Alpha-induced reaction cross section measurements on Eu-151 for the astrophysical gamma-process

Gy. Gyuerky, Z. Elekes, J. Farkas, Zs. Fueloep, Z. Halasz, G. G. Kiss, E. Somorjai, T. Szuecs, R. T. Guray, N. Ozkan, C. Yalcin, T. Rauscher

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Abstract

In order to extend the experimental database relevant for the astrophysical gamma-process towards the unexplored heavier mass region, the cross sections of the Eu-151(alpha, gamma)Tb-155 and Eu-151 (alpha, n)Tb-154 reactions have been measured at low energies between 12 and 17 MeV using the activation technique. The results are compared with the predictions of statistical model calculations and it is found that the calculations overestimate the cross sections by about a factor of 2. A sensitivity analysis shows that this discrepancy is caused by the inadequate description of the alpha+nucleus channel. A factor of 2 reduction of the reaction rate of Eu-151(alpha, gamma)Tb-155 in gamma-process network calculations with respect to theoretical rates using the optical potential by McFadden and Satchler (1966 Nucl. Phys. 84 177) is recommended.

Original languageEnglish
Article number115201
Number of pages15
JournalJournal of Physics G: Nuclear and Particle Physics
Volume37
Issue number11
DOIs
Publication statusPublished - Nov 2010

Keywords

  • NUCLEAR
  • STATISTICAL-MODEL CALCULATIONS
  • SCATTERING
  • PROCESS NUCLEOSYNTHESIS
  • MASSIVE STARS
  • S-PROCESS
  • RP-PROCESS
  • REACTION-RATES
  • STELLAR NUCLEOSYNTHESIS
  • P-PROCESS

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