Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process

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

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Abstract

The stellar reaction rates of radiative α-capture reactions on heavy isotopes are of crucial importance for the γ process network calculations. These rates are usually derived from statistical model calculations, which need to be validated, but the experimental database is very scarce. This paper presents the results of α-induced reaction cross section measurements on iridium isotopes carried out at first close to the astrophysically relevant energy region. Thick target yields of 191Ir(α,γ)195Au, 191Ir(α,n)194Au, 193Ir(α,n)196mAu, 193Ir(α,n)196Au reactions have been measured with the activation technique between Eα=13.4 MeV and 17 MeV. For the first time the thick target yield was determined with X-ray counting. This led to a previously unprecedented sensitivity. From the measured thick target yields, reaction cross sections are derived and compared with statistical model calculations. The recently suggested energy-dependent modification of the α + nucleus optical potential gives a good description of the experimental data.

Original languageEnglish
Pages (from-to)396-401
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume776
Early online date2 Dec 2017
DOIs
Publication statusPublished - 10 Jan 2018

Keywords

  • Activation method
  • Astrophysical γ process
  • Nuclear astrophysics
  • Thick target yield
  • α-induced reactions

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