Energy dependence of the nucleus–nucleus interaction in the 9Be + 12C system and the 9Be reorientation Original Research Article

The angular distributions of elastic and inelastic scattering of the 12C ions on the 9Be nuclei were measured using the Kiev U-240 cyclotron at the beam energy 65 MeV for the transitions to the ground state of the 12C nucleus and to the ground, 1.68 MeV and 2.43 MeV excited states of the 9Be nucleus. These data and elastic scattering in the 9Be + 12C system in the energy range of Ecm=5.14–90.46 MeV were analyzed within the optical and coupled reaction channel (CRC) models. The elastic and inelastic scattering, transfer reactions and spin reorientation of the 9Be nucleus in the ground state were included in the coupled channel scheme. The data of inelastic scattering at Elab(12C)=65 MeV were used to determine the deformation parameters of 9Be nucleus in the ground state. It was found that the reorientation process dominates in the elastic scattering data at large angles. A good description of all sets of experimental data was achieved. The energy dependence of parameters for the real and imaginary parts of the optical potential was analyzed using analytic forms of the Woods–Saxon type. The dispersion relation between the real and imaginary parts of the optical potential was applied in the analysis of the energy dependence. The parameters for the energy dependence of the 9Be + 12C optical potential were determined.