Hindrance of heavy-ion fusion at extreme sub-barrier energies in open-shell colliding systems

C. L. Jiang*, K. E. Rehm, H. Esbensen, R. V.F. Janssens, B. B. Back, C. N. Davids, J. P. Greene, D. J. Henderson, C. J. Lister, R. C. Pardo, T. Pennington, D. Peterson, D. Seweryniak, B. Shumard, S. Sinha, X. D. Tang, I. Tanihata, S. Zhu, P. Collon, S. KurtzM. Paul

*Corresponding author for this work

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Abstract

The excitation function for the fusion-evaporation reaction 64Ni + 100Mo has been measured down to a cross section of ∼5 nb. Extensive coupled-channels calculations have been performed, which cannot reproduce the steep falloff of the excitation function at extreme sub-barrier energies. Thus, this system exhibits a hindrance for fusion, a phenomenon that has been discovered only recently. In the S-factor representation introduced to quantify the hindrance, a maximum is observed at Es = 120.6 MeV, which corresponds to 90% of the reference energy Esref, a value expected from systematics of closed-shell systems. A systematic analysis of Ni-induced fusion reactions leading to compound nuclei with mass A = 100-200 is presented in order to explore a possible dependence of fusion hindrance on nuclear structure.

Original languageEnglish
Article number044613
JournalPhysical Review C - Nuclear Physics
Volume71
Issue number4
DOIs
StatePublished - Apr 2005

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