Effective stellar β-decay rates of nuclei with long-lived isomers: Al26 and Cl34

Projjwal Banerjee, G. Wendell Misch, Surja K. Ghorui, and Yang Sun
Phys. Rev. C 97, 065807 – Published 29 June 2018

Abstract

Isotopes with low-lying long-lived isomers can behave very differently from other isotopes in astrophysical environments. In particular, the assumption of thermal equilibrium in computing the temperature-dependent β-decay rates of such isotopes can fail below certain temperatures. We focus on the β decay of Al26 since it is one of the most important isotopes in observational astrophysics and has a low-lying isomeric state; we compare and contrast these results with Cl34. We rule out recently reported Al26 effective β-decay rates that showed large differences from previous calculations, finding that we agree with the earlier results. We conclude that in general, effective β-decay rates should be defined separately for the ground and isomeric states at temperatures where thermal equilibrium cannot be achieved.

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  • Received 16 April 2018

DOI:https://doi.org/10.1103/PhysRevC.97.065807

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Projjwal Banerjee1,*, G. Wendell Misch2,3,†, Surja K. Ghorui2,‡, and Yang Sun2,3,4,§

  • 1Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Department of Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • 4Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

  • *projjwal@sjtu.edu.cn
  • wendell.misch@gmail.com (preferred); wendell@sjtu.edu.cn
  • surja@sjtu.edu.cn
  • §sunyang@sjtu.edu.cn

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Vol. 97, Iss. 6 — June 2018

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