Abstract
The hindrance phenomenon of heavy-ion fusion cross sections at deep subbarrier energies often accompanies a maximum of an astrophysical factor at a threshold energy for fusion hindrance. We argue that this phenomenon can naturally be explained when the fusion excitation function is fitted with two potentials, with a larger (smaller) logarithmic slope at energies lower (higher) than the threshold energy. This analysis clearly suggests that the astrophysical factor provides a convenient tool to analyze the deep subbarrier hindrance phenomenon, even though the factor may have a strong energy dependence for heavy-ion systems unlike that for astrophysical reactions.
- Received 29 January 2018
DOI:https://doi.org/10.1103/PhysRevC.97.034623
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