Abstract
Mass yield and total kinetic energy release (TKE) distributions of fragments from prompt and delayed muon induced fission, separately, have been measured for the isotopes235U,238U,237Np and242Pu. The distributions from prompt muon induced fission are compared with the corresponding distributions from hadronic reactions and from spontaneous fission (s.f.). The distributions from the delayed muonic fission processes are compared to the distributions for neutron and proton-induced fission. No mass distributions measured in the prompt muonic fission process show any signature, which can be attributed to the presence of the muon. Differences observed between the TKE distributions of prompt muon induced and hadron induced fission can be explained by the screening effect of the negative charge of the muon bound in the orbit of one of the fission fragments. The observed yield of symmetric muon induced fission was found to be defined merely by the value of the excitation energy.
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It is a pleasure to thank Profess or J.P. Blaser and his staff for their encouraging support and for the excellent working conditions at SIN.
We are indebted to the following institutes or organizations for financial support:
Delft University of Technology (Jd'AvE); Bundesministerium für Forschung und Technologie der Bundesrepublik Deutschland, contract number 06BN271 (PD, JH, HJ, TM-K, RvM); the Swedish Natural Science Council (TJ, GT); Foundation for Fundamental Research on Matter (FOM) and the Netherlands Organization of the Advancement of Pure Research (ZWO) (JK, CdL, AT) and the University of Warsaw, Bialystok (TK).
We are grateful to Professor H. Schopper and Dr. A.M. Wetherell, CERN, for putting to our diposal a Hewlett Packard HP 1000 Computer during the first stage of this experiment.