dorsal/arxiv
View SchemaSupernova electron capture rates for 55Co and 56Ni
| Authors | K. Langanke, G. Martinez-Pinedo |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9809081 |
| URL | https://arxiv.org/abs/nucl-th/9809081 |
| DOI | 10.1016/S0370-2693(98)00892-2 |
| Journal | Phys.Lett. B436 (1998) 19-24 |
Abstract
We have calculated the Gamow-Teller strength distributions for the ground states and first excited states in 55Co and 56Ni. These calculations have been performed by shell model diagonalization in the pf shell using the KB3 interaction. The Gamow-Teller distributions are used to calculate the electron capture rates for typical presupernova conditions. Our 55Co rate is noticeably smaller than the presently adopted rate as it is dominated by weak low-lying transitions rather than the strong Gamow-Teller (GT) resonance which is located at a higher excitation energy in the daughter than usually parametrized. Although our 56Ni rate agrees with the presently adopted rate, we do not confirm the conventional parametrization of the GT centroid. Our results support general trends suggested on the basis of shell model Monte Carlo calculations.
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"abstract": "We have calculated the Gamow-Teller strength distributions for the ground\nstates and first excited states in 55Co and 56Ni. These calculations have been\nperformed by shell model diagonalization in the pf shell using the KB3\ninteraction. The Gamow-Teller distributions are used to calculate the electron\ncapture rates for typical presupernova conditions. Our 55Co rate is noticeably\nsmaller than the presently adopted rate as it is dominated by weak low-lying\ntransitions rather than the strong Gamow-Teller (GT) resonance which is located\nat a higher excitation energy in the daughter than usually parametrized.\nAlthough our 56Ni rate agrees with the presently adopted rate, we do not\nconfirm the conventional parametrization of the GT centroid. Our results\nsupport general trends suggested on the basis of shell model Monte Carlo\ncalculations.",
"arxiv_id": "nucl-th/9809081",
"authors": [
"K. Langanke",
"G. Martinez-Pinedo"
],
"categories": [
"nucl-th",
"astro-ph"
],
"doi": "10.1016/S0370-2693(98)00892-2",
"journal_ref": "Phys.Lett. B436 (1998) 19-24",
"title": "Supernova electron capture rates for 55Co and 56Ni",
"url": "https://arxiv.org/abs/nucl-th/9809081"
},
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