Assessment of nonlocal nuclear potentials in α decay

J. E. Perez Velasquez, N. G. Kelkar, and N. J. Upadhyay
Phys. Rev. C 99, 024308 – Published 11 February 2019

Abstract

Different models for the nonlocal description of the nuclear interaction are compared through a study of their effects on the half-lives of radioactive nuclei decaying by the emission of alpha particles. The half-lives are evaluated by considering a preformed α particle (He4 nucleus), which tunnels through the Coulomb barrier generated by its interaction with the daughter nucleus. An effective potential obtained from a density-dependent double-folding strong potential between the α and the daughter nucleus within the nonlocal framework is found to decrease the half-lives as compared to those in the absence of nonlocalities. Whereas the percentage decrease within the older Perey-Buck and São Paulo models ranges between 20 to 40% for medium to heavy nuclei, a recently proposed effective potential leads to a decrease of only 2 to 4%. In view of these results, we provide a closer examination of the approximations used in deriving the local equivalent potentials and propose that, apart from the scattering data, the α decay half-lives can be used as a complementary tool for constraining the nonlocality models.

  • Figure
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  • Received 14 October 2018
  • Revised 10 December 2018

DOI:https://doi.org/10.1103/PhysRevC.99.024308

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

J. E. Perez Velasquez* and N. G. Kelkar

  • Departamento de Fisica, Universidad de los Andes, Cra.1E No.18A-10, Bogotá, Colombia

N. J. Upadhyay

  • School of Physical Sciences, UM-DAE Centre for Excellence in Basic Sciences, Vidyanagari, Mumbai 400098, India

  • *je.perez43@uniandes.edu.co
  • nkelkar@uniandes.edu.co
  • neelam.upadhyay@cbs.ac.in

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Issue

Vol. 99, Iss. 2 — February 2019

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