ITALY. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV TURIN, I-10125 TURIN, ITALY. UNIV CALIF IRVINE, IRVINE, CA 92717 USA. NORTHWESTERN UNIV, EVANSTON, IL 60201 USA. RP ARMSTRONG, T (reprint author), PENN STATE UNIV, UNIV PK, PA 16802 USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Mussa, Roberto/0000-0002-0294-9071; Sozzi, Marco/0000-0002-2923-1465; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C53 EP C62 DI 10.1016/0375-9474(93)90382-8 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500007 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALLAVICINI, M PALESTINI, S PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI CHARMONIUM FORMATION IN P(P)OVER-BAR ANNIHILATION BY EXPERIMENT-E760 SO NUCLEAR PHYSICS A LA English DT Article ID STATES AB Experiment E760, at the FNAL pBAR Accumulator,is dedicated to the study of charmonium formation in ppBAR annihilation. New measurements of the total width and mass of narrow (ccBAR) states and of the partial width of the chi2 state to gammagamma are presented. The first evidence for the h(c)(1P1) singlet state is discussed in detail. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. INFN, I-44100 FERRARA, ITALY. INFN, I-16146 GENOA, ITALY. NORTHWESTERN UNIV, EVANSTON, IL 60208 USA. INFN, I-10125 TURIN, ITALY. UNIV TURIN, I-10125 TURIN, ITALY. RP ARMSTRONG, TA (reprint author), PENN STATE UNIV, UNIV PK, PA 16802 USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C259 EP C268 DI 10.1016/0375-9474(93)90398-H PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500023 ER PT J AU AUGUSTIN, I AMSLER, C BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AUGUSTIN, I AMSLER, C BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI NEW STATES AS OBSERVED BY THE CRYSTAL BARREL EXPERIMENT SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID RESONANCE; PROTON; MESON; ETA AB The Crystal Barrel Detector has been in operation since October 1989. Results on the analysis of the annihilation of protonium at rest into three pseudoscalars is presented. The pi0pi0pi0 final state confirms the existence of f2(1520)-->pi0pi0. In the etaeta system of the pi0etaeta final state an isoscalar J(PC) = 0++ resonance with a mass of 1560 MeV/c2 and a width of 245 MeV/c2 is observed. The identification with f0(1590) is doubtful since the etaeta' decay is not observed with the corresponding strength. Our analysis yields an upper limit for the relative branching ratio BR(f0(1560)-->etaeta')/BR(fo(1560)-->etaeta) < 0.24. C1 UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,W-6500 MAINZ,GERMANY. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RP AUGUSTIN, I (reprint author), UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. NR 14 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C3 EP C12 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500003 ER PT J AU BARNES, PD BREUNLICH, WH EISENSTEIN, RA EYRICH, W FISCHER, H FRANKLIN, G FRANZ, J GEYER, R HAMANN, N HERTZOG, D JOHANSSON, T KILIAN, K KIRSCH, M KRAFT, R OELERT, W OHLSSON, S QUINN, B ROHRICH, K ROSSLE, E ROZON, M SCHMITT, H SCHUMACHER, R SEFZICK, T STINZING, F TAYLOE, R TODENHAGEN, R URBAN, HJ WIRTH, H ZEPS V ZIOLKOWSKI, M AF BARNES, PD BREUNLICH, WH EISENSTEIN, RA EYRICH, W FISCHER, H FRANKLIN, G FRANZ, J GEYER, R HAMANN, N HERTZOG, D JOHANSSON, T KILIAN, K KIRSCH, M KRAFT, R OELERT, W OHLSSON, S QUINN, B ROHRICH, K ROSSLE, E ROZON, M SCHMITT, H SCHUMACHER, R SEFZICK, T STINZING, F TAYLOE, R TODENHAGEN, R URBAN, HJ WIRTH, H ZEPS, V ZIOLKOWSKI, M TI FROM (P)OVER-BAR-P-]LAMBDA-OVER-BAR-LAMBDA TO (P)OVER-BAR-P-SIGMA-OVER-BAR+/-SIGMA+/- WITH PS185 AT LEAR SO NUCLEAR PHYSICS A LA English DT Article ID REACTION PBARP->LAMBDA-BAR-LAMBDA; REACTION PBARP->LAMBDABARLAMBDA; 1.695 GEV/C; THRESHOLD; EXCHANGE AB The main focus of the PS185 collaboration at LEAR is the study of exclusive antihyperonhyperon production in antiproton-proton collisions. This has been done comprehensively for the reaction ppBAR-->LAMBDALAMBDABAR. In recent years other channels like ppBAR-->LAMBDASIGMA0 + cc. or ppBAR-->SIGMA+/-SIGMA+/-BAR have been included in the program. Results from the ongoing analysis for these final states will be presented. C1 CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND. UNIV ERLANGEN NURNBERG, W-8520 ERLANGEN, GERMANY. UNIV FREIBURG, W-7800 FREIBURG, GERMANY. UNIV ILLINOIS, URBANA, IL 61801 USA. FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH 1, GERMANY. UNIV UPPSALA, S-75105 UPPSALA, SWEDEN. OAW, INST MITTELENERGIEPHYS, VIENNA, AUSTRIA. RP BARNES, PD (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. RI Eyrich, Wolfgang /E-1730-2013; Schumacher, Reinhard/K-6455-2013 OI Schumacher, Reinhard/0000-0002-3860-1827 NR 27 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C277 EP C286 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500025 ER PT J AU BRAUNE, K AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF BRAUNE, K AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI FINAL-STATES WITH STRANGENESS FROM CRYSTAL BARREL AND ASTERIX SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID PHI-PRODUCTION; SPECTROMETER; ANNIHILATION; LEAR AB We discuss phi production in ppBAR annihilation at rest from the Asterix and Crystal Barrel experiments and compare the branching ratios to similar final states without strangeness. The omegapi0/phipi0 production ratio is unexpectedly low. In the search for new states, the phipi0 mass spectrum shows no evidence for a resonance in the 1450 MeV/c2 mass range but the K*K0pi0 Dalitz plot shows interesting structure. C1 CERN,CH-1211 GENEVA,SWITZERLAND. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,W-6500 MAINZ,GERMANY. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RP BRAUNE, K (reprint author), UNIV MUNICH,SEKT PHYS,W-8000 MUNICH 40,GERMANY. NR 7 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C269 EP C276 PG 8 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500024 ER PT J AU DOVER, CB AF DOVER, CB TI LEAP-92 - CONFERENCE SUMMARY SO NUCLEAR PHYSICS A LA English DT Editorial Material ID PROTON-ANTIPROTON ANNIHILATION; ELECTROMAGNETIC FORM-FACTOR; TIME-LIKE REGION; PBARP ANNIHILATION; 4 GEV/C; PBARP->LAMBDA-BAR-LAMBDA REACTION; PONTECORVO REACTIONS; NBARN ANNIHILATION; 4-QUARK EXOTICS; ANALYZING POWER AB We present a summary of the many new results in antiproton (pBAR) physics presented at the LEAP '92 conference, in the areas of meson spectroscopy, NNBAR scattering, annihilation and spin observables, strangeness and charm production, NBAR annihilation in nuclei, atomic physics with very low energy p'sBAR, the exploration of fundamental symmetries and interactions with p'sBAR (CP, T, CPT, gravitation), and the prospects for new pBAR facilities at ultra-low energies or energies above the LEAR regime (greater-than-or-equal-to 2 GeV/c). RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 83 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C721 EP C750 PG 30 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500058 ER PT J AU GUTSCHE, T DOVER, CB FAESSLER, A AF GUTSCHE, T DOVER, CB FAESSLER, A TI PRODUCTION OF Q(Q)OVER-BAR-G HYBRID MESONS IN N(N)OVER-BAR-N ANNIHILATION SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID PAIR-CREATION MODEL; QQBARG HYBRID; QUARK-MODEL; PHYSICS; STATES; DECAYS AB Nucleon-antinucleon (NNBAR) annihilation reactions provide a copious source for the production of gluons (g) through the destruction of quark-antiquark (QQBAR) pairs in the initial state. Therefore, in addition to the production of the usual QQBAR meson states, NNBAR annihilation can serve as an entrance channel to mesonic resonances containing dynamical excitations of the gluon field g, for instance hybrids (QQgBAR). We discuss the main features of the spectrum and decay modes for these hybrid mesons. Particularly, we focus on the production mechanism in NNBAR annihilation, thereby employing a microscopic model with constituent quarks and gluons. Branching ratios for hybrid production are found to be strongly dependent on the quantum numbers and kinematical factors associated with the transition. We specifically emphasize the dependence on the relative orbital angular momentum L of the NNBAR system, explorable at NNBAR annihilation at rest (L=0,1). Favorable cases for the production and decay modes of hybrid mesons, accessible for measurements by Crystal Barrel at LEAR, are discussed. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP GUTSCHE, T (reprint author), UNIV TUBINGEN,INST THEORET PHYS,MORGENSTELLE 14,W-7400 TUBINGEN 1,GERMANY. NR 30 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C63 EP C72 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500008 ER PT J AU HOLZSCHEITER, MH BROWN, RE CAMP, JB CORNFORD, S DARLING, T DYER, P GOLDMAN, T HOIBRATEN, S HOSEA, K HUGHES, RJ JARMIE, N KENEFICK, RA KING, NSP LIZON, DC NIETO, MM MIDZOR, MM PARRY, SP ROCHET, J RISTINEN, RA SCHAUER, MM SCHECKER, JA WITTEBORN, FC AF HOLZSCHEITER, MH BROWN, RE CAMP, JB CORNFORD, S DARLING, T DYER, P GOLDMAN, T HOIBRATEN, S HOSEA, K HUGHES, RJ JARMIE, N KENEFICK, RA KING, NSP LIZON, DC NIETO, MM MIDZOR, MM PARRY, SP ROCHET, J RISTINEN, RA SCHAUER, MM SCHECKER, JA WITTEBORN, FC TI TRAPPING OF ANTIPROTONS IN A LARGE PENNING TRAP - PROGRESS TOWARDS A MEASUREMENT OF THE GRAVITATIONAL ACCELERATION OF THE ANTIPROTON SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ AB A measurement of the acceleration of antiprotons in the Earth's gravitational field was proposed to C.E.R.N. in 1986 and was accepted as experiment PS200 for operation at LEAR. In preparation for this experiment up to 50,000 antiprotons have been captured into a large Penning trap and stored for several minutes. This paper describes the experimental technique used and possible improvements in the total number of particles captured and the storage time achieved. We also discuss the current status of the development of the gravity experiment. C1 TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV COLORADO,BOULDER,CO 80309. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. RP HOLZSCHEITER, MH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 5 TC 21 Z9 21 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C709 EP C718 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500057 ER PT J AU HSUEH, SY AF HSUEH, SY TI LOW-ENERGY (P)OVER-BAR PHYSICS AT FNAL SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID CP AB The charmonium formation experiment is the only low energy pBAR experiment at FNAL. This paper describes the performance of the Fermilab pBAR Accumulator during fixed target run for the experiment and the planned upgrades. We also discuss the proposal for the direct CP violation search in pBAR + p --> LAMBDA + LAMBDA --> ppi+BAR + ppi-. RP HSUEH, SY (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C561 EP C568 PG 8 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500045 ER PT J AU HUGHES, RJ AF HUGHES, RJ TI FUNDAMENTAL SYMMETRY-TESTS WITH ANTIHYDROGEN SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID MUONIUM 1S-2S TRANSITION; EQUIVALENCE PRINCIPLE; LASER SPECTROSCOPY; RYDBERG CONSTANT; QUANTUM-GRAVITY; ANTI-GRAVITY; MASS; ANTIMATTER; POSITRONS; ANTIPROTONS AB The prospects for testing CPT invariance and the weak equivalence principle (WEP) for antimatter with spectroscopic measurements on antihydrogen are discussed. The potential precisions of these tests are compared with those from other measurements. The arguments involving energy conservation, the behaviour of neutral kaons in a gravitational field and the equivalence principle for antiparticles are reviewed in detail. RP HUGHES, RJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,P-15,LOS ALAMOS,NM 87545, USA. NR 93 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C605 EP C624 PG 20 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500048 ER PT J AU LAZARUS, DM AF LAZARUS, DM TI ANTIPROTON PHYSICS AT BNL SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID BRANCHING RATIO; DECAY; SEARCH; GEV/C; LIMITS; PI AB A review of antiproton physics at the Brookhaven AGS in past decade is given as well as a description of the present high energy physics program. Existing and potential facilities for antiproton physics at the AGS are discussed and are found to provide useful antiproton intensities over the momentum range proposed for SUPERLEAR in a multiple user environment. RP LAZARUS, DM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C547 EP C560 PG 14 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500044 ER PT J AU NOBLE, AJ AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF NOBLE, AJ AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI ANTIPROTON-PROTON ANNIHILATION AT REST INTO 2 MESONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 2ND BIENNIAL CONF ON LOW-ENERGY ANTIPROTON PHYSICS ( LEAP 92 ) CY SEP 14-19, 1992 CL COURMAYEUR, ITALY SP IST NAZL FIS NUCL, REG AUTONOMA VALLE AOSTA, ASSESSORATO PUBBLICA ISTRUZ ID QUARK-LINE RULE; PBARP ANNIHILATION; P-STATES; ETA; RESONANCE; HYDROGEN; PI+PI; PHI AB Branching ratios for antiproton-proton annihilations at rest into two mesons are given. The data were obtained at LEAR by stopping antiprotons in a liquid hydrogen target. Both charged and neutral annihilation products were detected in the Crystal Barrel detector. Representative data are presented, and their bearing on the general picture of annihilation dynamics is discussed. In addition, preliminary branching ratios for two-body radiative annihilations are given. C1 CERN,CH-1211 GENEVA,SWITZERLAND. