Measurement of (α,n) reaction cross sections of erbium isotopes for testing astrophysical rate predictions

G. G. Kiss, T. Szücs, T. Rauscher, Zs Török, L. Csedreki, Zs Fülöp, Gy Gyürky, Z. Halász

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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.

Original languageEnglish
Article number055103
Number of pages10
JournalJournal of Physics G: Nuclear and Particle Physics
Volume42
Issue number5
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • activation method
  • astrophysical gammaprocess
  • measured cross section

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