University of Hertfordshire

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  • 1503.01853v1

    Accepted author manuscript, 285 KB, PDF document

  • G. G. Kiss
  • T. Szücs
  • T. Rauscher
  • Zs Török
  • L. Csedreki
  • Zs Fülöp
  • Gy Gyürky
  • Z. Halász
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Original languageEnglish
Article number055103
Number of pages10
JournalJournal of Physics G: Nuclear and Particle Physics
Volume42
Issue5
DOIs
Publication statusPublished - 1 May 2015

Abstract

The γ-process in core-collapse and/or type Ia supernova explosions is thought to explain the origin of the majority of the so-called p nuclei (the 35 proton-rich isotopes between Se and Hg). Reaction rates for γ-process reaction network studies have to be predicted using Hauser-Feshbach statistical model calculations. Recent investigations have shown problems in the prediction of α-widths at astrophysical energies which are an essential input for the statistical model. It has an impact on the reliability of abundance predictions in the upper mass range of the p nuclei. With the measurement of the <sup>164,166</sup>Er(α,n)<sup>167,169</sup>Yb reaction cross sections at energies close to the astrophysically relevant energy range we tested the recently suggested low energy modification of the α+nucleus optical potential in a mass region where γ-process calculations exhibit an underproduction of the p nuclei. Using the same optical potential for the α-width which was derived from combined <sup>162</sup>Er(α,n) and <sup>162</sup>Er(α,γ) measurement makes it plausible that a low-energy modification of the optical α+nucleus potential is needed.

Notes

Date of Acceptance: 30/01/2015

ID: 8533202