Shell-model half-lives including first-forbidden contributions for r-process waiting-point nuclei

Q. Zhi, E. Caurier, J. J. Cuenca-García, K. Langanke, G. Martínez-Pinedo, and K. Sieja
Phys. Rev. C 87, 025803 – Published 15 February 2013

Abstract

We have performed large-scale shell-model calculations of the half-lives and neutron-branching probabilities of the r-process waiting-point nuclei at the magic neutron numbers N=50, 82, and 126. The calculations include contributions from allowed Gamow-Teller and first-forbidden transitions. We find good agreement with the measured half-lives for the N=50 nuclei with charge numbers Z=28–32 and for the N=82 nuclei 129Ag and 130Cd. The contribution of forbidden transitions reduce the half-lives of the N=126 waiting-point nuclei significantly, while they have only a small effect on the half-lives of the N=50 and 82 r-process nuclei.

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  • Received 1 December 2012

DOI:https://doi.org/10.1103/PhysRevC.87.025803

©2013 American Physical Society

Authors & Affiliations

Q. Zhi1,2,3, E. Caurier4, J. J. Cuenca-García2, K. Langanke1,2,5, G. Martínez-Pinedo1,2, and K. Sieja4

  • 1Institut für Kernphysik (Theoriezentrum), Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt, Germany
  • 2GSI Helmholtzzentrum für Schwerioneneforschung, Planckstraße 1, 64291 Darmstadt, Germany
  • 3School of Physics and Electronic Science, Guizhou Normal University, 550001 Guiyang, People's Republic of China
  • 4Université de Strasbourg, IPHC, 23 rue du Loess, CNRS, UMR7178, 67037 Strasbourg, France
  • 5Frankfurt Institute of Advanced Studies, Ruth-Moufang Straße 1, 60438 Frankfurt, Germany

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Issue

Vol. 87, Iss. 2 — February 2013

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