Bulg. J. Phys. vol.48 no.5-6 (2021), pp. 485-494



Level Densities of Heavy Nuclei and Fission Dynamics

A. Rahmatinejad1, T. Shneidman1, G. Adamian1, N.V. Antonenko1, P. Jachimowicz2, M. Kowal3
1Joint Institute for Nuclear Research, Dubna, 141980, Russia
2Institute of Physics, University of Zielona Góra, Szafrana 4a, 65516 Zielona Góra, Poland
3National Centre for Nuclear Research, Pasteura 7, 02-093 Warsaw, Poland
Abstract. The nuclear level densities and level-density parameters in fissioning nuclei at their saddle points of fission barriers, as well as those for neutron, proton, and α-particle emission residues at the ground states are calculated for isotopic chains of superheavy nuclei with Z = 114-120. The calculations are performed with superfluid formalism using the single-particle energies obtained with the Woods-Saxon potential. The influence of shell effects on energy dependence of the ratios of level-density parameters corresponding to the residues of considered decay modes to those of neutron emission is analyzed. The effect of collective enhancement of level densities on the level-density parameter ratios is studied. In the case of alpha decay, we identified the collective enhancement caused by cluster degrees of freedom to play an important role.

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