Empirical description of β-delayed fission partial half-lives

L. Ghys, A. N. Andreyev, S. Antalic, M. Huyse, and P. Van Duppen
Phys. Rev. C 91, 044314 – Published 16 April 2015

Abstract

Background: The process of β-delayed fission (βDF) provides a versatile tool to study low-energy fission in nuclei far away from the β-stability line, especially for nuclei which do not fission spontaneously.

Purpose: The aim of this paper is to investigate systematic trends in βDF partial half-lives.

Method: A semi-phenomenological framework was developed to systematically account for the behavior of βDF partial half-lives.

Results: The βDF partial half-life appears to exponentially depend on the difference between the Q value for β decay of the parent nucleus and the fission-barrier energy of the daughter (after β decay) product. Such dependence was found to arise naturally from some simple theoretical considerations.

Conclusions: This systematic trend was confirmed for experimental βDF partial half-lives spanning over seven orders of magnitude when using fission barriers calculated from either the Thomas-Fermi or the liquid-drop fission model. The same dependence was also observed, although less pronounced, when comparing to fission barriers from the finite-range liquid-drop model or the Thomas-Fermi plus Strutinsky integral method.

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  • Received 30 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.044314

©2015 American Physical Society

Authors & Affiliations

L. Ghys1,2,*, A. N. Andreyev3,4, S. Antalic5, M. Huyse1, and P. Van Duppen1

  • 1KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
  • 2Belgian Nuclear Research Centre SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
  • 3Department of Physics, University of York, York YO10 5DD, United Kingdom
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki 319-1195, Japan
  • 5Department of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, Slovakia

  • *lars.ghys@fys.kuleuven.be

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Issue

Vol. 91, Iss. 4 — April 2015

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