The long baseline between the Earth and the Sun makes solar neutrinos an
excellent test beam for exploring possible neutrino decay. The signature of
such decay would be an energy-dependent distortion of the traditional survival
probability which can be fit for using well-developed and high precision
analysis methods. Here a model including neutrino decay is fit to all three
phases of $^8$B solar neutrino data taken by the Sudbury Neutrino Observatory.
This fit constrains the lifetime of neutrino mass state $
u_2$ to be
${>8.08 imes10^{-5}}$ s/eV at $90\%$ confidence. An analysis combining this
SNO result with those from other solar neutrino experiments results in a
combined limit for the lifetime of mass state $
u_2$ of ${>1.04 imes10^{-3}}$
s/eV at $99\%$ confidence.
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