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Abstract
Abstract Elastic and inelastic scattering of 12C ions on 12C and 208Pb targets have been measured at the incident energies per nucleon E / A = 120 MeV/u and E / A = 200 MeV/u. Optical-model analysis is reported and nuclear surface transparency effects are discussed, together with the nuclear potential-energy dependence. The transparency region extends down to a radial internuclear distance of about 3 fm for the 12C-12C system and 8 fm for the 12C-208Pb system. A decrease of the imaginary potential with increasing incident energy is deduced for the two systems. Anomalous collapse of the real potential in the surface region is observed for 12C-208Pb system at 200 MeV/u. DWBA analysis of data on the 2+, 4.4 MeV state of 12C is reported and trends for the energy dependance of mean-field excitations are deduced.
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