Abstract
We explore, mostly using data from solar neutrino experiments, the hypothesis that the neutrino mass eigenstates are unstable. We find that, by combining $^{8}\mathrm{B}$ solar neutrino data with those on $^{7}\mathrm{Be}$ and lower-energy solar neutrinos, one obtains a mostly model-independent bound on both the ${\ensuremath{\nu}}_{1}$ and ${\ensuremath{\nu}}_{2}$ lifetimes. We comment on whether a nonzero neutrino decay width can improve the compatibility of the solar neutrino data with the massive neutrino hypothesis.
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