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Heavy neutrinos were sought in pion decays $\pi^+ \rightarrow \mu^+ \nu$ byexamining the observed muon energy spectrum for extra peaks in addition to theexpected peak for a massless neutrino. No evidence for heavy neutrinos wasobserved. Upper limits were set on the neutrino mixing matrix $|U_{\mu i}|^2$in the neutrino mass region of 15.7--33.8 MeV/c$^2$, improving on previousresults by an order of magnitude.

Search for Heavy Neutrinos in $\pi \to \mu\nu$ Decay