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF BERKELEY,LBL,BERKELEY,CA 94720. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,W-6500 MAINZ,GERMANY. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RP NOBLE, AJ (reprint author), UNIV ZURICH,INST PHYS CHEM,CH-8001 ZURICH,SWITZERLAND. NR 28 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUN 7 PY 1993 VL 558 BP C127 EP C136 PG 10 WC Physics, Nuclear SC Physics GA LR285 UT WOS:A1993LR28500012 ER PT J AU EBERHARD, PH AF EBERHARD, PH TI TESTING THE NONLOCALITY OF QUANTUM-THEORY IN 2-KAON SYSTEMS SO NUCLEAR PHYSICS B LA English DT Article ID HIDDEN-VARIABLE THEORIES; BELLS THEOREM; INEQUALITIES AB An idea for testing the non-local character of quantum theory in systems made of two neutral kaons is suggested. Such tests require detecting two long-lived or two short-lived neutral kaons in coincidence, when copper slabs are either interposed on or removed from their paths. They may be performed at an asymmetric PHI0-factory. They could answer some questions raised by the EPR paradox and Bell's inequalities. If such tests are performed and if predictions of quantum mechanics and standard theory of kaon regeneration are verified experimentally, all descriptions of the relevant phenomena in terms of local interactions will be ruled out in principle with the exception of very peculiar ones, which imply the existence of hidden variables, of different kinds of kaons corresponding to different values of the hidden variables, and, for some of these kaons, of regeneration probabilities enhanced by a factor of the order of 400 or more over the average. Of course, the experiment may also reveal a break down of quantum theory. RP EBERHARD, PH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 29 TC 37 Z9 38 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUN 7 PY 1993 VL 398 IS 1 BP 155 EP 183 DI 10.1016/0550-3213(93)90631-X PG 29 WC Physics, Particles & Fields SC Physics GA LF701 UT WOS:A1993LF70100006 ER PT J AU BOWMAN, DR PEASLEE, GF CARLIN, N DESOUZA, RT GELBKE, CK GONG, WG KIM, YD LISA, MA LYNCH, WG PHAIR, L TSANG, MB WILLIAMS, C COLONNA, N HANOLD, K MCMAHAN, MA WOZNIAK, GJ MORETTO, LG AF BOWMAN, DR PEASLEE, GF CARLIN, N DESOUZA, RT GELBKE, CK GONG, WG KIM, YD LISA, MA LYNCH, WG PHAIR, L TSANG, MB WILLIAMS, C COLONNA, N HANOLD, K MCMAHAN, MA WOZNIAK, GJ MORETTO, LG TI SOURCES AND EMISSION TIME SCALES IN E/A = 50-MEV XE-129 PLUS (NAT)CU REACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIFRAGMENT EMISSION; NUCLEAR FRAGMENTATION; STATISTICAL MULTIFRAGMENTATION; COLLISIONS; AR-36+AU-197; MODEL; DECAY AB Velocity distributions and fragment-fragment correlation functions have been measured as a function of charged particle multiplicity for Xe-129 + (nat)Cu Collisions at E/A = 50 MeV. With increasing multiplicity, the velocity distributions evolve from a pattern exhibiting targetlike and projectilelike sources to an anisotropic distribution centered near the projectile-target center-of-mass velocity. Emission times extracted from the correlation functions are consistent with the decay of a projectilelike source in low multiplicity collisions, but the time scale for fragment emission in the high multiplicity collisions is too short for a separation of sources to occur. C1 MICHIGAN STATE UNIV,NATL SUPERCOND CYCLOTRON LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV FUS RES,BERKELEY,CA 94720. RI Carlin Filho, Nelson/C-2187-2012; Lynch, William/I-1447-2013; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; deSouza, Romualdo/0000-0001-5835-677X NR 33 TC 80 Z9 80 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 7 PY 1993 VL 70 IS 23 BP 3534 EP 3537 DI 10.1103/PhysRevLett.70.3534 PG 4 WC Physics, Multidisciplinary SC Physics GA LE942 UT WOS:A1993LE94200003 ER PT J AU VAGER, Z GRABER, T KANTER, EP ZAJFMAN, D AF VAGER, Z GRABER, T KANTER, EP ZAJFMAN, D TI DIRECT OBSERVATION OF NUCLEAR REARRANGEMENT IN MOLECULES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DYNAMICS; SPECTROSCOPY; COLLISIONS; DOUBLET AB The first direct experimental observation of an intramolecular reaction path going through a transition state is reported. The results of a Coulomb explosion imaging experiment for cold CH4+ molecular ions show the intermediate conformations between permutationally equivalent structures of this molecule. Comparison with a theoretical prediction of the corresponding reaction path is given and the agreement is satisfactory. C1 WEIZMANN INST SCI, DEPT NUCL PHYS, IL-76100 REHOVOT, ISRAEL. UNIV ILLINOIS, DEPT PHYS, CHICAGO, IL 60680 USA. RP ARGONNE NATL LAB, DIV PHYS, ARGONNE, IL 60439 USA. NR 28 TC 15 Z9 16 U1 1 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 7 PY 1993 VL 70 IS 23 BP 3549 EP 3552 DI 10.1103/PhysRevLett.70.3549 PG 4 WC Physics, Multidisciplinary SC Physics GA LE942 UT WOS:A1993LE94200007 ER PT J AU HILL, JP FENG, Q BIRGENEAU, RJ THURSTON, TR AF HILL, JP FENG, Q BIRGENEAU, RJ THURSTON, TR TI LOSS OF LONG-RANGE ORDER IN THE 3D RANDOM-FIELD ISING-MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSITIONS AB We report a synchrotron magnetic x-ray scattering study of the temperature evolution of the magnetic long range order (LRO) of Mn0.75Zn0.25F2 in a magnetic field with emphasis on the behavior after zero field cooling (ZFC). We show that with increasing temperature the metastable ZFC LRO vanishes continuously at a temperature well above the equilibrium T(N); the LRO follows a rounded power law with exponent beta(ZFC) = 0.20 +/- 0.02 and a transition width which scales as approximately H-2 but with no divergent critical fluctuations. We argue that this behavior is generic to the random field Ising model. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP HILL, JP (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Hill, John/F-6549-2011 NR 16 TC 23 Z9 23 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 7 PY 1993 VL 70 IS 23 BP 3655 EP 3658 DI 10.1103/PhysRevLett.70.3655 PG 4 WC Physics, Multidisciplinary SC Physics GA LE942 UT WOS:A1993LE94200034 ER PT J AU CHU, YT AF CHU, YT TI DETERMINATION OF THE OPTICAL DIELECTRIC FUNCTIONS OF THIN ABSORBING FILMS FROM IR REFLECTIVITY MEASUREMENTS SO THIN SOLID FILMS LA English DT Article AB A method of determining the optical dielectric function of an absorbing thin film overlayed on an absorbing thick substrate by a classical oscillator fit to its experimental IR reflectivity spectra is reported. This simple method overcomes the difficulty that occurs in identifying those modes of the film with large damping. Using this method the optical dielectric function of a gamma-Al2O3 thin film overlayed on a single-crystal alpha-Al2O3 substrate is determined. RP OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD JUN 5 PY 1993 VL 229 IS 1 BP 119 EP 121 DI 10.1016/0040-6090(93)90418-O PG 3 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LJ797 UT WOS:A1993LJ79700022 ER PT J AU FRIEMAN, JA GRADWOHL, BA AF FRIEMAN, JA GRADWOHL, BA TI DARK MATTER AND THE EQUIVALENCE PRINCIPLE SO SCIENCE LA English DT Editorial Material C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP FRIEMAN, JA (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 10 TC 7 Z9 7 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 4 PY 1993 VL 260 IS 5113 BP 1441 EP 1442 DI 10.1126/science.260.5113.1441 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF058 UT WOS:A1993LF05800022 PM 17739799 ER PT J AU VEBLEN, DR BANFIELD, JF GUTHRIE, GD HEANEY, PJ ILTON, ES LIVI, KJT SMELIK, EA AF VEBLEN, DR BANFIELD, JF GUTHRIE, GD HEANEY, PJ ILTON, ES LIVI, KJT SMELIK, EA TI HIGH-RESOLUTION AND ANALYTICAL TRANSMISSION ELECTRON-MICROSCOPY OF MINERAL DISORDER AND REACTIONS SO SCIENCE LA English DT Article ID NON-STOICHIOMETRIC OXIDES; PHASE-TRANSITION; PRECIPITATION PHENOMENA; INCOMMENSURATE PHASE; EXSOLUTION LAMELLAE; REDUCED RUTILES; QUARTZ; INCLUSIONS; SILICATES; TEMPERATURE AB Crystal defects and chemical reactions occurring at scales beyond the resolution of light microscopes have major effects on the chemical and physical properties of rocks and minerals. High-resolution imaging, diffraction, and chemical analysis in the transmission electron microscope have become important methods for exploring mineral defect structures and reaction mechanisms and for studying the distribution of phases resulting from reactions. These techniques have shown that structural disorder is common in some rock-forming minerals but rare in others. They have also established mechanisms by which many reactions occur at the atomic cluster scale. These data thus provide an atomistic basis for understanding the kinetics of geological reactions. Furthermore, apparent major-element, minor-element, and trace-element chemistry of minerals can be influenced by submicroscopic inclusions or intergrowths, which commonly form as products of solid-state reactions. C1 UNIV WISCONSIN,DEPT GEOL & GEOPHYS,MADISON,WI 53706. LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. PRINCETON UNIV,DEPT GEOL & GEOPHYS SCI,PRINCETON,NJ 08544. LEHIGH UNIV,DEPT GEOL & ENVIRONM SCI,BETHLEHEM,PA 18015. RP VEBLEN, DR (reprint author), JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218, USA. NR 89 TC 9 Z9 9 U1 2 U2 8 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 4 PY 1993 VL 260 IS 5113 BP 1465 EP 1472 DI 10.1126/science.260.5113.1465 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF058 UT WOS:A1993LF05800028 PM 17739802 ER PT J AU RODRIQUEZ, JA GOODMAN, DW AF RODRIQUEZ, JA GOODMAN, DW TI METAL-METAL BONDS IN BIMETALLIC SURFACES - RESPONSE SO SCIENCE LA English DT Article ID LAYERS; ADSORPTION; SHIFTS; CO C1 TEXAS A&M UNIV SYST,DEPT CHEM,COLL STN,TX 77843. RP RODRIQUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 16 TC 8 Z9 8 U1 1 U2 10 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 4 PY 1993 VL 260 IS 5113 BP 1527 EP 1528 DI 10.1126/science.260.5113.1527-a PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LF058 UT WOS:A1993LF05800045 PM 17739807 ER PT J AU KEENEYWALKER, J BASS, BR AF KEENEYWALKER, J BASS, BR TI APPLICATIONS OF ADINA TO EVALUATE ANALYSIS METHODOLOGIES FOR PREDICTING CLEAVAGE ARREST AND REINITIATION OF A DEEP CRACK IN AN RPV SO COMPUTERS & STRUCTURES LA English DT Article; Proceedings Paper CT 9TH ADINA ( AUTOMATIC DYNAMIC INCREMENTAL NONLINEAR ANALYSIS ) CONF : NONLINEAR FINITE ELEMENT ANALYSIS AND ADINA CY JUN 23-25, 1993 CL MIT, CAMBRIDGE, MA HO MIT AB Several calculational procedures are compared for predicting cleavage arrest of a deep crack in the wall of a prototypical reactor pressure vessel (RPV) subjected to pressurized-thermal-shock (PTS) types of loading conditions. The three procedures examined in this study used the following models: (1) a static finite-element model (full bending); (2) a radially constrained static model; and (3) a thermoelastic dynamic finite-element model. A PTS transient loading condition was selected that produced a deep arrest of an axially oriented, initially shallow crack according to calculational results obtained from the static (full-bending) model. Results from the two static models were compared with those generated from the detailed thermoelastic dynamic finite-element analysis using ADINA. The dynamic analyses modeled cleavage-crack propagation using a node-release technique and application-mode methodologies. Comparisons presented here indicate that the degree to which dynamic solutions can be approximated by static models is highly dependent on several factors, including the material dynamic fracture curves and the propensity for cleavage reinitiation of the arrested crack under PTS loading conditions. Additional work is required to develop and validate a satisfactory dynamic fracture toughness model applicable to postcleavage arrest conditions in an RPV. RP KEENEYWALKER, J (reprint author), OAK RIDGE NATL LAB,MARTIN MARIETTA ENERGY SYST,OAK RIDGE,TN 37831, USA. NR 25 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD JUN 3 PY 1993 VL 47 IS 4-5 BP 553 EP 564 DI 10.1016/0045-7949(93)90342-B PG 12 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA LJ459 UT WOS:A1993LJ45900006 ER PT J AU ZHANG, D NORRIS, JR KRUSIC, PJ WASSERMAN, E CHEN, CC LIEBER, CM AF ZHANG, D NORRIS, JR KRUSIC, PJ WASSERMAN, E CHEN, CC LIEBER, CM TI TIME-RESOLVED EPR AND FOURIER-TRANSFORM EPR STUDY OF TRIPLET C-60 - DETERMINATIONS OF T1 AND THE C-13 HYPERFINE COUPLING-CONSTANT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-SPIN-RESONANCE; TRANSIENT ABSORPTION; ESR SPECTROSCOPY; STATE; FULLERENES; SPECTRA; C70 AB Continuous wave (CW) and time-resolved (TR) EPR spectra of triplet C60 with partial and full C-13 enrichment in methylcyclohexane solutions after UV irradiation were obtained. Line broadening from C-13 satellites was observed. The C-13 hyperfine coupling constant was determined to be 0.06 G. Fourier transform EPR (FT-EPR) experiments with a resolution of 20 ns were carried out, and T1 was found to be 0.8 +/- 0.1 mus by fitting the intensity of the free induction decay signal to the modified Bloch equations. The relaxation time from FT-EPR is in excellent agreement with estimations from the line width of CW-EPR. Because the C-13 hyperfine coupling constant is so small, no distinct satellite lines were observed with C-13 in natural abundance at 200 K. