DISSIPATIVE EFFECTS IN THE FORMATION OF THE ER-156 COMPOUND NUCLEUS

Light-charged particles were measured in coincidence with evaporation residues for C-12+Sm-144, Cl-35+ Sb-121, and Ni-60+Zr-96 reactions whi ch populate the compound nucleus Er-156 at the same excitation energy. The particle spectral shape for C-12+Sm-144 is harder than the other two reactions. A one-body dissipation model predicts that the fusion t imes for the Cl-35- and Ni-60-induced reactions are similar and are ab out twice as long as that of the C-12-induced reaction. Statistical mo del calculations considering particle evaporation during compound nucl eus formation successfully reproduce the particle spectra for all the reactions.