Abstract

The spectral emission of neutrinos from a plasma in nuclear statistical equilibrium (NSE) is investigated. Particular attention is paid to the possible emission of high-energy ($>10$ MeV) neutrinos or antineutrinos. A newly developed numerical approach for describing the abundances of nuclei in NSE is presented. Neutrino emission spectra, resulting from general Fuller-Fowler-Newman conditions, are analyzed. Regions of T-$\ensuremath{\rho}$-${Y}_{e}$ space favoring detectability are selected. The importance of critical ${Y}_{e}$ values with zero net rate of neutronization (${\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{Y}}_{e}$) is discussed. Results are provided for the processing of matter under conditions typical for thermonuclear and core-collapse supernovae, presupernova stars, and neutron star mergers.

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