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. DUPONT CO INC,CENT RES & DEV,WILMINGTON,DE 19880. HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138. RI Chen, Chia-Chun/F-7939-2012 NR 29 TC 31 Z9 31 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 3 PY 1993 VL 97 IS 22 BP 5886 EP 5889 DI 10.1021/j100124a018 PG 4 WC Chemistry, Physical SC Chemistry GA LE951 UT WOS:A1993LE95100018 ER PT J AU NEUBERT, M AF NEUBERT, M TI REPARAMETRIZATION INVARIANCE AND THE EXPANSION OF CURRENTS IN THE HEAVY-QUARK EFFECTIVE THEORY SO PHYSICS LETTERS B LA English DT Article ID EFFECTIVE FIELD-THEORY; MESON FORM-FACTORS; STATIC QUARK; RENORMALIZATION; LIGHT AB The coefficients appearing at leading and subleading order in the 1/m expansion of bilinear heavy quark currents are related to each other by imposing reparametrization invariance on both the effective current operators and the short-distance coefficient functions in the heavy quark effective theory. When combined with present knowledge about the leading order coefficients, the results allow to calculate all coefficients appearing at order 1/m to next-to-leading order in renormalization-group improved perturbation theory. They also provide a meaningful definition of the velocity transfer variable v . v' at order 1/m. RP NEUBERT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 22 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 3 PY 1993 VL 306 IS 3-4 BP 357 EP 362 DI 10.1016/0370-2693(93)90091-U PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE901 UT WOS:A1993LE90100025 ER PT J AU BRANCO, GC PARADA, PA MOROZUMI, T REBELO, MN AF BRANCO, GC PARADA, PA MOROZUMI, T REBELO, MN TI EFFECT OF FLAVOR-CHANGING NEUTRAL CURRENTS IN THE LEPTONIC ASYMMETRY IN BD DECAYS SO PHYSICS LETTERS B LA English DT Article ID CP-VIOLATION; QUARKS AB We evaluate the charge asymmetry in equal sign dileptons arising from the decay of a B(d)0-B(d)0BAR pair, in the presence of Z-mediated flavor-changing neutral currents. We compare our predictions with those of the standard model and the superweak model. C1 INST SUPER TECN,P-1699 LISBON,PORTUGAL. UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A7,ONTARIO,CANADA. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP BRANCO, GC (reprint author), INIC,CFMC,AV PROF GAMA PINTO 2,P-1699 LISBON,PORTUGAL. OI Branco, Gustavo C./0000-0001-5974-7043 NR 21 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUN 3 PY 1993 VL 306 IS 3-4 BP 398 EP 402 DI 10.1016/0370-2693(93)90098-3 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE901 UT WOS:A1993LE90100032 ER PT J AU FRYDMAN, L LEE, YK EMSLEY, L CHINGAS, GC PINES, A AF FRYDMAN, L LEE, YK EMSLEY, L CHINGAS, GC PINES, A TI VARIABLE-ANGLE 3-DIMENSIONAL EXCHANGE NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY FOR THE STUDY OF MOLECULAR-MOTION IN COMPLEX SOLIDS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID NMR; JUMPS AB Although molecular motions are responsible for many of the macroscopic properties observed in solids, especially in polymers, methods for studying these processes in all but the simplest systems are scarce. In the present study we introduce a three-dimensional nuclear magnetic resonance experiment for characterizing ultraslow molecular motions in complex solid systems. The technique extracts dynamic information by resolving the two-dimensional exchange distributions that can be observed in spectra of static samples, according to the isotropic chemical shifts of individual molecular sites. These three-dimensional correlations are achieved by processing signals arising from a fast-spinning solid sample using two independent macroscopic axes of rotation as extraction parameters, an approach which becomes practical due to the simple scaling behavior of anisotropic chemical shifts with respect to the axis of sample rotation. The principles involved in this new spectroscopic technique are discussed, and the method is illustrated with an application to the analysis of motions in isotactic polypropylene. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Emsley, Lyndon/C-6108-2008 OI Emsley, Lyndon/0000-0003-1360-2572 NR 23 TC 16 Z9 16 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 2 PY 1993 VL 115 IS 11 BP 4825 EP 4829 DI 10.1021/ja00064a050 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA LF062 UT WOS:A1993LF06200050 ER PT J AU SIZEK, HW GRAY, GT AF SIZEK, HW GRAY, GT TI DEFORMATION OF POLYCRYSTALLINE NI3AL AT HIGH-STRAIN RATES AND ELEVATED-TEMPERATURES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID SINGLE-CRYSTALS; FLOW-STRESS; MECHANICAL-PROPERTIES; RATE DEPENDENCE; YIELD STRESS; BEHAVIOR; BORON; ORIENTATION; ALLOYS; SLIP AB The mechanical response of Ni3Al to deformation at high temperatures has long been known to exhibit a flow stress/temperature anomaly. The variations in the yield and flow stress/temperature in Ni3Al have been widely studied at quasi-static strain rates, epsilon < 1 s-1. In this study polycrystalline Ni3Al with 0.095 at.% boron was deformed over a wide range of strain rates (0.001-8000 s-1) and temperatures (77-1273 K). Dynamic strain rate tests were conducted over the entire temperature range using a split Hopkinson bar. At 300 K the yield stress remains constant with increasing strain rate. The anomalous yield behavior is observed at epsilon = 3000 s-1. The yield stress was found to be strain rate sensitive at temperatures > 823 K. In all cases the work hardening exhibited a rate sensitivity, increasing with increasing strain rate and decreasing with increasing temperature. In Ni3Al deformed at all rates and at temperatures below 473 K the microstructure observed with TEM was mostly {111}[110] dislocations with coarse planar slip bands forming at the highest strain rates. As the temperature increased more {100}[110] dislocations were observed but the overall density of the dislocations decreased. C1 LOS ALAMOS NATL LAB, MST 5, LOS ALAMOS, NM 87545 USA. NR 37 TC 24 Z9 24 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1993 VL 41 IS 6 BP 1855 EP 1860 DI 10.1016/0956-7151(93)90205-7 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD467 UT WOS:A1993LD46700023 ER PT J AU BOLMARO, RE GUERRA, FM KOCKS, UF BROWNING, RV DAWSON, PR EMBURY, JD POOLE, WJ AF BOLMARO, RE GUERRA, FM KOCKS, UF BROWNING, RV DAWSON, PR EMBURY, JD POOLE, WJ TI ON PLASTIC STRAIN DISTRIBUTION AND TEXTURE DEVELOPMENT IN FIBER COMPOSITES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID METAL-MATRIX COMPOSITES; DEFORMATION AB A model situation-plane-strain deformation of a composite with many infinitely long. regularly arranged, undeformable fibers perpendicular to the plane of straining-has been analyzed by finite-element simulation of an isotropic continuum and subsequent polycrystal simulation of texture development for the strain and rotation paths of some characteristic material points. The principal effect of the inclusions is a change in flow pattern in the areas far away from them; by comparison, ''dead-zone'' or ''cluster'' effects in the immediate vicinity of the inclusions are quite small in extent. The changed flow pattern in about half the matrix material consists of shears and rotations that change both with progressing deformation and with location. This causes significant alterations in texture development, which tend toward contributing a uniform background to the average matrix texture. However, other areas of the matrix do contribute definite texture components. The relevance of these conclusions to other geometries and loading paths is discussed. RP BOLMARO, RE (reprint author), LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RI Bolmaro, Raul/H-6520-2016; Kocks, Fred/E-1159-2011 OI Bolmaro, Raul/0000-0002-8218-6958; NR 35 TC 18 Z9 18 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1993 VL 41 IS 6 BP 1893 EP 1905 DI 10.1016/0956-7151(93)90209-B PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LD467 UT WOS:A1993LD46700027 ER PT J AU PHILLIPS, JL BAME, SJ GOSLING, JT MCCOMAS, DJ GOLDSTEIN, BE BALOGH, A AF PHILLIPS, JL BAME, SJ GOSLING, JT MCCOMAS, DJ GOLDSTEIN, BE BALOGH, A TI SOLAR-WIND THERMAL ELECTRONS FROM 1.15-AU TO 5.34-AU - ULYSSES OBSERVATIONS SO ADVANCES IN SPACE RESEARCH LA English DT Article AB Using unique 3-d velocity space measurements by the Ulysses solar wind plasma experiment from 1. 15 to 5.34 AU, we assess the radial gradient in thermal electron temperature. Until 3.8 AU, the gradient was steeper than previously reported but flatter than adiabatic; after 3.8 AU the gradient flattened. Trends in the observed electron distribution shapes qualitatively support predictions for regulation by Coulomb collisions and by expansion in a spiral IMF. C1 JET PROP LAB,PASADENA,CA 91109. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP PHILLIPS, JL (reprint author), LOS ALAMOS NATL LAB,MS-D438,LOS ALAMOS,NM 87545, USA. NR 7 TC 14 Z9 14 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JUN PY 1993 VL 13 IS 6 BP 47 EP 50 DI 10.1016/0273-1177(93)90389-S PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LF448 UT WOS:A1993LF44800006 ER PT J AU MARSDEN, RG SANDERSON, TR WENZEL, KP BAME, SJ AF MARSDEN, RG SANDERSON, TR WENZEL, KP BAME, SJ TI COSPIN LET OBSERVATIONS OF RECURRENT ENERGETIC PARTICLE EVENTS DURING THE IN-ECLIPTIC PHASE OF THE ULYSSES MISSION SO ADVANCES IN SPACE RESEARCH LA English DT Article ID INTERACTION REGIONS AB The Ulysses spacecraft, launched in October 1990, traversed the in-ecliptic region of the heliosphere from 1 to 5 AU during the post-maximum phase of solar cycle 22 prior to its encounter with Jupiter in February 1992. In the period from launch up to mid-1991, particle events were dominated by the effects of large-scale transient structures in the solar wind. Thereafter, a more regular pattern of recurrent events related to Corotating Interaction Regions (CIR) evolved. We present an overview of these CIR-related events as recorded by the Low Energy Telescope (LET), part of the COSPIN experiment on board Ulysses, in the energy range approximately 1 to 20 MeV/n, with particular emphasis on the composition of the particle populations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MARSDEN, RG (reprint author), ESTEC,ESA,DEPT SPACE SCI,POB 299,2200 AG NOORDWIJK,NETHERLANDS. NR 11 TC 15 Z9 15 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JUN PY 1993 VL 13 IS 6 BP 95 EP 98 DI 10.1016/0273-1177(93)90396-S PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LF448 UT WOS:A1993LF44800013 ER PT J AU KOVSCEK, AR WONG, H RADKE, CJ AF KOVSCEK, AR WONG, H RADKE, CJ TI A PORE-LEVEL SCENARIO FOR THE DEVELOPMENT OF MIXED WETTABILITY IN OIL-RESERVOIRS SO AICHE JOURNAL LA English DT Article ID WETTING FILMS AB Understanding the role of thin films in porous media is vital to elucidate wettability at the pore level. The type and thickness of films coating pore walls determine reservoir wettability and whether or not reservoir rock can be altered from its initial state of wettability. Pore shape, especially pore wall curvature, is important in determining wetting-film thicknesses. Yet, pore shape and physics of thin wetting films are generally neglected in flow models in porous rocks. Thin-film forces incorporated into a collection of star-shaped capillary tubes model describe the geological development of mixed wettability in reservoir rock. Here, mixed wettability refers to continuous and distinct oil and water-wetting surfaces coexisting in the porous medium. This model emphasizes the remarkable role of thin films. New pore-level fluid configurations arise that are quite unexpected. For example, efficient water displacement of oil (low residual oil saturation) characteristic of mixed-wettability porous media is ascribed to interconnected oil lenses or rivulets which bridge the walls adjacent to pore corners. Predicted residual oil saturations are approximately 35% less in mixed-wet rock than in completely water-wet rock. Calculated capillary pressure curves mimic those of mixed-wet porous media in the primary drainage of water, imbibition of water, and secondary drainage modes. A mott-Harvey indices range from -0.18 to 0.36 also in good agreement with experimental values (Morrow et al., 1986; Jadhunandan and Morrow, 1991). C1 LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RI Wong, Harris/F-6097-2013 OI Wong, Harris/0000-0001-9402-6778 NR 50 TC 195 Z9 198 U1 4 U2 23 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD JUN PY 1993 VL 39 IS 6 BP 1072 EP 1085 DI 10.1002/aic.690390616 PG 14 WC Engineering, Chemical SC Engineering GA LF909 UT WOS:A1993LF90900015 ER PT J AU ALEXANDER, ML HEMBERGER, PH CISPER, ME NOGAR, NS AF ALEXANDER, ML HEMBERGER, PH CISPER, ME NOGAR, NS TI LASER-DESORPTION IN A QUADRUPOLE ION-TRAP - MIXTURE ANALYSIS USING POSITIVE AND NEGATIVE-IONS SO ANALYTICAL CHEMISTRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; POLYCYCLIC AROMATIC-HYDROCARBONS; DISSOCIATION; SPECTROSCOPY; AFFINITIES; RADIATION; ABLATION; BEHAVIOR; CHROMIUM; QUISTOR AB We demonstrate the generation of both negative and positive ions by laser desorption directly within a quadrupole ion trap and the application of this method to analyze complex samples containing compounds such as explosive residues, metal complexes, and polynuclear aromatic hydrocarbons. In some cases the ability to rapidly switch between positive and negative ion modes provides sufficient specificity to distinguish different compounds of a mixture with a single stage of mass spectrometry. In other experiments, we combine intensity variation studies with tandem mass spectrometry experiments and positive and negative ion detection to further enhance specificity. