Gamow-Teller and first-forbidden decays near the r-process paths at N=50,82, and 126

I. N. Borzov
Phys. Rev. C 67, 025802 – Published 27 February 2003
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Abstract

The β-decay rates of neutron-rich nuclei relevant to the r-process nucleosynthesis are mostly beyond experimental reach. Their predictions demand a self-consistent extrapolation of various nuclear properties away from the experimentally known regions. The allowed transitions approximation commonly used in large-scale microscopic calculations also needs to be revised in different mass regions. The density functional+continuum QRPA approximation to self-consistent calculations of the ground state properties, Gamow-Teller and first-forbidden β-decay transitions of nuclei far from stability is developed. Systematic calculations are performed of the allowed and first-forbidden β-decay rates for the r-process relevant nuclides near the closed neutron shells at N=50,82,126. The importance of first-forbidden decays near Z>~50,N82 and near N=126 is shown. The total β-decay half-lives in the region “east” of the 208Pb are estimated. A comparison with recent experimental data, global calculations, and self-consistent microscopic predictions is presented.

  • Received 26 September 2002

DOI:https://doi.org/10.1103/PhysRevC.67.025802

©2003 American Physical Society

Authors & Affiliations

I. N. Borzov*

  • Institute for Nuclear Theory, University of Washington, Box 351550, Seattle, Washington 98195
  • Institut d’Astronomie et d’Astrophysique, Universite Libre de Bruxelles, CP226, Bvd. duTriomphe, 1050 Bruxelles, Belgium

  • *Also at State Scientific Centre–Institute of Physics and Power Engineering, 249020 Obninsk, Russia.

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Vol. 67, Iss. 2 — February 2003

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