THE ROLE OF NUCLEAR-DYNAMICS IN THE POPULATION OF HIGHLY-DEFORMED ANDSUPER-DEFORMED BANDS

The population of the highly-deformed band in Nd-133 has been studied using the reactions S-32 + Pd-105 and Ni-60 + Se-77 to form the compou nd nucleus Sm-137 at comparable excitation energy. Experimental result s do not show any dependence on the entrance-channel mass asymmetry, i n agreement with recent results for Nd-135 and at variance with those for the Gd-147, Gd-148 and Dy-152 nuclei. The experimental data on the entrance-channel dependence of the population of highly- and super-de formed bands in the mass regions A approximately 130,150 and 190 are d iscussed in terms of dynamical effects which occur during the formatio n process of the compound nucleus as well as in the fission channel.