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. NR 55 TC 32 Z9 32 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUN 1 PY 1993 VL 65 IS 11 BP 1609 EP 1614 DI 10.1021/ac00059a021 PG 6 WC Chemistry, Analytical SC Chemistry GA LE351 UT WOS:A1993LE35100024 ER PT J AU SESSLER, DI SESSLER, AM HUDSON, S MOAYERI, A AF SESSLER, DI SESSLER, AM HUDSON, S MOAYERI, A TI HEAT-LOSS DURING SURGICAL SKIN PREPARATION SO ANESTHESIOLOGY LA English DT Article DE HEAT, LOSS; EVAPORATION; RADIATION; HEAT, MEASUREMENT; THERMAL FLUX TRANSDUCERS; HYPOTHERMIA; MODELS, THEORETICAL; EVAPORATION; HEAT LOSS; THERMOREGULATION; TEMPERATURE, MEASUREMENT; SKIN ID FLUX AB Background: Hypothermia develops rapidly during the lst h of anesthesia and results in part from evaporative heat loss during surgical skin preparation. The authors tested the hypothesis that evaporation of skin preparation solution contributes significantly to hypothermia. Methods: Five healthy, unanesthetized volunteers were studied in a 22 +/- 0.4-degrees C environment. One thigh of each volunteer was washed for 10 min, using each of the following representative solutions. (1) water; (2) 50% ethanol in water (EtOH/H2O; similar to tincture of iodine); and (3) povidone-iodine gel. Water and EtOH/H2O each were tested at ambient temperature (cold), warmed to 40-degrees-C before application (warm), and with radiant heating of the skin, and gel only at ambient temperatures, resulting in seven study states. Heat loss and skin temperatures on the washed thighs were measured using thermal flux transducers, and values compared with the data obtained from the contralateral unwashed thighs. Change in mean body temperature (per 70 kg) due to washing was calculated by integrating measured heat loss over time and multiplying by the specific heat of human tissue. A mathematical model was developed to predict cutaneous heat loss using only skin temperature, independent of the type and temperature of skin-preparation solution or the use of radiant heating during preparation. Results. Heat loss from the unwashed thigh was almost-equal-to 14 kcal/m2 during radiant warming and almost-equal-to 39 kcal/m2 without warming. Net heat loss (increment produced by washing) was almost-equal-to 30 kcal/m2 with water and gel without radiant warming, but loss was larger with EtOH/H2O than with water under all study conditions. Radiant warming reduced total heat loss (increment produced by washing and environment) during both the EtOH/H2O and water trials, compared with warm or cold EtOH/H2O and water alone. The calculated decreases in mean body temperature per 70 kg ranged from -0.2 to -0.7-degrees C/M2. The smallest decrease occurred during radiant warming and washing with water, and the largest decreases during warm or cold EtOH/H2O. Conclusions. Heat loss was significantly less with water-based than with alcohol-based solutions. Though heating the solutions and radiant warming decreased heat loss, such loss under each tested condition, even per square meter of washed surface, was small compared to other causes of perioperative hypothermia. Consequently, the authors recommend that efforts to maintain intraoperative normothermia be directed elsewhere. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SESSLER, DI (reprint author), UNIV CALIF SAN FRANCISCO,DEPT ANESTHESIA,ROOM C-214,SAN FRANCISCO,CA 94143, USA. FU NIGMS NIH HHS [GM39723] NR 15 TC 21 Z9 21 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD JUN PY 1993 VL 78 IS 6 BP 1055 EP 1064 DI 10.1097/00000542-199306000-00007 PG 10 WC Anesthesiology SC Anesthesiology GA LG132 UT WOS:A1993LG13200007 PM 8512098 ER PT J AU SEROT, O CARJAN, N STROTTMAN, D NIETO, MM AF SEROT, O CARJAN, N STROTTMAN, D NIETO, MM TI QUANTUM TUNNELING IN MULTIWELL POTENTIALS SO ANNALES DE PHYSIQUE LA English DT Article ID RESONANCES; MODEL AB Tunneling phenomena occurring in potentials with several minima are discussed using a generalization of Landau's approach. In particular, the strong influence of the shape of the potential on the tunneling probabilities (resonances) and on the shape of a time-dependent wave packet (coherence) is shown for the case of the asymetric double square-well potential. Finally, these features are illustrated for more realistic potentials by numerically solving the time-dependent Schrodinger equation in one and two dimensions. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SEROT, O (reprint author), UNIV BORDEAUX 1,CEN,F-33175 GRADIGNAN,FRANCE. NR 16 TC 3 Z9 3 U1 1 U2 2 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0003-4169 J9 ANN PHYS-PARIS JI Ann. Phys.-Paris PD JUN PY 1993 VL 18 IS 3 BP 275 EP 298 DI 10.1051/anphys:01993001803027500 PG 24 WC Physics, Multidisciplinary SC Physics GA MP878 UT WOS:A1993MP87800003 ER PT J AU JONES, DW AF JONES, DW TI SPATIAL STRUCTURES - BECKMANN,MJ, PUU,T SO ANNALS OF REGIONAL SCIENCE LA English DT Book Review RP JONES, DW (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37830, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0570-1864 J9 ANN REGIONAL SCI JI Ann. Reg. Sci. PD JUN PY 1993 VL 27 IS 2 BP 188 EP 189 PG 2 WC Environmental Studies; Geography SC Environmental Sciences & Ecology; Geography GA LG840 UT WOS:A1993LG84000012 ER PT J AU DOBSON, J AF DOBSON, J TI SPATIAL LOGIC IN PALEOGRAPHY AND THE EXPLANATION OF CONTINENTAL-DRIFT - REPLY SO ANNALS OF THE ASSOCIATION OF AMERICAN GEOGRAPHERS LA English DT Letter RP DOBSON, J (reprint author), OAK RIDGE NATL LAB,DIV COMP & TELECOMMUN,POB 2008,OAK RIDGE,TN 37831, USA. NR 6 TC 1 Z9 1 U1 0 U2 1 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0004-5608 J9 ANN ASSOC AM GEOGR JI Ann. Assoc. Am. Geogr. PD JUN PY 1993 VL 83 IS 2 BP 369 EP 370 DI 10.1111/j.1467-8306.1993.tb01940.x PG 2 WC Geography SC Geography GA LF910 UT WOS:A1993LF91000009 ER PT J AU JUDD, AK SCHNEIDER, M SADOWSKY, MJ DEBRUIJN, FJ AF JUDD, AK SCHNEIDER, M SADOWSKY, MJ DEBRUIJN, FJ TI USE OF REPETITIVE SEQUENCES AND THE POLYMERASE CHAIN-REACTION TECHNIQUE TO CLASSIFY GENETICALLY RELATED BRADYRHIZOBIUM-JAPONICUM SEROCLUSTER 123 STRAINS SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID RHIZOBIUM-JAPONICUM; GENOME; SEROGROUP-123; NODULATION; DIVERSITY; HOMOLOGY; ELEMENTS AB We have determined that repetitive (repetitive extragenic palindromic [REP] and enterobacterial repetitive intergenic consensus [ERIC]) sequences used in conjunction with the polymerase chain reaction technique (REP and ERIC PCR) provide an effective means of differentiating between and classifying genetically related Bradyrhizobium japonicum serocluster 123 strains. Analysis of REP and ERIC PCR-generated dendrograms indicated that this technique can effectively differentiate between closely related strains which were indistinguishable by using other classification methods. To maximize the genomic differences detected by REP and ERIC PCR fingerprint patterns, the REP and the ERIC data sets were combined for statistical analyses. REP-plus-ERIC PCR fingerprints were also found to provide a method to differentiate between highly diverse strains of Bradyrhizobium spp., but they did not provide an effective means for classifying these strains because of the relatively low number of REP and ERIC consensus sequences found in some of the bradyrhizobia. Our results also suggest that there is a relationship between nodulation phenotypes and the distribution of REP and ERIC consensus sequences within the genomes of B. japonicum serogroup 123 and 127 strains. Results obtained by restriction fragment length polymorphism hybridization analyses were correlated with the phylogenetic classification of B. japonicum serocluster 123 strains obtained by using REP and ERIC PCR. C1 UNIV MINNESOTA,DEPT SOIL SCI,ST PAUL,MN 55108. UNIV MINNESOTA,DEPT MICROBIOL,ST PAUL,MN 55108. MICHIGAN STATE UNIV,DEPT MICROBIOL,DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,NSF CTR MICROBIAL ECOL,E LANSING,MI 48824. RI Sadowsky, Michael/J-2507-2016 OI Sadowsky, Michael/0000-0001-8779-2781 NR 25 TC 112 Z9 123 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD JUN PY 1993 VL 59 IS 6 BP 1702 EP 1708 PG 7 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA LF171 UT WOS:A1993LF17100002 PM 8101072 ER PT J AU SEITZ, JC PASTERIS, JD MORGAN, GB AF SEITZ, JC PASTERIS, JD MORGAN, GB TI QUANTITATIVE-ANALYSIS OF MIXED VOLATILE FLUIDS BY RAMAN MICROPROBE SPECTROSCOPY - A CAUTIONARY NOTE ON SPECTRAL RESOLUTION AND PEAK SHAPE SO APPLIED SPECTROSCOPY LA English DT Article DE RAMAN SPECTROSCOPY; SPECTRAL RESOLUTION; CO2-CH4-N2 GAS MIXTURES; QUANTITATIVE ANALYSIS ID O-H-N; INCLUSIONS AB Raman analyses of fluid inclusions can yield quantitative information on composition (from peak areas and heights) and density (from peak position and width). In this study, we examine the effect of instrumental spectral resolution on the ratios of these spectral parameters, and the selection of appropriate integration limits for the determination of peak areas in the CO2-CH4-N2 system. Spectral resolution was varied from about 1 to 9 cm-1 by co-varying the widths of all spectrometer slits. Changes in resolution produced a modest effect on peak-area ratios and a significant effect on peak-height ratios. Measured peak-width ratios varied strongly as a function of the spectral resolution. In addition, we observed a moderate shift in the measured peak position of N2, which can be related to the asymmetry of the band. These results indicate that accurate analysis requires careful attention to the selection of quantification factors, especially if the selected values were derived from studies at different spectral resolutions. Another factor that can have a significant effect on the calculated compositions of CH4- and H-2-bearing fluid mixtures is the band broadening that occurs with increasing pressure. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. WASHINGTON UNIV,DEPT EARTH & PLANETARY SCI,ST LOUIS,MO 63130. RP SEITZ, JC (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,BLDG 4500S,OAK RIDGE,TN 37831, USA. NR 15 TC 4 Z9 5 U1 0 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUN PY 1993 VL 47 IS 6 BP 816 EP 820 DI 10.1366/0003702934067045 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA LH828 UT WOS:A1993LH82800020 ER PT J AU SCHMIDT, BP KIRSHNER, RP SCHILD, R LEIBUNDGUT, B JEFFERY, D WILLNER, SP PELETIER, R ZABLUDOFF, AI PHILLIPS, MM SUNTZEFF, NB HAMUY, M WELLS, LA SMITH, RC BALDWIN, JA WELLER, WG NAVARETTE, M GONZALEZ, L FILIPPENKO, AV SHIELDS, JC STEIDEL, CC PERLMUTTER, S PENNYPACKER, C SMITH, CK PORTER, AC BOROSON, TA STATHAKIS, R CANNON, R PETERS, J HORINE, E FREEMAN, KC WOMBLE, DS STONE, RPS MARSCHALL, LA PHILLIPS, AC SAHA, A BOND, HE AF SCHMIDT, BP KIRSHNER, RP SCHILD, R LEIBUNDGUT, B JEFFERY, D WILLNER, SP PELETIER, R ZABLUDOFF, AI PHILLIPS, MM SUNTZEFF, NB HAMUY, M WELLS, LA SMITH, RC BALDWIN, JA WELLER, WG NAVARETTE, M GONZALEZ, L FILIPPENKO, AV SHIELDS, JC STEIDEL, CC PERLMUTTER, S PENNYPACKER, C SMITH, CK PORTER, AC BOROSON, TA STATHAKIS, R CANNON, R PETERS, J HORINE, E FREEMAN, KC WOMBLE, DS STONE, RPS MARSCHALL, LA PHILLIPS, AC SAHA, A BOND, HE TI PHOTOMETRIC AND SPECTROSCOPIC OBSERVATIONS OF SN-1990E IN NGC-1035 - OBSERVATIONAL CONSTRAINTS FOR MODELS OF TYPE-II SUPERNOVAE SO ASTRONOMICAL JOURNAL LA English DT Article ID LARGE MAGELLANIC CLOUD; BOLOMETRIC LIGHT-CURVE; DISTANCE SCALE; STANDARD STARS; CERRO-TOLOLO; SN-1987A; 1987A; SPECTROPHOTOMETRY; EMISSION; NGC-4618 AB We present 126 photometric and 30 spectral observations of SN 1990E spanning from 12 days before B maximum to 600 days past discovery. These observations show that SN 1990E was of type II-P, displaying hydrogen in its spectrum, and the characteristic plateau in its light curve. SN 1990E is one of the few SNe II which has been well observed before maximum light, and we present evidence that this SN was discovered very soon after its explosion. In the earliest spectra we identify, for the first time, several N II lines. We present a new technique for measuring extinction to SNe II based on the evolution of absorption lines, and use this method to estimate the extinction to SN 1990E, A(V) = 1.5 +/- 0. 