Six years ago, John Simpson at the University of Guelph in Ontario reported a rather disquieting discovery. In the beta decay of tritium, he asserted, a small fraction of decay events appear to produce a neutrino weighing 17 keV. That's the mass of the electron—very much larger than anyone was looking for in the many attempts to find evidence for a nonvanishing neutrino mass in the end point of the electron energy spectrum from tritium decay.
Bertram Schwarzschild; Four of Five New Experiments Claim Evidence For 17‐keV Neutrinos. Physics Today 1 May 1991; 44 (5): 17–19. https://doi.org/10.1063/1.2810104
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