Stellar weak interaction rates for intermediate-mass nuclei. II - A = 21 to A = 60

TLDR

Stellar weak interaction rates for intermediate‑mass nuclei are investigated to understand electron and positron emission, capture, and neutrino energy loss processes in stellar environments. The authors calculate these rates for 226 nuclei (A = 21–60) using measured nuclear level data, shell‑model estimates of Gamow‑Teller sum rules, collective resonance contributions, and neutron‑shell‑closure blocking effects. Published in The Astrophysical Journal (Jan 1982, DOI 10.1086/159597).

Abstract

view Abstract Citations (407) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar weak interaction rates for intermediate-mass nuclei. II - A = 21 to A = 60 Fuller, G. M. ; Fowler, W. A. ; Newman, M. J. Abstract Astrophysical electron and positron emission, continuum electron and positron capture rates, and associated neutrino energy loss rates are calculated for free nucleons and 226 nuclei with masses between A = 21 and 60. Where available, measured nuclear level information and matrix elements are used. Simple shell model arguments are used in estimating Gamow-Teller sum rules and collective state resonance excitation energies. The discrete state contribution to the rates, dominated by experimental information and the Fermi transitions, determines the nuclear rates in the regime of temperatures and densities that is characteristic of the hydrostatic phases of presupernova stellar evolution. At the higher temperatures and densities characteristic of the supernova collapse phase, the nuclear rates are dominated by the Gamow-Teller and Fermi collective resonance contributions. Also included is the effect of neutron shell closure blocking of electron capture on neutron-rich nuclei. Publication: The Astrophysical Journal Pub Date: January 1982 DOI: 10.1086/159597 Bibcode: 1982ApJ...252..715F Keywords: Neutrinos; Nuclear Reactions; Particle Emission; Stellar Evolution; Supernovae; Weak Energy Interactions; Electron Emission; Energy Dissipation; Equations Of State; Gravitational Collapse; Stellar Models; Stellar Structure; Astrophysics full text sources ADS |