Origin of a maximum of the astrophysical S factor in heavy-ion fusion reactions at deep subbarrier energies

K. Hagino, A. B. Balantekin, N. W. Lwin, and Ei Shwe Zin Thein
Phys. Rev. C 97, 034623 – Published 29 March 2018

Abstract

The hindrance phenomenon of heavy-ion fusion cross sections at deep subbarrier energies often accompanies a maximum of an astrophysical S factor at a threshold energy for fusion hindrance. We argue that this phenomenon can naturally be explained when the fusion excitation function is fitted with two potentials, with a larger (smaller) logarithmic slope at energies lower (higher) than the threshold energy. This analysis clearly suggests that the astrophysical S factor provides a convenient tool to analyze the deep subbarrier hindrance phenomenon, even though the S factor may have a strong energy dependence for heavy-ion systems unlike that for astrophysical reactions.

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  • Received 29 January 2018

DOI:https://doi.org/10.1103/PhysRevC.97.034623

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

K. Hagino1,2, A. B. Balantekin3, N. W. Lwin4, and Ei Shwe Zin Thein5

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2Research Center for Electron Photon Science, Tohoku University, 1-2-1 Mikamine, Sendai 982-0826, Japan
  • 3Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
  • 4Department of Physics, Mandalay University of Distance Education, Mandalay, Myanmar
  • 5Department of Physics, Yadanabon University, Mandalay, Myanmar

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Issue

Vol. 97, Iss. 3 — March 2018

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