Abstract
The muon momentum spectrum in K/sub mu2/ decay has been measured by using a high-resolution magnetic spectrograph to look for a discrete muon peak associated with heavy-neutrino emission. The spectrum revealed no distinct peak, and the upper bound of the mixing ratio between the muon neutrino and a massive neutrino has been determined to be 10/sup -4/--10/sup -6/ in the mass range of 70--300 MeV/c/sup 2/.
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