Shell-model calculations of stellar weak interaction rates. I. Gamow-Teller distributions and spectra of nuclei in the mass range A = 45–65

• Published in: Nuclear physics. A Vol. 653; no. 4; pp. 439 - 452
• Main Authors: Caurier, E., Langanke, K., Martínez-Pinedo, G., Nowacki, F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 19.07.1999
• Subjects: 23.40.−s; 21.60Ka; 26.50.+x; 21.60Cs
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(99)00240-7

Electron capture and beta-decay rates on nuclei in the mass range A = 45–65 play an important role in many astrophysical environments. The determination of these rates by large-scale shell-model calculations is desirable, but it requires to reproduce the Gamow-Teller strength distributions and spectra of the pf shell nuclei. We show in this paper that large-scale shell-model calculations, employing a slightly monopole-corrected version of the well-known KB3 interaction, fulfill these necessary requirements. In particular, our calculations reproduce the experimentally available GT + and GT − strength distributions and the nuclear halflives, and describe the nuclear spectra appropriately.