Supernova electron capture rates on odd-odd nuclei

Abstract

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.

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

References in corpus (3)

• Electron capture on iron group nuclei
• Supernova electron capture rates for 55Co and 56Ni
• Gamow-Teller strength distributions in fp-shell nuclei

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