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We consider reactions of the typewhere B and B' are the initial and final baryons, l is either an electron or a muon and v t is the corresponding neutrino.The four-momenta and masses of these particles are p, M; p', M'; p,, rnz; pv, O, respectively. The formulae and tabulated values used to compute the theoretical decay rates are taken from BENDER, LINKE and ROTHE 1. * Work supported in part by the Bundesministerium f/Jr Wissenschaftliche Forschung.

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Approximately 106 S -+ decays of the stopping K-film (80 cm Saclay HBC)have been measured with the Heidelberg KONRAD-system ~. This system is capable of detecting about 75 % of the Z~----~ ne-7 decays. In addition, about 106 pictures have been scanned for X -+ leptonic decays with secondary particle momenta below 80 MeV/c. This covers about 15 % of the lepton spectrum. The data yield the following branching ratios: