Low-energy behaviour of the heavy-ion optical model potentials for 12C and 16O scattering from 208Pb

Abstract The probability of exciting the first 3 − state of 208 Pb has been studied using the optical-model potential. In the neighbourhood of the Coulomb barrier the strength of the imaginary part of the potential has been assumed to vary linearly with bombarding energy. The strength of the real part of the potential has been calculated using the dispersion relation. An excellent fit to experimental excitation functions has been obtained for both 12 C + 208 Pb and 16 O + 208 Pb reactions. The calculated angular-momentum distributions for various bombarding energies also agree very well with the experimental data.