Supernova electron capture rates on odd-odd nuclei

Details Supernova electron capture rates on odd-odd nuclei Supernova electron capture rates on odd-odd nuclei

1998-09-25

arxiv.org/abs/nucl-th/9809082v1

Phys.Lett. B453 (1999) 187-193

Physics

Nuclear Physics

Nuclear Theory

5 pages, 3 figures, RevTeX 3.1, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(99)00363-9

At densities between 10^8 and 10^10} g/cm^3 electron capture in a presupernova collapse is believed to mainly occur on odd-odd nuclei. We have derived the rates for six of the most important electron capturing nuclei, {54,56,58}Mn and {56,58,60}Co, based on calculations of the Gamow-Teller strength distributions for the ground states and first excited states. These calculations have been performed by shell model diagonalization in the pf shell using a recently modified version of the KB3 interaction. The shell model rates are noticeably smaller than the presently adopted rates as the latter have been derived by placing the Gamow-Teller (GT) resonance at too low excitation energies.

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