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.

arXiv comment11 pages, 7 figures. References updated

References in corpus (24)

• Microscopic Theory of Nuclear Fission: A Review
• Mean field and beyond description of nuclear structure with the Gogny force: A review
• Review on the progress in nuclear fission
• Heavy-ions collisions and fission dynamics with the time-dependent Hartree-Fock theory and its extensions
• Future of Nuclear Fission Theory
• Formation and dynamics of fission fragments
• Fission half-lives of super-heavy nuclei in a microscopic approach
• Microscopic description of complex nuclear decay: multimodal fission
• Theory of Nuclear Fission
• Nuclear-fission studies with relativistic secondary beams: analysis of fission channels
• Effect of shell structure on the fission of sub-lead nuclei
• Spontaneous fission lifetimes from the minimization of self-consistent collective action
• Numerical search of discontinuities in self-consistent potential energy surfaces
• Excitation energy dependence of fission in the mercury region
• From Asymmetric to Symmetric Fission in the Fermium Isotopes within the Time-Dependent GCM Formalism
• Multidimensionally-constrained relativistic mean-field study of triple-humped barriers in actinides
• Deformed shell effects in ${}^{48}$Ca+${}^{249}$Bk quasifission fragments
• Third minima in actinides - do they exist?
• Comparison of fission and quasi-fission modes
• The character and prevalence of third minima in actinide fission barriers
• Description of the multidimensional potential energy surface in fission of ${}^{252}$Cf and ${}^{258}$No
• Impact of tensor force on quantum shell effects in quasifission reactions
• Description of the asymmetric to symmetric fission transition in the neutron-deficient Thoriums -- Role of the tensor force
• Smoothing of one- and two-dimensional discontinuities in potential energy surfaces

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• Shell Effects in Quasi-fission in Reactions Forming 226Th Compound Nucleus
• Nuclear Quantum Many-Body Dynamics: From Collective Vibrations to Heavy-Ion Collisions (2nd edition)
• Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes
• Multimodality of ${}^{187}$Ir fission studied by Langevin approach
• Multimodal fission from self-consistent calculations
• 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
• The Quest for Superheavy Nuclei: A Theoretical Perspective