排序方式: 共有72条查询结果,搜索用时 265 毫秒
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T. Case K. M. Crowe K. Lou C. Petitjean W. H. Breunlich M. Jeitler P. Kammel B. Lauss J. Marton W. Prymas J. Zmeskal D. V. Balin V. N. Baturin Yu. S. Grigoriev A. I. Ilyin E. M. Maev G. E. Petrov G. G. Semenchuk Yu. V. Smirenin A. A. Vorobyov N. I. Voropaev P. Baumann H. Daniel F. J. Hartmann M. Mühlbauer W. Schott P. Wojciechowski 《Hyperfine Interactions》1993,82(1-4):295-302
Starting in 1989 an experiment was run at PSI to directly measure the final sticking probability in muon catalyzed dt fusion. This experiment was based on an active-target ionization chamber (IC) built at Gatchina, Russia, and an array of plastic neutron counters. In three runs approximately 5×106 isolated alpha signals were recorded with around one half of these occurring in the inner chamber region where we have more complete understanding of the systematic errors. Particularly from a long run in 1992 we were able to obtain a very clean sticking peak of some 5000 events. However, to reach an accurate value of sticking, all systematic effects and several major backgrounds had to be understood in detail. To this end a Monte Carlo code was written to simulate the full electrostatic environment of the IC and to recreate completely each signal type including the actual tritium decay noise from the live experiment. A slightly model dependent value of approx. 0.56±0.04% is obtained for final sticking. 相似文献
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W. Schott V. N. Baturin W. H. Breunlich T. Case H. Daniel F. J. Hartmann M. Jeitler P. Kammel K. Lou E. M. Maev J. Marton M. Mühlbauer C. Petitjean G. E. Petrov Yu. V. Petrov G. G. Semenchuk Yu. V. Smirenin A. A. Vorobyov P. Wojciechowski J. Zmeskal 《Hyperfine Interactions》1993,82(1-4):471-481
The triton energy of the muon capture reaction 3He t+v, where 3 He is the ground state of muonic3He, has been measured in order to investigate a possible heavy v admixture into the flavour with high sensitivity. 3 He has been formed via the pd fusion reaction by stopping – in an ionization chamber (IC) filled with an H/D gas mixture of 3% D concentration at a pressure of 161 bar. In a first short experiment 650 triton events were observed yielding an upper limit for the -heavy v mixing strength of 2.3×10–3 atE
0v=60 MeV. 相似文献
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P. Ackerbauer W. H. Breunlich M. Fuchs S. Fussy M. Jeitler P. Kammel B. Lauss J. Marton W. Prymas J. Werner J. Zmeskal K. Lou C. Petitjean P. Baumann H. Daniel F. J. Hartmann W. Schott T. von Egidy P. Wojciechowski D. Chatellard J. P. Egger E. Jeannet T. Case K. M. Crowe R. H. Sherman V. Markushin 《Hyperfine Interactions》1993,82(1-4):243-258
Complementary to the investigations of the most efficient dt cycle, also the other muon-induced fusion cycles in mixtures of hydrogen isotopes have been studied. The results of these dedicated experiments provide rich information about muon-induced few-body reactions and contribute significantly to a better overall understanding of CF. A summary of the recent progress will be presented. Special emphasis will be put on two characteristic examples, namely a new experimental approach to study the muonic cascade in H-D mixtures and the systematic study of hyperfine effects in muon-induced reactions. 相似文献
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P. Ackerbauer J. Werner W. H. Breunlich M. Cargnelli M. Jeitler P. Kammel J. Marton N. Nägele A. Scrinzi J. Zmeskal J. Bistirlich K. M. Crowe C. Petitjean R. H. Sherman P. Baumann H. Bossy H. Daniel F. J. Hartmann W. Schott T. von Egidy W. Neumann 《Hyperfine Interactions》1993,82(1-4):357-372
A main source of information about the muon-catalyzed fusion cycle in D-T mixtures are the cycling rates c, which are characteristic for the kinetic equilibrium of states attained rapidly in dense targets. The measurement, analysis and interpretation of these rates will be discussed, concentrating on the extensive set of rates observed at PSI over the last decade in gaseous, liquid and solid targets.Invited talk presented by Peter Kammel. 相似文献
