Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-08-23
J. Phys.G 37:115201, 2010
Physics
Nuclear Physics
Nuclear Experiment
Accepted for publication in J. Phys. G
Scientific paper
10.1088/0954-3899/37/11/115201
In order to extend the experimental database relevant for the astrophysical gamma-process towards the unexplored heavier mass region, the cross sections of the 151Eu(alpha,gamma)155Tb and 151Eu(alpha,n)154Tb 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 alpha+nucleus channel. A factor of two reduction of the reaction rate of 151Eu(alpha,gamma)155Tb in gamma-process network calculations with respect to theoretical rates using the optical potential by McFadden and Satchler (1966) is recommended.
Elekes Z.
Farkas Janos
Fulop Zs
Guray Taygun R.
Gyurky Gy
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