BARRIER DISTRIBUTIONS AND SCATTERING

The extraction of representations of the fusion barrier distribution f rom backward-angle, quasi-elastic, elastic and transfer excitation fun ctions is discussed. Such excitation functions have been measured for O-16, S-32 and Ca-40, projectiles incident on a variety of targets. Th e results are compared with representations obtained from fusion excit ation functions. Varying in their sensitivity, all representations sho w evidence of the barrier structure. Differences between the scatterin g and the fusion representations can be related to the effects of coup ling to residual, weak reaction channels.