Fusion cross sections at deep subbarrier energies

Details Fusion cross sections at deep subbarrier energies Fusion cross sections at deep subbarrier energies

2003-02-12

arxiv.org/abs/nucl-th/0302025v1

Phys.Rev. C67 (2003) 054603

Physics

Nuclear Physics

Nuclear Theory

9 pages, 3 eps figures

Scientific paper

10.1103/PhysRevC.67.054603

A recent publication reports that heavy-ion fusion cross sections at extreme subbarrier energies show a continuous change of their logarithmic slope with decreasing energy, resulting in a much steeper excitation function compared with theoretical predictions. We show that the energy dependence of this slope is partly due to the asymmetric shape of the Coulomb barrier, that is its deviation from a harmonic shape. We also point out that the large low-energy slope is consistent with the surprisingly large surface diffusenesses required to fit recent high-precision fusion data.

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