SLAC-PUB-2967 Erratum October 1982 (T/E) SEARCHING FOR HEAVY UNSTABLE NEUTRINOS'

If a heavy (r) neutrino exists with a mass between a few MeV and a few hundred MeV, neutrino beams will exhibit the phenomena of decay into well defined final states such as e-e+" e' evv, 7re. We demonstrate the feasibility of the decay signals and their high sensitivity to neutrino mixing parameters as small as 10 -3 in low energy neutrino experiments. We suggest a new type of neutrino decay experiments to search for these decays. (Submitted to Physical Review Letters) Jx Work supported in part by the Department of Energy, contract number DE-AC03-76SF00515. t Permanent address: Physics Department, Technion, Haifa, Israel.