3 mag. From our photometric data we have constructed a bolometric light curve for SN 1990E and show that, even at the earliest times, the bolometric luminosity was falling rapidly. We use the late-time bolometric light curve to show that SN 1990E trapped a majority of the gamma rays produced by the radioactive decay of Co-56, and estimate that SN 1990E ejected 0.073+0.018/+0.051 M. of Ni-56, an amount virtually identical to that of SN 1987A. C1 CERRO TOLOLO INTERAMER OBSERV,LA SERENA,CHILE. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. KITT PEAK NATL OBSERV,TUCSON,AZ 85702. ANGLO AUSTRALIAN OBSERV,EPPING,NSW 2121,AUSTRALIA. EL WHIPPLE OBSERV,AMADO,AZ 85721. AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,WODEN,ACT 2606,AUSTRALIA. UNIV CALIF SAN DIEGO,CTR ASTROPHYS & SPACE SCI,LA JOLLA,CA 92093. UNIV CALIF SANTA CRUZ,LICK OBSERV,SANTA CRUZ,CA 95064. GETTYSBURG COLL,DEPT PHYS,GETTYSBURG,PA 17325. UNIV WASHINGTON,DEPT ASTRON FM20,SEATTLE,WA 98195. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP SCHMIDT, BP (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138, USA. RI Peletier, Reynier/B-9633-2012; Smith, Craig/D-7927-2015; Perlmutter, Saul/I-3505-2015; Hamuy, Mario/G-7541-2016; OI Smith, Craig/0000-0001-5829-8303; Perlmutter, Saul/0000-0002-4436-4661; Schmidt, Brian/0000-0001-6589-1287; SAHA, ABHIJIT/0000-0002-6839-4881 NR 66 TC 47 Z9 47 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUN PY 1993 VL 105 IS 6 BP 2236 EP 2250 DI 10.1086/116602 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LE322 UT WOS:A1993LE32200024 ER PT J AU LIANG, EP LI, H AF LIANG, EP LI, H TI POSSIBLE STELLAR FLARE CONTRIBUTIONS TO THE BATSE GAMMA-RAY BURST DATABASE SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE GAMMA-RAYS, BURSTS; STARS, FLARE ID AD LEONIS AB We examine the possibility that strong gamma ray flares from nearby flare stars may contribute to the faint BATSE (Burst and Transient Sources Experiment on the Compton Gamma-Ray Observatory) triggers. BATSE logN - logC distribution limits the fraction of events that can be due to flares and the flare luminosity function and space density. New anisotropy limits on the residual nonflare events are obtained and several concrete steps to test this hypothesis are discussed. C1 LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. RP LIANG, EP (reprint author), RICE UNIV, DEPT SPACE PHYS & ASTRON, HOUSTON, TX 77251 USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JUN PY 1993 VL 273 IS 2 BP L53 EP L55 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ207 UT WOS:A1993LJ20700005 ER PT J AU BAZAN, G LATTANZIO, JC AF BAZAN, G LATTANZIO, JC TI ENERGY GENERATION IN CONVECTIVE SHELLS OF LOW-MASS, LOW-METALLICITY ASYMPTOTIC GIANT BRANCH STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE CONVECTION; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, INTERIORS ID S-PROCESS NUCLEOSYNTHESIS; CAPTURE CROSS-SECTIONS; POST-AGB STARS; NEUTRON-CAPTURE; CHEMICAL-COMPOSITION; RED GIANTS; PROCESS ABUNDANCES; MODELS; RATES; MS AB We report on the nonnegligible energy released by the C-13(alpha, n)O-16 reaction and the related neutron capture reactions in interior convective shells developed during the thermal pulsation phase of asymptotic giant branch (AGB) stars of low mass and low metallicity. Over 10(4) L. are generated within a thermal pulse convective shell from the combination of the C-13(alpha, n)O-16, neutron capture, and beta decay reactions. The inclusion of this energy source in the theoretical evolution of an AGB thermal pulse is shown to alter the evolution of the convective shell boundaries and, hence, how the C-13 is ingested into the convective shell. By iterating between a nucleosynthesis code and a stellar model, we find a ''converged'' model in which the neutron density arising from the C-13 source is substantially higher and the overall mean exposure of the irradiated material is lower than cases where no energy is taken into account. With these modifications in s-process parameters, the calculated abundance ratios for r-only to s-only nuclei at the same mass number remains surprisingly constant, but still does not eliminate the overproduction of Zr-96, which disagrees with observation. C1 UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. MONASH UNIV,DEPT MATH,CLAYTON,VIC 3168,AUSTRALIA. UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. RP BAZAN, G (reprint author), UNIV TEXAS,MCDONALD OBSERV,AUSTIN,TX 78712, USA. NR 34 TC 10 Z9 10 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 1 PY 1993 VL 409 IS 2 BP 762 EP 769 DI 10.1086/172705 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LC832 UT WOS:A1993LC83200025 ER PT J AU BEIERSDORFER, P PHILLIPS, T JACOBS, VL HILL, KW BITTER, M VONGOELER, S AF BEIERSDORFER, P PHILLIPS, T JACOBS, VL HILL, KW BITTER, M VONGOELER, S TI HIGH-RESOLUTION MEASUREMENTS, LINE IDENTIFICATION, AND SPECTRAL MODELING OF K-ALPHA TRANSITIONS IN FE-XVIII-FE-XXV SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; X-RAYS, GENERAL ID X-RAY-SPECTRA; INNER-SHELL TRANSITIONS; DIELECTRONIC SATELLITE SPECTRA; SOLAR-FLARES; CRYSTAL SPECTROMETER; LABORATORY PLASMAS; ION TEMPERATURE; RESONANCE LINE; IRON; TOKAMAKS AB A detailed analysis of the iron Kalpha emission spectrum covering the wavelength region from 1.840 to 1.9 angstrom is presented. Measurements are made with a high-resolution Bragg crystal spectrometer on the Princeton Large Torus (PLT) tokamak for plasma conditions which closely resemble those of solar flares. A total of 40 features are identified, consisting of either single or multiple lines from eight charge states in iron, Fe XVIII-Fe XXV, and their wavelengths are determined with an accuracy of 0.1-0.4 mangstrom. Many of these features are identified for the first time. In the interpretation of our observations we rely on model calculations that determine the ionic species abundances from electron density and temperature profiles measured indePendently with nonspectroscopic techniques and that incorporate theoretical collisional excitation and dielectronic recombination rates resulting in the excitation of the ls2s(r)2p(s) configurations. The model calculations also include the effect of diffusive ion transport. Good overall agreement between the model calculations and the observations is obtained, which gives us confidence in our line identifications and spectral modeling capabilities. The results are compared with earlier analyses of the Kalpha emission from the Sun. While many similarities are found, a few differences arise from the somewhat higher electron density in tokamak plasmas (10(13) cm-3), which affects the fine-structure level populations of the ground states of the initial ion undergoing electron-impact excitation or dielectronic recombination. We also find that several spectral features are comprised of different transitions from those reported in earlier analyses of solar data. C1 USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. UNIV CALIF BERKELEY,DEPT PHYS & ASTRON,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP BEIERSDORFER, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 51 TC 66 Z9 67 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 1 PY 1993 VL 409 IS 2 BP 846 EP 859 DI 10.1086/172715 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LC832 UT WOS:A1993LC83200035 ER PT J AU SUPERKO, HR HASKELL, WL KRAUSS, RM AF SUPERKO, HR HASKELL, WL KRAUSS, RM TI ASSOCIATION OF LIPOPROTEIN SUBCLASS DISTRIBUTION WITH USE OF SELECTIVE AND NONSELECTIVE BETA-BLOCKER MEDICATIONS IN PATIENTS WITH CORONARY HEART-DISEASE SO ATHEROSCLEROSIS LA English DT Article DE LOW DENSITY LIPOPROTEIN; HIGH DENSITY LIPOPROTEIN; SMALL LDL; LIPOPROTEIN HETEROGENEITY ID LOW-DENSITY LIPOPROTEINS; ANTIHYPERTENSIVE AGENTS; ARTERY DISEASE; LIPIDS; RISK; HYPERTENSION; CHOLESTEROL; PROPRANOLOL; PRAZOSIN AB The relationship of beta-blocker drug use to plasma low density lipoprotein-cholesterol (LDL-C), lipoprotein mass distribution, (LDL, S(f)0-12), intermediate density lipoproteins (IDL, S(f)12-20), very low density lipoproteins (VLDL, S(f)20-400), and high density lipoproteins (HDL, F(1.2)0-9) were examined in 206 men with coronary heart disease. Thirty-three used non-selective (NSEL), 49 used selective (SEL), and were compared to 124 who used no beta-blockade (NoBB). No significant between group differences were seen for potentially confounding variables. LDL and IDL mass, total cholesterol and LDL-cholesterol were not significantly different between groups. HDL-C was significantly lower in both NSEL (P < 0.005) and SEL (P < 0.01). NSEL and SEL had significantly lower HDL mass (P < 0.005 and P < 0.02), HDL2 mass (P < 0.01 and P = 0.06), and HDL3 mass (P < 0.01 and P < 0.05). VLDL mass was significantly higher (P < 0.02) only in NSEL. Small LDL (S(f)0-7) was not significantly different between groups and large LDL (S(f)7-12) was significantly lower in NSEL (P < 0.05) and SEL (P < 0.05). LDL peak Sf was significantly lower in both NSEL (P < 0.005) and SEL (P < 0.02) compared to NoBB. Despite the lack of differences in levels of LDL-cholesterol, beta-blocker use is associated with a significant difference in the distribution of larger, more buoyant to smaller, more dense LDL particles. Reduced HDL levels in subjects on beta-blockade therapy are associated with reductions in both HDL2 and HDL3 subclasses. These results suggest that beta-blocker use may predispose to expression of a relatively atherogenic lipoprotein subclass profile. C1 STANFORD UNIV,MED CTR,SCH MED,STANFORD,CA 94305. RP SUPERKO, HR (reprint author), LAWRENCE BERKELEY LAB,DEPT MOLEC & NUCL MED,DIV LIFE SCI,DONNER LAB ROOM 465,BERKELEY,CA 94720, USA. OI Superko, H. Robert/0000-0002-3542-0393 FU NHLBI NIH HHS [HL18574, HL28292, HL33577] NR 29 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0021-9150 J9 ATHEROSCLEROSIS JI Atherosclerosis PD JUN PY 1993 VL 101 IS 1 BP 1 EP 8 DI 10.1016/0021-9150(93)90095-C PG 8 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA LM696 UT WOS:A1993LM69600001 PM 8105786 ER PT J AU PUXBAUM, H NOVAKOV, T AF PUXBAUM, H NOVAKOV, T TI 4TH INTERNATIONAL-CONFERENCE ON CARBONACEOUS PARTICLES IN THE ATMOSPHERE - VIENNA, AUSTRIA 3-5 APRIL 1991 - INTRODUCTION SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP PUXBAUM, H (reprint author), VIENNA TECH UNIV,INST ANALYT CHEM,A-1040 VIENNA,AUSTRIA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1993 VL 27 IS 8 BP 1167 EP 1167 DI 10.1016/0960-1686(93)90243-R PG 1 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LJ390 UT WOS:A1993LJ39000001 ER PT J AU PENNER, JE EDDLEMAN, H NOVAKOV, T AF PENNER, JE EDDLEMAN, H NOVAKOV, T TI TOWARDS THE DEVELOPMENT OF A GLOBAL INVENTORY FOR BLACK CARBON EMISSIONS SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON CARBONACEOUS PARTICLES IN THE ATMOSPHERE CY APR 03-05, 1991 CL VIENNA, AUSTRIA SP AUSTRIAN FED MINIST ENVIRONM, AUSTRIAN FED MINIST SCI & TECHNOL, AUSTRIAN SOC ANAL CHEM, TECH UNIV VIENNA, INST ANAL CHEM DE BLACK CARBON; AEROSOLS; EMISSION INVENTORY ID LONG-RANGE TRANSPORT; PARTICULATE ELEMENTAL CARBON; AEROSOL LIGHT-ABSORPTION; ATMOSPHERIC AEROSOL; SIZE DISTRIBUTION; RADIATIVE-TRANSFER; SCAVENGING RATIOS; GRAPHITIC CARBON; COAL COMBUSTION; SOOT CARBON AB We have developed two global inventories for black carbon (BC) emissions using two distinct methods. The first method uses measured ambient concentration ratios of BC and SO2 at locations throughout the world. We demonstrate that BC to SO2 ratios are well correlated at most sites and that distinct ratios of BC to SO2 apply to source areas from economically distinct regions. However, within any one economic region, the ratio of BC to SO2 appears to be relatively constant. These facts are used to construct a global inventory of BC emissions by using previously published inventories for the emissions of sulfur. The derived inventory totals nearly 24 Tg C yr-1. The second method uses estimated emission factors and published fuel production and use statistics for wood and bagasse burning, diesel fuel, and domestic and commercial coal use. The combined global emissions using the second method total 12.6 Tg C yr-1. A comparison of the two inventories shows that the estimated emissions from the ratio method are within a factor of two of those derived from emission factors in regions where the data appear to be reliable. The