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, 72–78Ni, 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.
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The authors would like to acknowledge the support of the Horia Hulubei Foundation through the project PCE-IDEI-2011-3-0318, Contract No. 58.11.2011.
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Nabi, JU., Stoica, S. Unique first-forbidden β-decay rates for neutron-rich nickel isotopes in stellar environment. Astrophys Space Sci 349, 843–855 (2014). https://doi.org/10.1007/s10509-013-1673-1
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DOI: https://doi.org/10.1007/s10509-013-1673-1