S. E. Woosley investigated the electron fraction in stellar matter with A. Arcones, G. Martínez-Pinedo and L. F. Roberts. Their 2010 calculation combined nuclear statistical equilibrium with beta equilibrium conditions to constrain composition in presupernova and collapse environments.[ref]
Electron fraction constraints based on nuclear statistical equilibrium with beta equilibrium by A. Arcones and others. Abstract: equilibrium constraints and astrophysical tests
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