Abstract
The mean life times of negative muons bound to actinide nuclei have been measured by detecting the time difference between a stopped muon and the arrival of fragments from delayed fission after muon capture. The deduced capture ratesΛ c are 1.392(4)·107/s for237Np, 1.290(7)·107/s for242Pu and 1.240(7)·107/s for244Pu. The results are compared with published data for the fission and the neutron decay channels and for the electron decay of the bound muon. Including a former measurement ofΛ c for239Pu, an isotopic dependence of the muon capture rates in the Pu isotopes is clearly observed.
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It is a pleasure to thank Professor J.P. Blaser and his staff for their encouraging support and for the excellent working conditions at PSI. We are indebted to the following institutes or organizations for financial support: Delft University of Technology (Jd'AvE), Bundesministerium für Forschung und Technologie der Bundesrepublic Deutschland contract number 06 BN 271 (PD, HH, JH, HJ, TM-K, RvM, FR, CFGR, WS), the Swedish Natural Science Research Council (TJ, GT), Foundation for Fundamental Research on Matter (FOM) and the Netherlands Organization of the Advancement of Pure Research (ZWO), (JK, CTAMdL, AT), the University of Warsaw, Bialystok (TK) and the Schweizer Nationalfonds (CG, LAS, LS). We are grateful to Professor H. Schopper and Dr. A.M. Wetherell, CERN, for putting to our disposal a Hewlett Packward HP 1000 Computer during the first stage of this experiment.