Limits on the radiative decay of neutrinos

Cowsik, R. (1977) Limits on the radiative decay of neutrinos Physical Review Letters, 39 (13). pp. 784-787. ISSN 0031-9007

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Astronomical observations at the x-ray, optical, and radio frequencies are used to show that the lifetime of neutrinos for radiative decay divided by the rest mass, Τ0/mν, exceeds 1017 sec/eV. If one makes the further assumption that mν>10-3 eV, then Τ0>~1019 sec. If there are other competing decays of neutrinos, it is then shown that Γνee→x+γ)/Γνe(total)<~10-15 and Γνμμ→x+γ)/Γνμ(total)<~3×10-6.

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