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The excitation function for the fusion-evaporation reaction 64Ni+100Mo hasbeen measured down to a cross-section of ~5 nb. Extensive coupled-channelscalculations have been performed, which cannot reproduce the steep fall-off ofthe excitation function at extreme sub-barrier energies. Thus, this systemexhibits a hindrance for fusion, a phenomenon that has been discovered onlyrecently. In the S-factor representation introduced to quantify the hindrance,a maximum is observed at E_s=120.6 MeV, which corresponds to 90% of thereference energy E_s^ref, a value expected from systematics of closed-shellsystems. A systematic analysis of Ni-induced fusion reactions leading tocompound nuclei with mass A=100-200 is presented in order to explore a possibledependence of the fusion hindrance on nuclear structure.Comment: 10 pages, 9 figures, Submitted to Phys. Rev.

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