Reduction of the neutron imaginary potential off the stability line and its possible impact on neutron capture rates

A. V. Voinov, K. Brandenburg, C. R. Brune, R. Giri, S. M. Grimes, T. Massey, Z. Meisel, S. N. Paneru, A. L. Richard, G. Perdikakis, and A. Falduto
Phys. Rev. C 104, 015805 – Published 22 July 2021

Abstract

The effect of the isovector imaginary optical potential has been studied experimentally by using the particle-evaporation technique for the B11+Ca48 reaction with a 21.8 MeV B11 beam. Spectra of neutron, proton, and α particles emitted from the neutron-rich compound nucleus Mn59 have been measured and analyzed with traditional optical model potentials with their original parametrizations as well as with adjusted isovector imaginary components. It is shown that the isovector component of the imaginary potential is indispensable in the reproduction of proton and α-particle yields from this reaction and even needs to be enhanced compared with the suggestions of the original model parametrizations. This can lead to important consequences for astrophysical reaction-rate calculations.

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  • Received 2 February 2021
  • Revised 1 June 2021
  • Accepted 23 June 2021

DOI:https://doi.org/10.1103/PhysRevC.104.015805

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. V. Voinov*, K. Brandenburg, C. R. Brune, R. Giri, S. M. Grimes, T. Massey, Z. Meisel, S. N. Paneru, and A. L. Richard

  • Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA

G. Perdikakis and A. Falduto§

  • Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA

  • *voinov@ohio.edu
  • Present address: Holmes Community College, Ridgeland, Mississippi 39157, USA.
  • Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • §Present address: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.

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Vol. 104, Iss. 1 — July 2021

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