Hindrance of Heavy-ion Fusion at Extreme Sub-Barrier Energies in Open-shell Colliding Systems

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 fall-off 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 E_s=120.6 MeV, which corresponds to 90% of the reference energy E_s^ref, 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 the fusion hindrance on nuclear structure.

10 pages, 9 figures, Submitted to Phys. Rev. C

References in corpus (6)

• Quantum Tunneling in Nuclear Fusion
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• Fusion cross sections at deep subbarrier energies
• Validity of the linear coupling approximation in heavy-ion fusion reactions at sub barrier energies
• Is friction responsible for the reduction of fusion rates far below the Coulomb barrier?
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