Influence of nuclear structure on sub-barrier hindrance in Ni+Ni fusion
Abstract
Fusion-evaporation cross sections for 64Ni+64Ni have been measured down to the 10 nb level. For fusion between two open-shell nuclei, this is the first observation of a maximum in the S-factor, which signals a strong sub-barrier hindrance. A comparison with the 58Ni+58Ni, 58Ni+60Ni, and 58Ni+64Ni systems indicates a strong dependence of the energy where the hindrance occurs on the stiffness of the interacting nuclei.
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