Abstract
We set limits on the mixing of heavy neutrinos into the muon family, Vertical BarU/sub mui/Vertical Bar/sup 2/, for neutrino masses in the range 30 to 70 MeV/c/sup 2/. Both the Michel parameter and the e/sup +/ spectrum are used. This complements limits from leptonic decays of pseudoscalar mesons. We also give indications of how current experiments can be used to improve these limits.
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