Core-exchange effects in like-ion scattering

The influence of blocking on core-exchange effects is studied by examining several scattering systems, characterized by the common feature of having a small nucleon-number difference equal to 2. The analysis is performed in terms of a macroscopic model in which the intercluster potential employed contains a Majorana space-exchange component. The result shows that such influence is weak in the d + α system, moderate in the α + 6Li system, but strong in the 16O + 18O system. In addition, it is found that, even when there is appreciable blocking, core-exchange contributions are significant. This indicates that, in a two-cluster system, the nucleon-number difference is still the dominant factor in determining the importance of the core-exchange terms. (orig.)