Level-density parameters in superheavy nuclei

Abstract

We systematically study the nuclear level densities of superheavy nuclei, including odd systems, using the single-particle energies obtained with the Woods-Saxon potential diagonalization. Minimization over many deformation parameters for the global minima - ground states and the "imaginary water flow" technique on many deformation energy grids for the saddle points, including nonaxial shapes has been applied. The level density parameters are calculated by fitting the obtained results with the standard Fermi gas expression. The total potential energy and shell correction dependencies of the level-density parameter are analyzed and compared at the ground state and saddle point. These parameters are compared with the results of the phenomenological expression. As shown, this expression should be modified for the saddle points, especially for small excitation energy. The ratio of the level-density parameter at the saddle point to that at the ground state is shown to be crucial for the survival probability of the heavy nucleus.

arXiv commentsubmitted to PRC

References in corpus (8)

• Predictions of the FBD model for the synthesis cross sections of Z = 114-120 elements based on macroscopic-microscopic fission barriers
• Properties of heaviest nuclei with $98\le Z\le 126$ and $134\le N\le 192$
• Adiabatic fission barriers in superheavy nuclei
• Q-alpha values in superheavy nuclei from the deformed Woods-Saxon model
• A High-Performance Algorithm to Calculate Spin- and Parity-Dependent Nuclear Level Densities
• How to produce new superheavy nuclei?
• Static fission properties of actinide nuclei
• Effect of tetrahedral shapes in heavy and superheavy nuclei

Cited by in corpus (2)

• The Fusion-by-Diffusion model as a tool to calculate cross sections for the production of superheavy nuclei
• Multi-step particle emission probabilities in superheavy nuclei at moderate excitation energies