Energy dependence in 12C + 28Si elastic scattering

Abstract We have measured elastic scattering of 131.5 MeV 12 C by 28 Si. These data are compared with measurements at 60, 74 and 186 MeV, and with optical-model analyses for these and lower energies. We find that there exists no evidence for energy dependence in the best-fit optical potentials for 12 C energies of 131.5 and 186 MeV, but the potentials required for energies between 30 and 74 MeV are highly energy dependent.