排序方式: 共有40条查询结果,搜索用时 173 毫秒
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C.J. Martoff L. Van Elmbt M. Lebrun M. Schaad U. Straumann P. Truöl K.M. Crowe C. Joseph J.P. Perroud D. Ruegger M.T. Tran J. Deutsch G. Grégoire R. Prieels W. Dahme 《Nuclear Physics A》1984,430(3):557-572
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 . 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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T.M. Huber A. Adamczak J.M. Bailey G.A. Beer J.L. Beveridge B.P. Ellerbusch M.C. Fujiwara R. Jacot-Guillarmod P. Kammel S.K. Kim P.E. Knowles A.R. Kunselman G.J. Lindquist 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):159-161
In recent TRIUMF experiments, a μ- beam is stopped in a solid hydrogen film with a small fraction of T2. The Ramsauer-Townsend (RT) mechanism allows μt to escape into vacuum with a few eV of energy. To study the emission process, an imaging system was used to determine the
position of muon decays. Experimental histograms are in good agreement with a Monte Carlo simulation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Knowles P. E. Bailey J. M. Beer G. A. Beveridge J. L. Fujiwara M. C. Huber T. M. Jacot-Guillarmod R. Kammel P. Kim S. K. Kunselman A. R. Marshall G. M. Martoff C. J. Mason G. R. Mulhauser F. Olin A. Petitjean C. Porcelli T. A. Zmeskal J. 《Hyperfine Interactions》1996,(1):21-28
Muon-catalyzed fusion in deuterium has traditionally been studied in gaseous and liquid targets. The TRIUMF solid hydrogen layer target system has been used to study the fusion reaction rates in the solid phase at a target temperature of 3 K. Both branches of the cycle were observed; neutrons by a liquid organic scintillator, and protons by a silicon detector located inside the target system. The effective molecular formation rate from the upper hyperfine state and the spin exchange rate have been measured, and information on the branching ratio parameters has been extracted. 相似文献
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M.C. Fujiwara J.M. Bailey G.A. Beer J.L. Beveridge J.L. Douglas 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. Zmeskal 《Hyperfine Interactions》1997,106(1-4):257-264
The emission of muonic tritium atoms from a thin film of hydrogen isotopes into vacuum was observed. The time and position
of the muon decays were measured by tracking the decay electron trajectory. The observations are useful both for testing the
theoretical cross sections for muonic atomic interactions, and producing an atomic beam of slow μ-t with a controllable energy.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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C. J. Martoff D. Počanić L. W. Whitlow S. S. Hanna H. Ullrich S. Cierjacks M. Furić T. Petković H. J. Weyer 《Czechoslovak Journal of Physics》1986,36(3):378-382
Preliminary results of measurements of proton energy spectra and search for coincidentp, n pair emission following negative muon capture in12C,16O,27Al are given. A very clear signal for proton emission is found, which can be exploited in future detailed studies.Presented at the symposium Mesons and Light Nuclei, Bechyn, Czechoslovakia, May 27–June 1, 1985.This work was supported in part by the U.S. National Science Foundation, grant 83-10044-A 2, the German Bundesministerium für Forschung und Technologie, the International Buero Julich, and the Swiss National Science Foundation. 相似文献
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