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

K. Hagino, T. Takehi, A. B. Balantekin, N. Takigawa

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54 Citations (Scopus)


Recent high precision experimental data for heavy-ion fusion reactions at sub-barrier 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 quasielastic scattering at backward angles also favor a similar large value of the surface diffuseness parameter. Consequently, a double folding approach with a short-range imaginary potential for the compound nucleus formation fails to reproduce the experimental excitation function of quasielastic scattering for the 16O + 154Sm 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 sub-barrier energies offers an unambiguous way to determine the value of the surface diffuseness parameter in the nucleus-nucleus potential.

Original languageEnglish
Article number044612
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 2005 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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