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排序方式: 共有160条查询结果,搜索用时 234 毫秒
81.
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Ackerbauer P. Jeitler M. Werner J. Breunlich W. H. Cargnelli M. Fussy S. Marton J. Scrinzi A. Zmeskal J. Bistirlich J. Crowe K. M. Kammel P. Kurck J. Petitjean C. Sherman R. H. Bossy H. Daniel H. Hartmann F. J. Neumann W. Schmidt G. 《Hyperfine Interactions》1996,101(1):67-80
A comprehensive experimental study of the kinetics of muon-catalyzed dt fusion has been conducted at PSI, based on the measurement of the 14 MeV neutrons from the fusion process. The target conditions included densities from 1–150% of the atomic density of liquid hydrogen, relative tritium concentrations of 2–95%, and temperatures of 13–300 K. Information about the dt cycle has been obtained from the measured neutron time distributions by different methods: Monte Carlo simulations primarily aimed at investigating epithermal effects in molecular formation and the determination and interpretation of cycling rates describing the steady state regime. 相似文献
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Klay JL Ajitanand NN Alexander JM Anderson MG Best D Brady FP Case T Caskey W Cebra D Chance JL Chung P Cole B Crowe K Das AC Draper JE Gilkes ML Gushue S Heffner M Hirsch AS Hjort EL Huo L Justice M Kaplan M Keane D Kintner JC Krofcheck D Lacey RA Lauret J Law C Lisa MA Liu H Liu YM McGrath R Milosevich Z Odyniec G Olson DL Panitkin SY Pinkenburg C Porile NT Rai G Ritter HG Romero JL Scharenberg R Schroeder L Srivastava B Stone NT Symons TJ Wang S Wells R Whitfield J Wienold T Witt R Wood L 《Physical review letters》2002,88(10):102301
Rapidity distributions of protons from central 197Au+197Au collisions measured by the E895 Collaboration in the energy range from (2-8)A GeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived using a thermal model including collective longitudinal expansion are extracted from these distributions. The results show an approximately linear increase in the longitudinal flow velocity, (L), as a function of the logarithm of beam energy. 相似文献
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K. Frankel W. Schimmerling J. O. Rasmussen K. M. Crowe J. Bistirlich H. Bowman O. Hashimoto D. L. Murphy J. Ridout J. P. Sullivan E. Yoo W. J. McDonald M. Salomon J. -S. Xu 《Zeitschrift für Physik A Hadrons and Nuclei》1986,323(4):391-398
We report a preliminary measurement of coincident neutron-proton pairs emitted at 45° in the interaction of 400, 530, and 650 MeV/A neon beams incident on uranium. Charged particles were identified by time of flight and momentum, as determined in a magnetic spectrometer. Neutral particles were detected using a thick plastic scintillator, and their time of flight was measured between an entrance scintillator, triggered by a charged particle, and the neutron detector. The scatter plots and contour plots of neutron momentum vs. proton momentum appear to show a slight correlation ridge above an uncorrelated background. The projections of this plane on then-p momentum difference axis are essentially flat, showing a one standard deviation enhancement for each of the three beams energies. At each beam energy, the calculated momentum correlation function for the neutron-proton pairs is enhanced near zero neutron-proton momentum difference by approximately one standard deviation over the expected value for no correlation. This enhancement is expected to occur as a consequence of the attractive final state interaction between the neutron and proton (i.e., virtual or “singlet” deuterons). The implications of these measurements are discussed. 相似文献
88.
J. H. Brewer M. Celio D. R. Harshman R. Keitel S. R. Kreitzman G. M. Luke D. R. Noakes R. E. Turner E. J. Ansaldo C. W. Clawson K. M. Crowe C. Y. Huang 《Hyperfine Interactions》1986,31(1-4):191-197
Muon spin relaxation in low (weak) longitudinal magnetic field (LLF-μSR) provides a means of independently determining the
static dipolar width Δ characterizing the μ+ lattice site and the correlation time τc for μ+ hopping, in a manner that is nearly model-independent for τc and especially accurate in the near-static limit (τc>τμ). The advantages of this method are illustrated by its application to muon hopping in Cu near the τc maximum around 50 K. 相似文献
89.
CNDO based molecular orbital calculations are reported for solid HF and compared with results from a recent structural determination. It is found that theoretical structure is not in good agreement with that observed experimentally at 4 K. 相似文献
90.
Lisa MA Ajitanand NN Alexander JM Anderson M Best D Brady FP Case T Caskey W Cebra D Chance JL Chung P Cole B Crowe K Das AC Draper JE Gilkes ML Gushue S Heffner M Hirsch AS Hjort EL Huo L Justice M Kaplan M Keane D Kintner JC Klay J 《Physical review letters》2000,84(13):2798-2802
We present the first excitation function of pi(-) intensity interferometry at Alternating Gradient Synchrotron (AGS) energies (2-8 A GeV). The sensitivity of the multidimensional correlation functions to the geometry and dynamics of the pion-emitting system provides a stringent test of transport models of heavy ion collisions. Detailed comparisons with a realistic transport model, both with and without an explicit nuclear mean field, suggest that the beam energy evolution in the reaction dynamics is different in the model than in the data. A significantly increased pi(-) emission time scale, which has been suggested as a signal of the onset of the transition to quark-gluon plasma, is not observed. 相似文献