Stability of the Neutrino

Limits of g ${10}^{5}$ astronomical units are set on the decay length of an electron antineutrino ${\overline{\ensuremath{\nu}}}_{e}$ via the process ${\overline{\ensuremath{\nu}}}_{e}\ensuremath{\rightarrow}{\ensuremath{\nu}}^{\ensuremath{'}}+\ensuremath{\gamma}$ for ${E}_{\ensuremath{\gamma}}$ in the range 0.1-0.5 MeV using the results from a well-shielded detector in the vicinity of a fission reactor. This mode of decay is therefore ruled out as a possible explanation for the paucity of solar neutrinos revealed by the experiment of Davis.