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Title: Weak decay processes in pre-supernova core evolution within the gross theory

The beta decay and electron capture rates are of fundamental importance in the evolution of massive stars in a pre-supernova core. The beta decay process gives its contribution by emitting electrons in the plasma of the stellar core, thereby increasing pressure, which in turn increases the temperature. From the other side, the electron capture removes free electrons from the plasma of the star core contributing to the reduction of pressure and temperature. In this work we calculate the beta decay and electron capture rates in stellar conditions for 63 nuclei of relevance in the pre-supernova stage, employing Gross Theory as the nuclear model. We use the abundances calculated with the Saha equations in the hypothesis of nuclear statistical equilibrium to evaluate the time derivative of the fraction of electrons. Our results are compared with other evaluations available in the literature. They have shown to be one order less or equal than the calculated within other models. Our results indicate that these differences may influence the evolution of the star in the later stages of pre-supernova.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Departamento de Estudos Básicos e Instrumentais, Universidade Estadual do Sudoeste da Bahia, BA (Brazil)
  2. Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, BA (Brazil)
  3. Departamento de Física, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata (Argentina)
Publication Date:
OSTI Identifier:
22351508
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; BETA DECAY; COMPARATIVE EVALUATIONS; ELECTRON CAPTURE; EQUILIBRIUM; EVOLUTION; NUCLEAR MODELS; NUCLEOSYNTHESIS; PLASMA; REDUCTION; SAHA EQUATION; SIMULATION; SUPERNOVAE