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The probability of prompt and delayed fission of muonic237Np

  • Nuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

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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Author notes

  1. W. Schrieder

    Present address: Gesellschaft für Prozeßsteuerungs- und Informationssysteme mbH, W-8750, Aschaffenburg, Federal Republic of Germany

  2. H. Hänscheid

    Present address: Klinik und Poliklinik für Nuklearmedizin der Universität Würzburg, W-8700, Würzburg, Federal Republic of Germany

  3. F. Risse

    Present address: Bayer AG, W-5090, Leverkusen, Federal Republic of Germany

Authors and Affiliations

  1. Institut für Strahlen- und Kernphysik, Universität Bonn, W-5300, Bonn, Federal Republic of Germany

    W. Schrieder, P. David, H. Hänscheid, H. Paganetti, F. Risse & Ch. Rösel

  2. NIKHEF-K, P.O.Box 41882, 1009, DB Amsterdam, The Netherlands

    J. Konijn, C. T. A. M. de Laat & A. Taal

  3. Physics Laboratory, University of Utrecht, P.O.Box 80000, 3508, TA Utrecht, The Netherlands

    C. T. A. M. de Laat & A. Taal

  4. Paul-Scherrer-Institut (PSI), CH-5234, Villigen, Switzerland

    C. Petitjean & H. W. Reist

  5. Institut de Physique, Université de Fribourg, CH-1700, Fribourg, Switzerland

    L. A. Schaller & L. Schellenberg

  6. Nuclear Science Centre, Jawaharlal Nehru University, P.O.Box 10502, 110067, New Delhi, India

    A. K. Sinha

  7. Institut für Kernchemie, Universität Mainz, W-6500, Mainz, Federal Republic of Germany

    N. Trautmann

Authors
  1. W. Schrieder
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  2. P. David
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  3. H. Hänscheid
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  4. J. Konijn
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  5. C. T. A. M. de Laat
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  10. Ch. Rösel
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  11. L. A. Schaller
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  14. A. Taal
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Additional information

It is a pleasure to thank Professor T. Mayer-Kuckuk for his co-operation in performing the project. We gratefully acknowledge the permanent support of Professor J.P. Blaser and his staff at PSI. We are thankful to Professor S. Polikanov (GSI) and to Dr. T. Krogulski (University of Warsaw, Bialystok) for intensive and fruitful discussions. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06BN271 (WS, PD, HH, HP, FR, ChR, AKS). We thank the following institutions and organizations for financial support: Foundation for Fundamental Research on Matter (FOM), the Netherlands Organisation of the Advancement of Pure Research (NWO) (JK, CdL, AT), the Swiss National Foundation (SNF) (LAS, LS), and Alexander-von-Humboldt-Foundation (AvH) (AKS).

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Schrieder, W., David, P., Hänscheid, H. et al. The probability of prompt and delayed fission of muonic237Np. Z. Physik A - Hadrons and Nuclei 339, 445–451 (1991). https://doi.org/10.1007/BF01288428

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  • DOI: https://doi.org/10.1007/BF01288428

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