BC inventory from the ratio method is used in the Lawrence Livermore National Laboratory global chemistry/climate model to simulate the world wide distribution of BC. The predicted concentrations are compared with available measurements from throughout the world. This comparison also supports the magnitude of the inventory which we derived from the ratio method to within about a factor of two. C1 LAWRENCE LIVERMORE NATL LAB,DIV APPL SCI,LIVERMORE,CA 94550. RP PENNER, JE (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ATMOSPHER & GEOPHYS SCI,POB 808,LIVERMORE,CA 94550, USA. RI Penner, Joyce/J-1719-2012 NR 109 TC 242 Z9 255 U1 4 U2 23 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1993 VL 27 IS 8 BP 1277 EP 1295 DI 10.1016/0960-1686(93)90255-W PG 19 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LJ390 UT WOS:A1993LJ39000013 ER PT J AU BIZJAK, M CIGLER, R HANSEN, ADA HUDNIK, V AF BIZJAK, M CIGLER, R HANSEN, ADA HUDNIK, V TI DIURNAL CONCENTRATIONS OF BLACK CARBON AND SOME OTHER AIR-POLLUTANTS IN LJUBLJANA, SLOVENIA SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON CARBONACEOUS PARTICLES IN THE ATMOSPHERE CY APR 03-05, 1991 CL VIENNA, AUSTRIA SP AUSTRIAN FED MINIST ENVIRONM, AUSTRIAN FED MINIST SCI & TECHNOL, AUSTRIAN SOC ANAL CHEM, TECH UNIV VIENNA, INST ANAL CHEM DE DIURNAL CONCENTRATION; AEROSOL BLACK CARBON; GASEOUS POLLUTANTS ID AEROSOL AB We report on measurements from an automated air pollution and meteorological station operating in the city center of Ljubljana, Slovenia. Aerosol black carbon, SO2, NO and NO2 were measured continuously on a 30-min timebase. Filter samples integrated over periods of 1-3 days were analysed for total particulate carbon and sulfur species. Large variations of pollutant concentrations were seen, correlating with emission source activity and periods of meteorological stagnation. Correlations between primary (BC) and secondary (S(P)) species were seen, suggesting a rapid SO2 to sulfate conversion mechanism. We discuss the influence of meteorology and primary emission activity on air quality in the city. C1 HYDROMETEOROL INST SLOVENIA,61001 LJUBLJANA,SLOVENIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BIZJAK, M (reprint author), INST CHEM,POB 30,61115 LJUBLJANA,SLOVENIA. NR 6 TC 4 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1993 VL 27 IS 8 BP 1347 EP 1350 DI 10.1016/0960-1686(93)90260-6 PG 4 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LJ390 UT WOS:A1993LJ39000018 ER PT J AU GUNTER, RL HANSEN, ADA BOATMAN, JF BODHAINE, BA SCHNELL, RC GARVEY, DM AF GUNTER, RL HANSEN, ADA BOATMAN, JF BODHAINE, BA SCHNELL, RC GARVEY, DM TI AIRBORNE MEASUREMENTS OF AEROSOL OPTICAL-PROPERTIES OVER SOUTH-CENTRAL NEW-MEXICO SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON CARBONACEOUS PARTICLES IN THE ATMOSPHERE CY APR 03-05, 1991 CL VIENNA, AUSTRIA SP AUSTRIAN FED MINIST ENVIRONM, AUSTRIAN FED MINIST SCI & TECHNOL, AUSTRIAN SOC ANAL CHEM, TECH UNIV VIENNA, INST ANAL CHEM DE NEPHELOMETER; AETHALOMETER; BLACK CARBON; OPTICAL THICKNESS; ABSORPTION; SCATTERING; EXTINCTION ID CARBON AB We used a three wavelength nephelometer (449, 536 and 690 nm) and an aethalometer on board the NOAA King Air research aircraft to assess the contributions of aerosol optical scattering and absorption to shortwave extinction. The measurements were made over south-central New Mexico in February and July 1989. The winter measurements revealed a shallow, polluted planetary boundary layer with cleaner air above. The summer measurements showed a uniformly mixed planetary boundary layer extending from ground level to the operational ceiling of 4.5 km above ground. In both cases the total optical thickness values for the column were similar (0.03) and the fractional contribution of aerosol absorption to the extinction was between 5 and 10%. These results suggest that the aerosol extinction in summer and winter is similar, even though the planetary boundary layer thickness is quite different during the two seasons. They also demonstrate that a suitably instrumented light aircraft can profile the optical properties of the troposphere with high sensitivity and good spatial resolution. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NOAA,ERL,CLIMATE MONITORING & DIAGNOST LAB,BOULDER,CO 80303. UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. ATMOSPHER SCI LAB,WHITE SANDS MISSILE RANGE,NM 88002. RP GUNTER, RL (reprint author), NOAA,ERL,AIR RESOURCES LAB,AEROSOL RES SECT,325 BROADWAY REARX1,BOULDER,CO 80303, USA. NR 13 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD JUN PY 1993 VL 27 IS 8 BP 1363 EP 1368 DI 10.1016/0960-1686(93)90262-W PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LJ390 UT WOS:A1993LJ39000020 ER PT J AU SASTRY, SS SPIELMANN, HP HOANG, QS PHILLIPS, AM SANCAR, A HEARST, JE AF SASTRY, SS SPIELMANN, HP HOANG, QS PHILLIPS, AM SANCAR, A HEARST, JE TI LASER-INDUCED PROTEIN-DNA CROSS-LINKS VIA PSORALEN FURANSIDE MONOADDUCTS SO BIOCHEMISTRY LA English DT Article ID T7 RNA-POLYMERASE; UV-A-IRRADIATION; ESCHERICHIA-COLI; SINGLET OXYGEN; ULTRAVIOLET-IRRADIATION; ELONGATION COMPLEXES; NUCLEOTIDE-SEQUENCE; STRANDED DNA; SITE; IDENTIFICATION AB We have developed a technique for cross-linking DNA binding proteins to DNA using psoralen furanside monoadducts as photoaffinity probes and a continuous-wave argon ion laser (366 nm) as a light source. Several DNA binding proteins (T7 RNA polymerase, UvrB, single-stranded DNA binding protein of Escherichia coli, T4 gp32, and RecA of E. coli) are shown to cross-link to single-stranded psoralen monoadducted DNA oligos differing in length and sequence. Increasing fluences of laser light on a fixed ratio of DNA/protein resulted in an increase in the yield of cross-links. Titration experiments were carried out to measure the apparent cross-linking constant (K(appXL)) for T7 RNA polymerase or UvrB to a monoadducted 24 mer DNA. The estimated values for the apparent cross-linking constant were in the range of (2-3) X 10(-7) M for both T7 RNA polymerase and UvrB. The efficiency of cross-linking was investigated as a function of the length of adducted DNA and also as a fraction of the total noncovalent binding of proteins of psoralenated DNAs. The results showed that in the cases of T7 RNA polymerase and UvrB cross-linking was more efficient with short oligos (8 and 19 mers) as compared to longer oligos (50 mer). A tryptic peptide of T7 RNA polymerase that was conjugated to a psoralen furanside monoadducted 12 mer DNA was isolated by high-performance liquid chromatography. Mass spectrometry and amino acid composition of this peptide revealed that it originated from a region between residues 558 and 608 of the primary structure of T7 RNA polymerase. Two other peptides cross-linked to oligos were also purified. Repeated attempts to perform Edman sequencing of the peptide-DNA conjugates failed. Overall evidence indicates that photo-cross-linking of furanside monoadducts occurred at multiple sites on the proteins. We have shown that T7 RNA polymerase molecules in a ternary complex arrested at the furanside monoadduct can be cross-linked to the DNA templates with laser light. Evidence suggests that the arrested polymerase molecules existed in multiple conformations on the DNA template. This method of transcriptional cross-linking offers a new method for preparing highly stable elongation complexes for further studies. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV N CAROLINA,DEPT BIOCHEM,CHAPEL HILL,NC 27599. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. FU NCEH CDC HHS [NIEHS 07075-11]; NIGMS NIH HHS [GM41911, GM 32833] NR 67 TC 31 Z9 31 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUN 1 PY 1993 VL 32 IS 21 BP 5526 EP 5538 DI 10.1021/bi00072a006 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LF063 UT WOS:A1993LF06300006 PM 8504073 ER PT J AU SAXTON, MJ AF SAXTON, MJ TI LATERAL DIFFUSION IN AN ARCHIPELAGO - SINGLE-PARTICLE DIFFUSION SO BIOPHYSICAL JOURNAL LA English DT Article ID RANDOM-WALKS; DISORDERED MEDIA; FRACTAL CLUSTERS; MEMBRANE; PERCOLATION; MOVEMENTS; ERYTHROCYTES; DEPENDENCE; MOBILITY; PROTEINS AB Several laboratories have measured lateral diffusion of single particles on the cell surface, and these measurements may reveal an otherwise inaccessible level of submicroscopic organization of cell membranes. Pitfalls in the interpretation of these experiments are analyzed. Random walks in unobstructed systems show structure that could be interpreted as free diffusion, obstructed diffusion, directed motion, or trapping in finite domains. To interpret observed trajectories correctly, one must consider not only the trajectories themselves but also the probabilities of occurrence of various trajectories. Measures of the asymmetry of obstructed and unobstructed random walks are calculated, and probabilities are evaluated for random trajectories that resemble either directed motion or diffusion in a bounded region. C1 LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. RP SAXTON, MJ (reprint author), UNIV CALIF DAVIS,INST THEORET DYNAM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM-38133] NR 51 TC 195 Z9 201 U1 1 U2 17 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD JUN PY 1993 VL 64 IS 6 BP 1766 EP 1780 PG 15 WC Biophysics SC Biophysics GA LJ216 UT WOS:A1993LJ21600014 PM 8369407 ER PT J AU SCOTT, DA WELT, M LEUNG, FC AF SCOTT, DA WELT, M LEUNG, FC TI A COMPUTER-PROGRAM TO AID IN CALCULATING SIMILARITY INDEXES FROM DNA FINGERPRINTS SO BIOTECHNIQUES LA English DT Article AB DNA SIMDEX is a DOS-based computer program designed to assist in the visual scoring of DNA fingerprint assays. DNA SIMDEX uses the migration distances of the individual DNA bands to generate lists of probable matching and nonmatching bands and automatically calculates a probable similarity index between DNA fingerprints based on these initial predictions. After comparisons are edited by the user, the final similarity index, along with accompanying data, can be saved on a floppy disk or hard drive for easy storage and retrieval or can be printed directly on a laser or line printer. The program has been developed to function with or without an image-analysis system, thus making it an inexpensive alternative for small laboratories. C1 PACIFIC NW LAB, MAIL STOP K4-13, POB 999, RICHLAND, WA 99352 USA. NR 4 TC 6 Z9 6 U1 0 U2 0 PU BIOTECHNIQUES OFFICE PI NEW YORK PA 52 VANDERBILT AVE, NEW YORK, NY 10017 USA SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD JUN PY 1993 VL 14 IS 6 BP 980 EP 983 PG 4 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LF326 UT WOS:A1993LF32600024 PM 8333966 ER PT J AU HOLBROOK, SR DUBCHAK, I KIM, SH AF HOLBROOK, SR DUBCHAK, I KIM, SH TI PROBE - A COMPUTER-PROGRAM EMPLOYING AN INTEGRATED NEURAL-NETWORK APPROACH TO PROTEIN-STRUCTURE PREDICTION SO BIOTECHNIQUES LA English DT Article ID SECONDARY STRUCTURE; DATA-BANK; SEQUENCE AB A computer program, PROBE, has been designed for the prediction of protein structural features from amino acid sequence. This program integrates a variety of computer-simulated neural networks, each predicting an aspect of protein structure, into a single, easy-to-use package. The surface accessibility of each residue, the presence of disulfide bonds, the overall secondary structure composition and the residue secondary structures, including beta-turn type, are predicted. In addition, the overall amino acid composition and relative hydrophobicity are used to determine whether a protein belongs to one of four common folding motifs. PROBE is able to compare and synergistically improve the predictions by allowing communication between the different networks. RP HOLBROOK, SR (reprint author), LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720, USA. NR 21 TC 11 Z9 11 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD JUN PY 1993 VL 14 IS 6 BP 984 EP 989 PG 6 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LF326 UT WOS:A1993LF32600025 PM 8333967 ER PT J AU DAVISON, BH THOMPSON, JE AF DAVISON, BH THOMPSON, JE TI SUSTAINED DEGRADATION OF N-PENTANE AND ISOBUTANE IN A GAS-PHASE BIOREACTOR SO BIOTECHNOLOGY LETTERS LA English DT Article AB Microorganisms were able to remove hydrocarbons (pentane and isobutane) from air by biological action in a columnar bioreactor with ceramic packing. The reactor was operated in a liquid continuous mode with gas recirculation and a slow addition of the organic-containing air. After a period of acclimation, the reactor has operated for 12 months with only pentane and isobutane as carbon sources. The gaseous hydrocarbons have been degraded throughout this period. The hydrocarbon removal rates measured between 1 and 2 g h-1 m-3. The microbes were shown to be able to degrade these gaseous hydrocarbons completely in a closed bioreactor without any additional nutrients. RP DAVISON, BH (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Davison, Brian/D-7617-2013 OI Davison, Brian/0000-0002-7408-3609 NR 9 TC 8 Z9 8 