Elastic-scattering and reaction cross section analysis of the 12C+12C system at low energies

An optical model analysis of the intermediate resonant structure for the 90degrees-elastic scattering and fusion excitation function at the low energy region E-c.m. = 2.5 similar to 19 MeV has been performed. Optical potentials with variable geometry were applied on the basis of a regular fit of the angular distributions at these energies. Calculations show that a strongly energy dependent interference picture, observed in the elastic scattering of C-12+C-12 ions, can be successfully reproduced in the framework of the optical model. The resulting optical potential with an energy dependent adjusted power parameter and an also energy dependent imaginary strength W is valid to give a good description of the individual elastic-scattering angular distributions and to reproduce detailed features of the elastic-scattering and reaction excitation functions.