Systematics of threshold incident energy for deep sub-barrier fusion hindrance

Abstract

We systematically evaluate the potential energy at the touching configuration for heavy-ion reactions using various potential models. We point out that the energy at the touching point, especially that estimated with the Krappe-Nix-Sierk (KNS) potential, strongly correlates with the threshold incident energy for steep fall-off of fusion cross sections observed recently for several systems at extremely low energies. This clearly indicates that the steep fall-off phenomenon can be attributed to the dynamics after the target and projectile touch with each other, e.g., the tunneling process and the nuclear saturation property in the overlap region.

arXiv comment5 pages, 3 figures

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• Systematic investigations of deep sub-barrier fusion reactions using an adiabatic approach
• Potential inversion with subbarrier fusion data revisited
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• A Universal Damping Mechanism of Quantum Vibrations in Deep Sub-Barrier Fusion Reactions
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• Quasi-elastic scattering in the 20Ne + 90,92Zr reactions: role of non-collective excitations
• Density Functional Theory Approach to Nuclear Fission
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• Origin of a maximum of astrophysical $S$ factor in heavy-ion fusion reactions at deep subbarrier energies
• Nucleosynthesis: what direct reactions can do for it?
• Evolving theoretical descriptions of heavy-ion fusion :from phenomenological to microscopic approaches