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اخترفیزیک و علوم فضایی 2013
جزئیات رویداد
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  • unique first-forbidden β-decay rates for neutron-rich nickel isotopes in stellar environment

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 896
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     in astrophysical environments, allowed gamow-teller (gt) transitions are important, particularly forβ-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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