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0141-5492 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD JUN PY 1993 VL 15 IS 6 BP 633 EP 636 DI 10.1007/BF00138554 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA LJ782 UT WOS:A1993LJ78200018 ER PT J AU JACKSON, SM WONG, IG CARPENTER, GS ANDERSON, DM MARTIN, SM AF JACKSON, SM WONG, IG CARPENTER, GS ANDERSON, DM MARTIN, SM TI CONTEMPORARY SEISMICITY IN THE EASTERN SNAKE RIVER PLAIN, IDAHO BASED ON MICROEARTHQUAKE MONITORING SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID 1983 BORAH-PEAK; WESTERN UNITED-STATES; INTRAPLATE EARTHQUAKES; CRUSTAL STRUCTURE; SOURCE PARAMETERS; OCTOBER 1983; HEAT-FLOW; QUATERNARY; DEFLATION; TECTONICS AB Microearthquake monitoring by a permanent network operated since 1971 and two recent temporary surveys performed by the Idaho National Engineering Laboratory suggest that infrequent, small-magnitude earthquakes are characteristic of eastern Snake River Plain (ESRP) seismicity. Although a total of only 19 earthquakes have been observed to date, and not all have well-constrained focal depths, their relatively shallow occurrence at depths of 8 km is consistent with the hypothesis that elevated crustal temperatures in the ESRP confine the brittle portion of the crust, and hence seismogenesis, to the upper 6 to 10 km. A composite focal mechanism of two microearthquakes located near the axis of the ESRP indicates normal faulting with a minor component of strike-slip motion. The northeast-southwest-trending T-axis indicated by this composite mechanism is consistent with the direction of extension indicated by Holocene volcanic rift zones within the ESRP and normal faults in the adjacent Basin and Range province to the northwest. Based on this low level of small-magnitude seismicity, deviatoric stresses appear to be small in the ESRP. C1 WOODWARD CLYDE CONSULTANTS,OAKLAND,CA 94607. RP JACKSON, SM (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,MS 2107,IDAHO FALLS,ID 83415, USA. NR 58 TC 11 Z9 11 U1 1 U2 2 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD JUN PY 1993 VL 83 IS 3 BP 680 EP 695 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LE825 UT WOS:A1993LE82500004 ER PT J AU AMMON, CJ ZANDT, G AF AMMON, CJ ZANDT, G TI RECEIVER STRUCTURE BENEATH THE SOUTHERN MOJAVE BLOCK, CALIFORNIA SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID LATERAL VELOCITY VARIATIONS; EASTERN TRANSVERSE RANGES; TELESEISMIC BODY WAVES; EARTHQUAKE SEQUENCE; DESERT; CRUST; KINEMATICS; MODELS AB An inversion of a receiver function recorded at Lawrence Livermore National Laboratory Nevada Test Site Network Station LAC reveals a range of 1-D velocity structures that are consistent the observed waveform. The shear-velocity structure southeast of LAC is relatively simple, consisting of an approximately 30 to 34 km thick crust. All models contain relatively sharp crust-mantle boundaries with a change in velocity from about 3.5 km / sec to approximately 4.6 km / sec over a depth range of 4 to 6 kilometers. The range of models can be roughly divided into two groups that differ mostly in the mid-to-lower crust. The first model of the earth structure contains a large low-velocity zone in the middle and lower crust (shear-wave velocities as low as 2.8 km/sec), the second model contains nearly constant velocities (approximately 3.5 km/sec) through the middle-to-lower crust. In contrast with the simplicity of the southeast receiver function, the receiver functions corresponding to the northwest and southwest show the influence of lateral velocity heterogeneity and can at best be discussed qualitatively. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94551. RP AMMON, CJ (reprint author), UNIV CALIF SANTA CRUZ,INST TECTON,SANTA CRUZ,CA 95064, USA. NR 33 TC 33 Z9 35 U1 1 U2 4 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD JUN PY 1993 VL 83 IS 3 BP 737 EP 755 PG 19 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LE825 UT WOS:A1993LE82500007 ER PT J AU MAYEDA, K AF MAYEDA, K TI MB(LGCODA) - A STABLE SINGLE STATION ESTIMATOR OF MAGNITUDE SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID NEVADA TEST SITE; CODA WAVES; NUCLEAR-EXPLOSIONS; UNITED-STATES; ATTENUATION; EARTHQUAKES; SCATTERING; DISTANCES; ORIGIN AB Stable single-station estimates of magnitude have been made using the 1-Hz Lg coda envelope of regionally recorded nuclear explosions from the Nevada Test Site (NTS). After empirical relations describing the Lg coda envelope were found for each NTS-station path, single station magnitudes based on the Lg coda envelope were made with precision in the range of 0.03 to 0.04 magnitude units, whereas magnitudes based on third peak Lg amplitude, rms Lg amplitude, and Pn amplitude had scatter on the order of 0.15 to 0.2 magnitude units, generally five times larger than the coda scatter. Despite the high station correlations, the magnitude-yield residuals for events above the water table using the network average mb(LgCoda) were only marginally better than the other magnitude estimates, roughly 10% smaller. Magnitude-yield residual for events above the water table between mb(LgCoda) and mb(Lg) are strongly correlated suggesting that the source region properties, such as gas porosity, affect both magnitudes. Using only a single station, the standard deviation for magnitude-yield residuals using mb(LgCoda) were roughly 25% smaller than those derived from mb(Lg) or mb(Pn). These results show that the method is ideally suited to monitoring efforts in sparsely instrumented regions where little is known about the lateral variations of medium properties. RP MAYEDA, K (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,L-208,LIVERMORE,CA 94551, USA. NR 27 TC 30 Z9 30 U1 0 U2 0 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD JUN PY 1993 VL 83 IS 3 BP 851 EP 861 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LE825 UT WOS:A1993LE82500012 ER PT J AU TSCHAPLINSKI, TJ NORBY, RJ AF TSCHAPLINSKI, TJ NORBY, RJ TI PHYSIOLOGICAL INDICATORS OF NITROGEN RESPONSE IN A SHORT-ROTATION SYCAMORE PLANTATION .2. NITROGEN-METABOLISM SO CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE LA English DT Article DE AMINO ACIDS; NITROGEN; NITRATE REDUCTASE; SYCAMORE ID AMINO-ACIDS; SEEDLINGS; PROTEIN; NITRATE; FERTILIZATION; GROWTH; ALDER; TREES AB American sycamore (Platanus occidentalis L.) seedlings were grown in the field under different urea - nitrogen fertilization regimes to identify nitrogen variables that characterize the growth response. Treatments included fertilization with 50, 150, and 450 kg N/ha, periodic fertilization (three times during the growing season) at 37.5 kg N/ha, and an unfertilized control. Leaf total nitrogen concentration was a poor indicator of plant growth response to nitrogen fertilization. Salt-extractable protein, nitrate, and free amino acid concentrations all trended upward by the end of the growing season as relative growth rate declined, but treatment differences were minimal. Leaf nitrate reductase activity was consistently higher in fertilized trees before substantial leaf senescence had occurred. When leaf loss was evident, all treatments had high levels of nitrate reductase activity. Aspartic acid and glutamic acid were the most prevalent free amino acids in leaves, whereas concentrations of amine-rich amino acids were low. Although several nitrogen variables, including foliar asparagine and glycine concentrations, were positively correlated with relative growth rate (r greater-than-or-equal-to 0.7), no single variable closely reflected treatment differences in growth response. RP TSCHAPLINSKI, TJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Norby, Richard/C-1773-2012; OI Norby, Richard/0000-0002-0238-9828; Tschaplinski, Timothy/0000-0002-9540-6622 NR 24 TC 7 Z9 7 U1 0 U2 1 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4026 J9 CAN J BOT JI Can. J. Bot.-Rev. Can. Bot. PD JUN PY 1993 VL 71 IS 6 BP 841 EP 847 PG 7 WC Plant Sciences SC Plant Sciences GA LT794 UT WOS:A1993LT79400009 ER PT J AU THRING, RW CHORNET, E OVEREND, RP AF THRING, RW CHORNET, E OVEREND, RP TI FRACTIONATION OF WOODMEAL BY PREHYDROLYSIS AND THERMAL ORGANOSOLV - ALKALINE DEPOLYMERIZATION, CHEMICAL FUNCTIONALITY, AND MOLECULAR-WEIGHT DISTRIBUTION OF RECOVERED LIGNINS AND THEIR FRACTIONS SO CANADIAN JOURNAL OF CHEMISTRY LA English DT Article ID ANALYTICAL METHODOLOGY; BIOMASS PRETREATMENT; H-1-NMR SPECTROSCOPY; RESIDUES AB Thermal organosolv glycol lignins and their fractions have been characterized by means of elemental composition, molecular weight distribution, and H-1 and C-13 NMR spectroscopy. Fractionation of each lignin by sequential solvent extraction produced fractions of increasing molecular weight and polydispersity. Structures in the highest molecular weight fractions were found to be linked by a high proportion of beta-0-4 type bonds, whilst the lowest molecular weight fractions consisted of a high content of saturated aliphatic side-chain structures. A noticeable difference in the content of carbohydrate contaminants in both starting lignins indicated the formation of relatively stable lignin-carbohydrate complexes, especially in the lignin recovered from pretreated wood. In addition, depolymerization of the lignins and their fractions to monomeric compounds was explored using alkaline hydrolytic and nitrobenzene oxidative routes. The highest molecular weight fractions from each lignin were identified as the best candidates for production of useful monomeric phenolic compounds. C1 UNIV SHERBROOKE, DEPT CHEM ENGN, SHERBROOKE J1K 2R1, QUEBEC, CANADA. NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. NR 34 TC 8 Z9 8 U1 1 U2 5 PU CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS PI OTTAWA PA 65 AURIGA DR, SUITE 203, OTTAWA, ON K2E 7W6, CANADA SN 0008-4042 EI 1480-3291 J9 CAN J CHEM JI Can. J. Chem. PD JUN PY 1993 VL 71 IS 6 BP 779 EP 789 DI 10.1139/v93-103 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA LM299 UT WOS:A1993LM29900004 ER PT J AU COUTANT, CC CHEN, CH AF COUTANT, CC CHEN, CH TI STRONTIUM MICROSTRUCTURE IN SCALES OF FRESH-WATER AND ESTUARINE STRIPED BASS (MORONE-SAXATILIS) DETECTED BY LASER-ABLATION MASS-SPECTROMETRY SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID OTOLITH MICROCHEMISTRY; WATER AB A laser ablation microprobe with mass spectrometry was used to examine the variability of Sr concentration among and within scales of striped bass (Morone saxatilis). These exploratory studies demonstrated that the technique is capable of showing differences that we relate to environmental conditions. There were marked differences in scale Sr concentrations at high spatial resolution between striped bass from freshwater reservoirs in Tennessee (low Sr) and the Roanoke River - Albemarle Sound estuary system in North Carolina (high Sr). A peak in Sr concentration was found near the scale focus of striped bass collected in the freshwater Roanoke River (but not in scales from reservoir fish) that may identify saltwater parentage or estuarine rearing. In fish from the Roanoke River and Albemarle Sound, we observed spatial variations across annuli that might reflect movements between fresh and saline water. There was a typical Sr profile with depth through the estuarine scales that exhibited a peak of unresolved significance near the inside surface. Laser ablation mass spectrometry of Sr in fish scales appears to be a valuable technique for life history analyses. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37830. RP COUTANT, CC (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37830, USA. NR 18 TC 53 Z9 53 U1 0 U2 11 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD JUN PY 1993 VL 50 IS 6 BP 1318 EP 1323 DI 10.1139/f93-149 PG 6 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA LV417 UT WOS:A1993LV41700022 ER PT J AU EBY, RK JANECZEK, J EWING, RC ERCIT, TS GROAT, LA CHAKOUMAKOS, BC HAWTHORNE, FC ROSSMAN, GR AF EBY, RK JANECZEK, J EWING, RC ERCIT, TS GROAT, LA CHAKOUMAKOS, BC HAWTHORNE, FC ROSSMAN, GR TI METAMICT AND CHEMICALLY ALTERED VESUVIANITE SO CANADIAN MINERALOGIST LA English DT Article DE VESUVIANITE; METAMICT; RADIATION DAMAGE; ALTERATION; TRANSMISSION ELECTRON MICROSCOPY; BACKSCATTERED ELECTRON IMAGING; INFRARED SPECTROSCOPY; THERMOGRAVIMETRIC ANALYSIS ID RADIATION-DAMAGE; TITANITE; ZIRCON; QUARTZ AB Partly metamict vesuvianite samples from two localities were examined and compared. The unit cell of one is enlarged owing to volume expansion caused by the buildup of radiation damage. The other sample sustained enough damage to exclude accurate determination of unit-cell parameters. BSE imaging shows that both samples have undergone chemical alteration, and electron-microprobe data indicate that the alteration has resulted in a heterogeneous distribution of radionuclides on the micrometer scale. HRTEM and SAED analyses reveal a wide variation in the extent of alpha-recoil damage, which corresponds to the heterogeneous distribution of the radionuclides. The progressive stages of metamictization also are observed in detail with TEM. Partly metamict vesuvianite recrystallizes over the range 600-850-degrees-C, which is broader than the range found in other metamict silicates. Combined thermogravimetric analysis and isothermal annealing show that, upon heating (in N2 or Ar), metamict vesuvianite begins to recrystallize at 600-degrees-C, and at 900-degrees-C decomposes into the multiphase assemblage grossular + gehlenite + wollastonite. Unpolarized IR spectra of both vesuvianite samples are similar and also resemble those of radiation-damaged zircon and titanite, suggesting that the major structural features of the aperiodic state are similar for complex ceramics of different composition. C1 UNIV NEW MEXICO,DEPT GEOL,ALBUQUERQUE,NM 87131. CANADIAN MUSEUM NAT,MINERAL SCI SECT,OTTAWA K1P 6P4,ON,CANADA. UNIV BRITISH COLUMBIA,DEPT GEOL SCI,VANCOUVER V6T 2B4,BC,CANADA. