Surface diffuseness anomaly in heavy-ion potentials for large-angle quasielastic scattering

Abstract

Recent high precision experimental data for heavy-ion fusion reactions at subbarrier energies systematically show that a surprisingly large surface diffuseness parameter for a Woods-Saxon potential is required in order to fit the data. We point out that experimental data for quasi-elastic scattering at backward angles also favor a similar large value of surface diffuseness parameter. Consequently, a double folding approach fails to reproduce the experimental excitation function of quasielastic scattering for the ${}^{16}$O + ${}^{154}$Sm system at energies around the Coulomb barrier. We also show that the deviation of the ratio of the quasielastic to the Rutherford cross sections from unity at deep subbarrier energies offers an unambiguous way to determine the value of the surface diffuseness parameter in the nucleus-nucleus potential.

4 pages, 2 eps figures

References in corpus (5)

• A program for coupled-channels calculations with all order couplings for heavy-ion fusion reactions
• Influence of nuclear structure on sub-barrier hindrance in Ni+Ni fusion
• Large-angle scattering and quasi-elastic barrier distributions
• Fusion cross sections at deep subbarrier energies
• Applicability of the orientation average formula in heavy-ion fusion reactions of deformed nuclei

Cited by in corpus (3)

• Probing surface diffuseness of nucleus-nucleus potential with quasielastic scattering at deep sub-barrier energies
• Novel insights into transfer processes in the reaction 16O+208Pb at sub-barrier energies
• Symmetry and Supersymmetry in Nuclear Physics