排序方式: 共有40条查询结果,搜索用时 326 毫秒
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M.C. Fujiwara A. Adamczak J.M. Bailey G.A. Beer J.L. Beveridge M.P. Faifman T.M. Huber R. Jacot-Guillarmod P. Kammel S.K. Kim P.E. Knowles A.R. Kunselman M. Maier V.E. Markushin G.M. Marshall C.J. Martoff G.R. Mason F. Mulhauser A. Olin C. Petitjean T.A. Porcelli J. Woźniak J. Zmeskal 《Hyperfine Interactions》1999,118(1-4):151-157
Emission of muonic tritium from a solid hydrogen layer has been studied via imaging of the muon-decay electrons and the time-of-flight
distributions have been compared with detailed Monte Carlo calculations. Results are consistent at the 10% level with the
theoretical prediction of a Ramsauer-Townsend minimum cross-section energy.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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CJ Isham 《Contemporary Physics》2013,54(3):207-219
The paper contains a relatively non-technical summary of some recent work by the author and Jeremy Butterfield. The goal is to find a way of assigning meaningful truth values to propositions in quantum theory: something that is not possible in the normal, instrumentalist interpretation. The key mathematical tool is presheaf theory where multi-valued, contextual truth values arise naturally. We show how this can be applied to quantum theory, with the ‘contexts’ chosen to be Boolean subalgebras of the set of all projection operators. 相似文献
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Jacot-Guillarmod R. Bailey J. M. Beer G. A. Beveridge J. L. Fujiwara M. C. Huber T. M. Kammel P. Knowles P. E. Kunselman A. R. Marshall G. M. Martoff C. J. Mason G. R. Mulhauser F. Olin A. Petitjean C. Woźniak J. Zmeskal J. 《Hyperfine Interactions》1996,101(1):239-248
In an experiment at TRIUMF to study muon-catalyzed fusion and associated atomic and molecular effects, negative muons were stopped in a solid protium hydrogen layer containing a small amount of deuterium. Most of the resulting µp atoms disappeared by formation of ppµ molecules or by muon transfer to a deuteron. The µd can drift almost freely through the hydrogen layer due to the Ramsauer-Townsend effect and may even leave the layer. If a thin neon layer is frozen atop the hydrogen, the exiting muonic atoms will very rapidly release their muon to a neon atom. The analysis of the time structure of the neon X-rays is used to determine the rates of the slower processes involved in the evolution of the µp. This analysis has been performed with the help of Monte Carlo calculations, which simulate the kinetics of both µp and µd atoms in the hydrogen mixtures. 相似文献
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Miyoshi T Sarsour M Yuan L Zhu X Ahmidouch A Ambrozewicz P Androic D Angelescu T Asaturyan R Avery S Baker OK Bertovic I Breuer H Carlini R Cha J Chrien R Christy M Cole L Danagoulian S Dehnhard D Elaasar M Empl A Ent R Fenker H Fujii Y Furic M Gan L Garrow K Gasparian A Gueye P Harvey M Hashimoto O Hinton W Hu B Hungerford E Jackson C Johnston K Juengst H Keppel C Lan K Liang Y Likhachev VP Liu JH Mack D Margaryan A Markowitz P Martoff J Mkrtchyan H Nakamura SN Petkovic T Reinhold J Roche J 《Physical review letters》2003,90(23):232502
High-energy, cw electron beams at new accelerator facilities allow electromagnetic production and precision study of hypernuclear structure, and we report here on the first experiment demonstrating the potential of the (e,e'K+) reaction for hypernuclear spectroscopy. This experiment is also the first to take advantage of the enhanced virtual photon flux available when electrons are scattered at approximately zero degrees. The observed energy resolution was found to be approximately 900 keV for the (12)(Lambda)B spectrum, and is substantially better than any previous hypernuclear experiment using magnetic spectrometers. The positions of the major excitations are found to be in agreement with a theoretical prediction and with a previous binding energy measurement, but additional structure is also observed in the core excited region, underlining the future promise of this technique. 相似文献
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The cross section and angular distribution for the reaction 13C(π+, γ)13N(g.s.) have been measured from 37 to 85° in the laboratory, at a pion energy of 115.5 MeV. The observed cross section ranges from 320 to 660 nb/sr. These results do not show the large magnitude and wide-angle peaking expected if pre-critical effects due to nascent pion condensation were present. In addition, the observed cross section is less than one-half of the predictions of available theoretical calculations which do not include the pre-critical effect. Data on the reaction 1H(π−, γ)n at Tπ = 116.6 MeV were also obtained for calibration purposes. These data agree with expectations based on knowledge of the inverse reaction and previous measurements. 相似文献
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Fujiwara MC Adamczak A Bailey JM Beer GA Beveridge JL Faifman MP Huber TM Kammel P Kim SK Knowles PE Kunselman AR Maier M Markushin VE Marshall GM Martoff CJ Mason GR Mulhauser F Olin A Petitjean C Porcelli TA Wozniak J Zmeskal J 《Physical review letters》2000,85(8):1642-1645
Resonant formation of d&mgr;t molecules in collisions of muonic tritium ( &mgr;t) on D2 was investigated using a beam of &mgr;t atoms, demonstrating a new direct approach in muon catalyzed fusion studies. Strong epithermal resonances in d&mgr;t formation were directly revealed for the first time. From the time-of-flight analysis of 2036+/-116 dt fusion events, a formation rate consistent with 0.73+/-(0.16)(meas)+/-(0.09)(model) times the theoretical prediction was obtained. For the largest peak at a resonance energy of 0.423+/-0.037 eV, this corresponds to a rate of (7.1+/-1.8)x10(9) s(-1), more than an order of magnitude larger than those at low energies. 相似文献
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Time-resolved local induction measurements near the vortex lattice order-disorder transition in optimally doped Bi(2)Sr(2)CaCu(2)O(8+delta) crystals show that the high-field, disordered phase can be quenched to fields as low as half the transition field. Over an important range of fields, the electrodynamical behavior of the vortex system is governed by the coexistence of ordered and disordered vortex phases in the sample. We interpret the results as supercooling of the high-field phase and the possible first-order nature of the order-disorder transition at the "second magnetization peak." 相似文献