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Andreev VA Banks TI Case TA Chitwood DB Clayton SM Crowe KM Deutsch J Egger J Freedman SJ Ganzha VA Gorringe T Gray FE Hertzog DW Hildebrandt M Kammel P Kiburg B Knaack S Kravtsov PA Krivshich AG Lauss B Lynch KL Maev EM Maev OE Mulhauser F Ozben CS Petitjean C Petrov GE Prieels R Schapkin GN Semenchuk GG Soroka MA Tishchenko V Vasilyev AA Vorobyov AA Vznuzdaev ME Winter P;MuCap Collaboration 《Physical review letters》2007,99(3):032002
The rate of nuclear muon capture by the proton has been measured using a new technique based on a time projection chamber operating in ultraclean, deuterium-depleted hydrogen gas, which is key to avoiding uncertainties from muonic molecule formation. The capture rate from the hyperfine singlet ground state of the microp atom was obtained from the difference between the micro(-) disappearance rate in hydrogen and the world average for the micro(+) decay rate, yielding Lambda(S)=725.0+/-17.4 s(-1), from which the induced pseudoscalar coupling of the nucleon, g(P)(q(2)=-0.88m(2)(micro))=7.3+/-1.1, is extracted. 相似文献
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Porcelli TA Adamczak A Bailey JM Beer GA Douglas JL Faifman MP Fujiwara MC Huber TM Kammel P Kim SK Knowles PE Kunselman AR Maier M Markushin VE Marshall GM Mason GR Mulhauser F Olin A Petitjean C Zmeskal J;TRIUMF Muonic Hydrogen Collaboration 《Physical review letters》2001,86(17):3763-3766
Measurements of muon-catalyzed dt fusion ( d(mu)t-->4He + n + mu(-)) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction (mu)t + HD-->[(d(mu)t)pee](*) is compared to experimental results in a pure solid HD target. Constraints on the rates are inferred through the use of a Monte Carlo model developed specifically for the experiment. From the time-of-flight analysis of fusion events in 16 and 37 microg x cm(-2) targets, an average formation rate consistent with 0.897+/-(0.046)(stat)+/-(0.166)(syst) times the theoretical prediction was obtained. 相似文献
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D. V. Balin V. A. Ganzha S. M. Kozlov E. M. Maev G. E. Petrov M. A. Soroka G. N. Schapkin G. G. Semenchuk V. A. Trofimov A. A. Vasiliev A. A. Vorobyov N. I. Voropaev C. Petitjean B. Gartner B. Lauss J. Marton J. Zmeskal T. Case K. M. Crowe P. Kammel F. J. Hartmann M. P. Faifman 《Physics of Particles and Nuclei》2011,42(2):185-214
Muon catalyzed dd fusion in D2 and HD gases in the temperature range from 28 to 350 K was investigated in a series of experiments based on a time-projection ionization chamber operating with pure hydrogen. All main observables in this reaction chain were measured with high absolute precision including the resonant and non-resonant ddμ formation rates, the rate for hyperfine transitions in dμ atoms, the branching ratio of the two charge symmetric fusion channels 3He + n and t + p and the muon sticking probability. The report presents the final analysis of the data together with a comprehensive comparison with calculations based on recent μCF theories. The energy of the loosely bound ddμ state with quantum numbers J = 1, ν = 1, which is central to the mechanism of resonant molecule formation, is extracted with precision ?11(fit) = ?1.9651(7) eV. in impressive agreement with the latest theoretical results ?11(theory) = ?1.9646 eV. 相似文献
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Jacot-Guillarmod R. Adamczak A. Beer G. A. Bystritsky V. M. Czapliński W. Filipowicz M. Fujiwara M. C. Huber T. M. Kammel P. Knowles P. E. Kunselman A. R. Markushin V. E. Marshall G. M. Mulhauser F. Olin A. Petitjean C. Rivkis L. A. Stolupin V. A. Woźniak J. Zmeskal J. 《Hyperfine Interactions》1996,101(1):563-571
Hyperfine Interactions - Knowledge of the cross sections for scattering of µp, µd and µt on molecules of hydrogen isotopes is necessary not only for checking the algorithmic solution... 相似文献