Super-Kamiokande's observation of neutrino mass also showed they were too light to be the primary component of dark matter. (kobe-u.ac.jp)
Since the rate of these decays depends on how massive neutrinos are, this would be a roundabout way of measuring neutrino masses, which has never been done. (newscientist.com)
Scientists have set theoretical limits on neutrino mass, but researchers have yet to precisely detect it. (sciencedaily.com)