Fission modes of 256Fm and 258Fm in a microscopic approach

Abstract

A static microscopic study of potential-energy surfaces within the Skyrme-Hartree-Fock-plus-BCS model is carried out for the 256Fm and 258Fm isotopes with the goal of deducing some properties of spontaneous fission. The calculated fission modes are found to be in agreement with the experimentaly observed asymmetric-to-symmetric transition in the fragment-mass distributions and with the high- and low-total-kinetic-energy modes experimentally observed in 258Fm. Most of the results are similar to those obtained in macroscopic-microscopic models as well as in recent Hartree-Fock-Bogolyubov calculations with the Gogny interaction, with a few differences in their interpretations. In particular an alternative explanation is proposed for the low-energy fission mode of 258Fm.

14 pages, 11 figures, 3 tables, submitted to Phys. Rev. C

Cited by in corpus (6)

• Microscopic description of complex nuclear decay: multimodal fission
• Structure properties of ${}^{226}$Th and ${}^{256,258,260}$Fm fission fragments: mean field analysis with the Gogny force
• Primary fission fragment mass yields across the chart of nuclides
• Global microscopic calculations of ground-state spin and parity for odd-mass nuclei
• Origin of the narrow, single peak in the fission-fragment mass distribution for ${}^{258}$Fm
• Multimodal fission from self-consistent calculations