Fission Barriers of Compound Superheavy Nuclei

Abstract

The dependence of fission barriers on the excitation energy of the compound nucleus impacts the survival probability of superheavy nuclei synthesized in heavy-ion fusion reactions. In this work, we investigate the isentropic fission barriers by means of the self-consistent nuclear density functional theory. The relationship between isothermal and isentropic descriptions is demonstrated. Calculations have been carried out for ${}^{264}$Fm, ${}^{272}$Ds, ${}^{278}$112, ${}^{292}$114, and ${}^{312}$124. For nuclei around ${}^{278}$112 produced in "cold fusion" reactions, we predict a more rapid decrease of fission barriers with excitation energy as compared to the nuclei around ${}^{292}$114 synthesized in "hot fusion" experiments. This is explained in terms of the difference between the ground-state and saddle-point temperatures. The effect of the particle gas is found to be negligible in the range of temperatures studied.

4 pages, 5 figures(revised according to referee's comments)

References in corpus (3)

• Deformed Coordinate-Space Hartree-Fock-Bogoliubov Approach to Weakly Bound Nuclei and Large Deformations
• Pairing interactions and the vanishing pairing correlations in hot nuclei
• Thermal effects on the Fission Barrier of neutron-rich nuclei

Cited by in corpus (7)

• Alpha-decay half-lives and Q_alpha values of superheavy nuclei
• Excitation energy dependence of fission in the mercury region
• Systematic Study of Fission Barriers of Excited Superheavy Nuclei
• Nuclear deformation at finite temperature
• Potential energy surfaces of actinide and transfermium nuclei from multi-dimensional constraint covariant density functional theories
• Microscopic description of neutron emission rates in compound nuclei
• Microscopic Description of Induced Fission