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV MANITOBA,DEPT GEOL SCI,WINNIPEG R3T 2N2,MANITOBA,CANADA. CALTECH,DIV GEOL SCI,PASADENA,CA 91125. RI Hawthorne, Frank/F-6864-2011; Chakoumakos, Bryan/A-5601-2016 OI Hawthorne, Frank/0000-0001-6405-9931; Chakoumakos, Bryan/0000-0002-7870-6543 NR 20 TC 11 Z9 11 U1 0 U2 3 PU MINERALOGICAL ASSOC CANADA PI NEPEAN PA CITYVIEW 78087, NEPEAN ON K2G 5W2, CANADA SN 0008-4476 J9 CAN MINERAL JI Can. Mineral. PD JUN PY 1993 VL 31 BP 357 EP 369 PN 2 PG 13 WC Mineralogy SC Mineralogy GA LR474 UT WOS:A1993LR47400009 ER PT J AU JANKOWIAK, R HAYES, JM SMALL, GJ AF JANKOWIAK, R HAYES, JM SMALL, GJ TI SPECTRAL HOLE-BURNING SPECTROSCOPY IN AMORPHOUS MOLECULAR-SOLIDS AND PROTEINS SO CHEMICAL REVIEWS LA English DT Review ID PHOTOSYNTHETIC REACTION CENTERS; SINGLE PENTACENE MOLECULES; BACTERIAL REACTION CENTERS; ENERGY-TRANSFER DYNAMICS; PARA-TERPHENYL CRYSTAL; LOW-TEMPERATURE GLASS; ELECTRON-DONOR STATE; FREE-BASE PORPHIN; RESOLUTION OPTICAL SPECTROSCOPY; B800-850 ANTENNA COMPLEX C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 286 TC 204 Z9 205 U1 2 U2 16 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2665 J9 CHEM REV JI Chem. Rev. PD JUN PY 1993 VL 93 IS 4 BP 1471 EP 1502 DI 10.1021/cr00020a005 PG 32 WC Chemistry, Multidisciplinary SC Chemistry GA LJ047 UT WOS:A1993LJ04700005 ER PT J AU MARQUEZ, LN KELLER, SW STACY, AM FENDORF, M GRONSKY, R AF MARQUEZ, LN KELLER, SW STACY, AM FENDORF, M GRONSKY, R TI SYNTHESIS OF TWIN-FREE, ORTHORHOMBIC EUBA2CU3O7-PARTIAL-DERIVATIVE SUPERCONDUCTORS AT 450-DEGREES-C BY DIRECT PRECIPITATION FROM MOLTEN NAOH AND KOH SO CHEMISTRY OF MATERIALS LA English DT Note C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 20 TC 17 Z9 17 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUN PY 1993 VL 5 IS 6 BP 761 EP 764 DI 10.1021/cm00030a007 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LJ153 UT WOS:A1993LJ15300007 ER PT J AU ELLSWORTH, MW NOVAK, BM AF ELLSWORTH, MW NOVAK, BM TI INVERSE ORGANIC-INORGANIC COMPOSITE-MATERIALS .3. HIGH GLASS CONTENT NONSHRINKING SOL-GEL COMPOSITES VIA POLY(SILICIC ACID-ESTERS) SO CHEMISTRY OF MATERIALS LA English DT Article ID STRUCTURE PROPERTY BEHAVIOR; POLY(TETRAMETHYLENE OXIDE); HIGH-PRESSURE; SILICIC-ACID; KINETICS; NMR; TETRAETHOXYSILANE; PARTICLES; POLYMERS; ROUTES AB A critical challenge in the design of inorganic-organic composites is control over the mixing between the two chemically dissimilar phases. The sol-gel process has been utilized for the homogeneous incorporation of organic polymers into an inorganic matrix. One major limitation in the synthesis of sol-gel composites is the ubiquitous shrinkage that results from the evaporation of excess solvents and water. In our research, we have attempted to address this issue by developing in situ synchronous polymerization routes into these hybrid materials through the use of tetraalkoxysilanes possessing polymerizable alkoxides. Since our initial reports on the use of these new sol-gel precursors for the production of nonshrinking sol-gel composites, we have focused our efforts toward the synthesis and application of poly(silicic acid esters) bearing the same polymerizable alkoxides. This new approach allows for the synthesis of nonshrinking sol-gel composites with higher glass content than was previously possible with the tetraalkoxysilane derivatives. Furthermore, the use of poly(silicic acid esters) provides a new means for controlling composite morphology through the size and shape of the poly(silicic acid ester). Molecular weights for these poly(silicic acid esters) can be varied from 3000 to 30 000 simply by increasing the reaction time of the silicic acid synthesis. Also, particle shape can be controlled by the pH of the reaction solution. A modified esterification process using THF or benzene for azeotropic removal of water has been developed for synthesizing poly(silicic acid esters) with thermally unstable unsaturated alcohols. These substituted poly(silicic esters) have been used to produce transparent nonshrinking composites with a wide range of glass/polymer ratios. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. NR 66 TC 88 Z9 93 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUN PY 1993 VL 5 IS 6 BP 839 EP 844 DI 10.1021/cm00030a020 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LJ153 UT WOS:A1993LJ15300020 ER PT J AU MACKAY, R FRANZEN, HF AF MACKAY, R FRANZEN, HF TI ZR6NI6TISIOX - A NEW STRUCTURE TYPE WITH A MIXED EARLY LATE TRANSITION-METAL FRAMEWORK SO CHEMISTRY OF MATERIALS LA English DT Article ID ZR-NI SYSTEMS; KAPPA-PHASES AB An interstitially stabilized intermetallic in a mixed early-late transition-metal system has been found to crystallize in a new structure type. The new compound Zr6Ni6TiSiOx (x = 1.8) was synthesized by melting Zr, Ni, Si, and Ti2O3 in an arc furnace, followed by annealing in vacuum at 900-1150-degrees-C. The crystal structure was determined by refinement of single-crystal X-ray diffraction data. The structure was refined in the centrosymmetric space group P3m1BAR, Z = 2, with lattice parameters a = b = 8.2778(9) angstrom, and c = 7.444(1) angstrom (R = 0.030, R(w) = 0.033). Oxygen atoms center zirconium trigonal antiprisms, which share faces to form a three-dimensional network. The titanium and silicon atoms are coordinated by icosahedra of nickel or of zirconium and nickel atoms. A structural comparison with the kappa-phase will be discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 21 TC 2 Z9 2 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUN PY 1993 VL 5 IS 6 BP 857 EP 860 DI 10.1021/cm00030a023 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LJ153 UT WOS:A1993LJ15300023 ER PT J AU RUTH, LA AF RUTH, LA TI THERE IS COAL IN OUR FUTURE SO CHEMTECH LA English DT Article RP RUTH, LA (reprint author), US DOE,PITTSBURG ENERGY TECHNOL CTR,DIV COAL UTILIZAT,POB 10940,PITTSBURGH,PA 15236, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2703 J9 CHEMTECH JI Chemtech PD JUN PY 1993 VL 23 IS 6 BP 33 EP 39 PG 7 WC Chemistry, Applied SC Chemistry GA LJ698 UT WOS:A1993LJ69800012 ER PT J AU BAYDAR, N BROOKSGUNN, J FURSTENBERG, FF AF BAYDAR, N BROOKSGUNN, J FURSTENBERG, FF TI EARLY WARNING SIGNS OF FUNCTIONAL ILLITERACY - PREDICTORS IN CHILDHOOD AND ADOLESCENCE SO CHILD DEVELOPMENT LA English DT Article ID BIRTH-ORDER; CHILDREN; TIME; WORK AB Early childhood, middle childhood, and early adolescence determinants of functional literacy in adulthood are investigated, using 20-year longitudinal data from a sample of black children of teenaged mothers from the Baltimore metropolitan area. Document literacy was assessed by a test that consisted of a subset of items of the National Assessment of Educational Progress (NAEP) adult literacy test. The Baltimore sample is compared to the NAEP sample. Family environmental factors, early childhood developmental level, and educational career factors were considered as predictors of young adulthood literacy. Preschool cognitive and behavioral functioning is highly predictive of literacy in young adulthood, even when the effects of family environmental characteristics, including living arrangements, the quality of the home environment, maternal education, and income, are controlled. Grade failure in elementary school is also associated with literacy, but this effect disappears when the measure of preschool abilities is controlled. Family environmental factors that are predictive of literacy include maternal education, family size in early childhood, maternal marital status, and income in middle childhood and early adolescence. Policy implications of these findings are discussed. C1 COLUMBIA UNIV,NEW YORK,NY 10027. RP BAYDAR, N (reprint author), BATTELLE SEATTLE RES CTR,4000 NE 41ST ST,SEATTLE,WA 98105, USA. NR 61 TC 98 Z9 100 U1 1 U2 14 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0009-3920 J9 CHILD DEV JI Child Dev. PD JUN PY 1993 VL 64 IS 3 BP 815 EP 829 PG 15 WC Psychology, Educational; Psychology, Developmental SC Psychology GA LJ941 UT WOS:A1993LJ94100013 PM 8339697 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI MAKING SENSE OF SURFACE-STRUCTURE SO CHINESE JOURNAL OF PHYSICS LA English DT Article ID DIFFUSION; MICROSCOPE; FORCE; CORE AB First-principles calculations and corresponding experimental results underline the importance of basic chemical concepts in understanding the systematics of bonding and diffusion of atoms on metal surfaces. Examples discussed include surface step structure, adsorption and diffusion near surface steps and substitutional surface diffusion processes. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,DEPT SURFACE & INTERFACE SCI,ALBUQUERQUE,NM 87185, USA. NR 16 TC 0 Z9 0 U1 0 U2 1 PU PHYSICAL SOC REPUBLIC CHINA PI TAIPEI PA CHINESE JOURNAL PHYSICS PO BOX 23-30, TAIPEI 10764, TAIWAN SN 0577-9073 J9 CHINESE J PHYS JI Chin. J. Phys. PD JUN PY 1993 VL 31 IS 3 BP 441 EP 444 PG 4 WC Physics, Multidisciplinary SC Physics GA LG016 UT WOS:A1993LG01600010 ER PT J AU BISH, DL JOHNSTON, CT AF BISH, DL JOHNSTON, CT TI RIETVELD REFINEMENT AND FOURIER-TRANSFORM INFRARED SPECTROSCOPIC STUDY OF THE DICKITE STRUCTURE AT LOW-TEMPERATURE SO CLAYS AND CLAY MINERALS LA English DT Article DE DICKITE; FTIR; INFRARED SPECTROSCOPY; LOW TEMPERATURE; NEUTRON POWDER DIFFRACTION; RIETVELD REFINEMENT ID DIFFRACTION; ORIENTATION; KAOLINITE; NACRITE; OH AB The full structure of dickite from St. Claire, Pennsylvania, including hydrogen atoms, was refined in space group Cc using time-of-flight neutron powder diffraction data obtained at 12 K and Rietveld refinement/difference-Fourier methods (R(wp) = 2.62%, reduced chi2 = 1.915, 113 variables, a = 5.1474(6)angstrom, b = 8.9386(10)angstrom, c = 14.390(2)angstrom, and beta = 96.483(1)degrees). The non-hydrogen structure is essentially identical to published structures for dickite, but the hydrogen positions are distinct. The inner hydroxyl group is approximately parallel to the (001) plane, inclined by 1.3-degrees towards the tetrahedral sheet. Contrary to published low-temperature infrared (IR) Spectra, there is no evidence that dickite possess lower symmetry at low temperatures although there is tentative evidence for statistical occupancy of H3 on more than one site. Low-temperature IR spectra of St. Claire and Wisconsin dickites do not show evidence for more than four hydroxyl groups and are consistent with the reported structure. Upon cooling from 300 to 15 K, the position of the OH3 stretching band increased from 3710 to 3731 cm-1. This large, positive shift in frequency was attributed to the increase in the internuclear O-H3...O distance upon cooling. The frequency of the 3655 cm-1 band initially decreased by 2 cm-1 to 3653 cm-1 upon cooling from 300-125 K; however, the band increased in frequency by 1 cm-1 upon further cooling to 15 K. This unusual change in frequency upon cooling is consistent with the assignment of this band to OH2 and OH4. The position of the OH1 stretching band decreased from 3622 to 3620 cm-1 upon cooling, which was attributed, in part, to the observed increase in the Al-O(H1)-Al angle at low temperature. C1 UNIV FLORIDA,DEPT SOIL SCI,GAINESVILLE,FL 32611. RP BISH, DL (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545, USA. RI Johnston, Cliff/B-2215-2009 OI Johnston, Cliff/0000-0002-8462-9724 NR 25 TC 49 Z9 49 U1 1 U2 4 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD JUN PY 1993 VL 41 IS 3 BP 297 EP 304 DI 10.1346/CCMN.1993.0410304 PG 8 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA MC293 UT WOS:A1993MC29300004 ER PT J AU ROSENBERG, NJ AF ROSENBERG, NJ TI A METHODOLOGY CALLED MINK FOR STUDY OF CLIMATE-CHANGE IMPACTS AND RESPONSES ON THE REGIONAL-SCALE - AN INTRODUCTORY EDITORIAL SO CLIMATIC CHANGE LA English DT Editorial Material ID CIRCULATION RP ROSENBERG, NJ (reprint author), PACIFIC NW LAB, WASHINGTON, DC 20024 USA. NR 4 TC 38 Z9 38 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD JUN PY 1993 VL 24 IS 1-2 BP 1 EP 6 DI 10.1007/BF01091474 PG 6 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LR185 UT WOS:A1993LR18500001 ER EF