THE EXTENDED OPTICAL-MODEL WITH DISPERSION-RELATION FOR THE FUSION OFLIGHT HEAVY-ION SYSTEMS

Fusion excitation functions were calculated for light heavy-ion system s in the whole measured energy range. The calculations were performed by using the extended optical model for fusion which was applied with success for above-Coulomb-barrier energies. This model is based on the separate absorptive potential for fusion. The modification of the ext ended optical-model potential in the sub-barrier region occurs in its real and imaginary energy-dependent parts through the dispersion relat ion. The effect of the critical angular-momentum cut-off has been obta ined by the decrease of W(fus)(E) at the high-energy region. A very go od description of the experimental fusion cross sections were obtained for the following systems: C-12 + C-12, C-12 + N-14, C-12 + O-16, and O-16 + O-16. A detailed discussion of the parameters of the model is presented.