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A simple form for the neutrino mass matrix describing νₑ, ν_μ, ν_τ, and a sterile state νₛ is proposed which accommodates the 17-keV neutrino as a ν_μ-ν_τ pseudo Dirac pair and simultaneously resolves the solar-neutrino puzzle via νₑ-νₛ Mikheyev-Smirnov-Wolfenstein (MSW) oscillation. This model, which is a specific realization of a scheme proposed recently by Caldwell and Langacker, is automatically free of all supernova constraints. It is shown that the mass matrix follows in a technically natural manner in extensions of the standard model with spontaneously broken global U(1)_Lₑ-L_μ×U(1)_L_τ symmetry. The 17-keV neutrino decays to νₑ and a Majoron with a lifetime of order 10^-1-10^-2 sec, thus satisfying all cosmological and astrophysical constraints.
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Babu et al. (1992) studied this question.
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