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The probability of prompt and delayed fission of muonic237Np |
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| Authors: | W. Schrieder P. David H. Hänscheid J. Konijn C. T. A. M. de Laat H. Paganetti C. Petitjean H. W. Reist F. Risse Ch. Rösel L. A. Schaller L. Schellenberg A. K. Sinha A. Taal N. Trautmann |
| Affiliation: | 1. Institut für Strahlen- und Kernphysik, Universit?t Bonn, W-5300, Bonn, Federal Republic of Germany 4. NIKHEF-K, P.O.Box 41882, 1009, DB Amsterdam, The Netherlands 5. Physics Laboratory, University of Utrecht, P.O.Box 80000, 3508, TA Utrecht, The Netherlands 6. Paul-Scherrer-Institut (PSI), CH-5234, Villigen, Switzerland 8. Institut de Physique, Université de Fribourg, CH-1700, Fribourg, Switzerland 9. Nuclear Science Centre, Jawaharlal Nehru University, P.O.Box 10502, 110067, New Delhi, India 10. Institut für Kernchemie, Universit?t Mainz, W-6500, Mainz, Federal Republic of Germany |
| Abstract: | Fission fragments from the reaction237Np(μ ?,γ,f) have been measured in coincidence with muonic X-rays. The efficiency of the fission fragment detector is determined from (μ ?,γ,f)-data of the same experiment. The total fission probability perμ-stopP t has been measured as well as the fission probabilities Pf of the non-radiative muonic (3d→1s)- and (2p→1s)-transitions; the latter has been divided into two parts leading to different mean excitation energiesE:P t =(54±17)%,P f (3d→1s)=(41±21)%,P f (2p→1s,E=6.218 MeV)=(61±19)%, andP f (2p→1s,E=6.525 MeV)=(57±18)%. The influence of the muon on the fission barrier is discussed. The fission probability after muon capture is compared with a calculated value using a distribution of nuclear excitation energies following muon capture and the fission probability as measured in a238U(3He,αf)-reaction. |
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