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Radiative neutrino decays and scattering experiments

1989; American Physical Society; Volume: 39; Issue: 7 Linguagem: Inglês

10.1103/physrevd.39.2066

1538-4500

Georg G. Raffelt,

Astrophysics and Cosmic Phenomena

Existing measurements of the total \ensuremath{\nu}${\ifmmode\bar\else\textasciimacron\fi{}}_{e}$${e}^{\mathrm{\ensuremath{-}}}$ cross section yield a very restrictive limit on the radiative decay of electron neutrinos, ${\mathrm{\ensuremath{\tau}}}_{\ensuremath{\nu}\mathit{e}}$${\mathit{m}}_{\ensuremath{\nu}}$${\mathit{e}}^{3}$\ensuremath{\gtrsim}3\ifmmode\times\else\texttimes\fi{}${10}^{18}$ /sec ${\mathrm{eV}}^{3}$, which is even competitive with recent bounds from the nonobservation of \ensuremath{\gamma} rays from SN 1987A. Our bound is not valid if the neutrino electric and magnetic transition moments are exactly equal, a cancellation which can occur only if neutrinos are of Dirac type. This is a new example for the important differences in the electromagnetic properties of Dirac versus Majorana neutrinos.