Abstract
In this work, electron-capture rates on nuclei for stellar conditions are calculated for Ni isotopes, using a self-consistent microscopic model based on the finite temperature Skyrme Hartree-Fock plus finite-temperature charge-exchange random phase approximation approach. The results of the calculations show that electron-capture rates obtained either with different Skyrme sets or with different available models can differ by up to a few orders of magnitude.
Highlights
Weak interaction processes play a crucial role in the life of a star, especially during the late evolutionary stages of massive stars [1, 2]
Electron-capture rates on nuclei for stellar conditions are calculated for Ni isotopes, using a self-consistent microscopic model based on the finitetemperature Skyrme Hartree-Fock plus finite-temperature charge-exchange randomphase approximation approach
The results obtained by different theoretical models, as well as the rates obtained from the experimental GT distributions extracted from (n, p) reactions [16,17,18], are shown
Summary
Weak interaction processes play a crucial role in the life of a star, especially during the late evolutionary stages of massive stars [1, 2]. During the pre-supernova phase, β decays, (Z, N) −→ (Z + 1, N − 1) + e− + νe , and electron captures (ECs), (Z, N) + e− −→ (Z − 1, N + 1) + νe , determine the core entropy and the electron fraction Ye, which defines the mass of the inner core When such a core exceeds the Chandrasekhar mass, MCh ∝ Ye2, it undergoes a gravitational collapse followed by a bounce. For initial Ye ≈ 0.5, the EC dominates over β decay, and mainly occurs on nuclei with mass number A 60 for densities below few 1010 g cm−3 and temperatures between 300 and 800 keV Under these conditions, the electron chemical potential μe is of the same order of magnitude as the nuclear Q-value, and EC cross sections are sensitive to the details of the GT strength distribution. Because of their pivotal role in astrophysical applications, weak interactions were extensively investigated within various approaches
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