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- Title
Unique first-forbidden β-decay rates for neutron-rich nickel isotopes in stellar environment.
- Authors
Nabi, Jameel-Un; Stoica, Sabin
- Abstract
In astrophysical environments, allowed Gamow-Teller (GT) transitions are important, particularly for β-decay rates in presupernova evolution of massive stars, since they contribute to the fine-tuning of the lepton-to-baryon content of the stellar matter prior to and during the collapse of a heavy star. In environments where GT transitions are unfavored, first-forbidden transitions become important especially in medium heavy and heavy nuclei. Particularly in case of neutron-rich nuclei, first-forbidden transitions are favored primarily due to the phase-space amplification for these transitions. In this work the total β-decay half-lives and the unique first-forbidden (U1F) β-decay rates for a number of neutron-rich nickel isotopes, Ni, are calculated using the proton-neutron quasi-particle random phase approximation (pn-QRPA) theory in stellar environment for the first time. For the calculation of the β-decay half-lives both allowed and unique first-forbidden transitions were considered. Comparison of the total half-lives is made with measurements and other theoretical calculations where it was found that the pn-QRPA results are in better agreement with experiments and at the same time are suggestive of inclusion of rank 0 and rank 1 operators in first-forbidden rates for still better results.
- Subjects
STELLAR activity; DECAY rates (Radioactivity); NEUTRON sources; POTENTIAL barrier; NICKEL isotopes; HEAVY nuclei
- Publication
Astrophysics & Space Science, 2014, Vol 349, Issue 2, p843
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-013-1673-1