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- W1987954313 abstract "The familiar nucleosynthesis constraint on the number of neutrino species, ${mathit{N}}_{ensuremath{nu}}$ensuremath{le}3.4, applies to massless neutrino species. An MeV-mass neutrino can have even greater impact, and we show that primordial nucleosynthesis excludes a ensuremath{tau}-neutrino mass from 0.3 to 25 MeV (Dirac) and 0.5 to 25 MeV (Majorana) provided that its lifetime ${mathrm{ensuremath{tau}}}_{ensuremath{nu}}$ensuremath{gtrsim}1 sec, and from 0.3 to 30 MeV (Dirac) and 0.5 to 32 MeV (Majorana) for ${mathrm{ensuremath{tau}}}_{ensuremath{nu}}$ensuremath{gtrsim}${10}^{3}$ sec. A modest improvement in the laboratory mass limit---from 35 to 25 MeV---would imply that the ensuremath{tau}-neutrino mass must be less than 0.5 MeV (provided ${mathrm{ensuremath{tau}}}_{ensuremath{nu}}$ensuremath{gtrsim}1 sec)." @default.
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- W1987954313 date "1991-07-29" @default.
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- W1987954313 title "Constraints from primordial nucleosynthesis on the mass of the τ neutrino" @default.
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- W1987954313 doi "https://doi.org/10.1103/physrevlett.67.533" @default.
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