Hartree-Fock-Bogoliubov study of quantum shell effects on the path to fission in ${}^{180}$Hg, ${}^{236}$U and ${}^{256}$Fm

Abstract

Quantum shell effects stabilising fission fragments with various shapes have been invoked as a factor determining the distribution of nucleons between the fragments at scission. Shell effects also induce asymmetric shapes in the nucleus on its way to fission well before the final fragments are (pre)formed. These shell effects are studied in fission of ${}^{180}$Hg, ${}^{236}$U and ${}^{256}$Fm with constrained Hartree-Fock-Bogoliubov calculations using the D1S parametrisation of the Gogny interaction. Strutinsky shell energy correction and single-particle energy level density near the Fermi surface are computed. Several neutron and proton shell effects are identified as drivers towards asymmetric fission. Shell effects are also used to identify the preformation of the fragments in the later stage of fission.

11 pages, 7 figures. References updated

References in corpus (6)

• Microscopic description of complex nuclear decay: multimodal fission
• Nuclear-fission studies with relativistic secondary beams: analysis of fission channels
• Excitation energy dependence of fission in the mercury region
• Multidimensionally-constrained relativistic mean-field study of triple-humped barriers in actinides
• Comparison of fission and quasi-fission modes
• Impact of tensor force on quantum shell effects in quasifission reactions

Cited by in corpus (3)

• Time-dependent Hartree-Fock study of quasifission trajectories in reactions forming ${}^{294}$Og
• Impact of octupole correlation on the inverse quasifission in ${}^{160}\text{Gd}+{}^{186}\text{W}$ collisions
• Shell effects in quasifission toward ${}^{180}\mathrm{Hg}$: insights into fission asymmetric modes