Abstract
Using -ray observations made by the Solar Maximum Mission Gamma Ray Spectrometer in the energy range 4.1-6.4 MeV we limit the possible radiative decays of neutrinos and axions emitted by SN 1987A. For neutrinos less massive than about 20 eV our constraint is sec/eV; for masses between 20 and 100 eV, sec; and for masses between 100 eV and a few MeV, sec eV. Here is the branching ratio for the radiative decay mode and is yet to be determined from the data, but should be of order unity. The axion mass limit is eV.
- Received 24 December 1987
DOI:https://doi.org/10.1103/PhysRevLett.62.509
©1989 American Physical Society