Massive Dirac neutrinos and SN 1987A
- 29 June 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 68 (26) , 3834-3837
- https://doi.org/10.1103/physrevlett.68.3834
Abstract
The wrong-helicity states of a Dirac neutrino can provide an important cooling mechanism for young neutron stars. Based on numerical models of the early cooling of the neutron start associated with SN 1987A which self-consistently incorporate wrong-helicity neutrino emission, we argue that a Dirac neutrino of mass greater than 30 keV (25 keV if it is degenerate) leads to shortening of the neutrino burst that is inconsistent with the Irvine-Michigan-Brookhaven and Kamiokande II data. If pions are as abundant as nucleons in the cores of neutron stars, our limit improves to 15 keV.Keywords
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