Radiative stability of neutrinos of finite rest mass

Abstract

It is pointed out that the cores of massive stars reach temperatures of the order of 10 MeV during the gravitational collapse preceding supernova explosion so that the emission of neutrinos of mass ~1 MeV is not suppressed substantially. Consequently we feel that the limits on radiative lifetimes derived using astrophysical arguments (Τ₀/m_ν>10¹⁶ sec/eV) are still valid.