Upper limit on the mass of the electron neutrino


The historic detection by the Kamiokande-II collaboration1 and the IMB collaboration2 of neutrinos from the Large Magellanic Cloud (LMC) supernova provides the first opportunity to determine the mass, m v c , of the electron neutrino from astronomical observations. Here we show that m v c , is less than 11 eV, provided only that propagation effects have not conspired to sharpen, by more than a factor of two the narrow pulse-width of neutrinos, observed by the Kamiokande-II collaboration from the LMC supernova. This result improves on the laboratory limit on m v c and confirms the view that electron neutrinos do not constitute the major component of the matter density of the Universe.

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