Alpha-induced reaction cross section measurements on 151Eu for the astrophysical -process
Résumé
In order to extend the experimental database relevant for the astrophysical γ-process towards the unexplored heavier mass region, the cross sections of the 151 Eu(α, γ) 155 Tb and 151 Eu(α, n) 154 Tb 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 two. A sensitivity analysis shows that this discrepancy is caused by the inadequate description of the α+nucleus channel. A factor of two reduction of the reaction rate of 151 Eu(α, γ) 155 Tb in γ-process network calculations with respect to theoretical rates using the optical potential by McFadden and Satchler (1966) is recommended.
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