PAULI BLOCKING AND TRANSPARENCY IN ELASTIC HEAVY-IONS SCATTERING

For energies below E/A almost-equal-to 100 MeV a comparison of elastic heavy-ion phase shifts calculated by a double-Glauber approximation w ith those extracted from optical-model fits shows the Glauber approach to grossly overestimate the absorption out of the elastic channel, ev en though it produces plausible fits to the available angular distribu tions. We suggest that this overestimate, as a function of impact para meter, may provide a useful measure of the way in which Pauli blocking of NN collisions depends on the overlap density of the colliding nucl ei.