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Investigation of Weak Rates for Odd-A Nuclei for Presupernova Simulations

  • Nuclear Physics
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Abstract

Calculating weak decay rates under stellar conditions for studying presupernova evolution of massive stars is a challenging task. Here, we show the importance of odd-A nuclei for presupernova simulations. In order to calculate the required nuclear matrix elements, we apply the pn-QRPA model in a deformed basis. Nuclear deformation, thought to play an integral role in calculation of associated weak decay rates, is taken into account in our model. We calculate Gamow–Teller (GT) strength distributions, \(\beta ^-\) emission and positron capture rates for selected odd-A nuclei. Our model does not employ the Brink–Axel hypothesis as used in previous calculations of weak decay rates, and we perform a state-by-state microscopic calculation of GT strength distributions from all parent excited states. Our calculated \(\beta ^-\) decay rates are in good agreement with large-scale shell model calculations.

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Acknowledgements

J.U. Nabi would like to acknowledge the support of the Higher Education Commission Pakistan through project numbers 5557/KPK/NRPU/R&D/HEC/2016 and 9-5(Ph-1-MG-7)Pak-Turk/R&D/HEC/2017 and Pakistan Science Foundation through project number PSF-TUBITAK/KP-GIKI (02).

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Authors and Affiliations

  1. Faculty of Sciences, Department of Physics, University of Okara, Okara, Punjab, Pakistan

    Muhammad Riaz

  2. University of Wah, Quaid Avenue, Wah Cantt, Punjab, 47040, Pakistan

    Jameel-Un Nabi

  3. GIK Institute of Engineering Sciences and Technology, Topi, Khyber Pakhtunkhwa, 23640, Pakistan

    Jameel-Un Nabi & Muhammad Majid

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  1. Muhammad Riaz
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Correspondence to Muhammad Riaz.

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Riaz, M., Nabi, JU. & Majid, M. Investigation of Weak Rates for Odd-A Nuclei for Presupernova Simulations. Braz J Phys 51, 773–779 (2021). https://doi.org/10.1007/s13538-021-00864-0

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