Structure properties of ${}^{226}$Th and ${}^{256,258,260}$Fm fission fragments: mean field analysis with the Gogny force

TL;DR

This paper uses the Hartree-Fock-Bogoliubov method with the Gogny force to analyze the potential energy surfaces and fragment properties of fissioning nuclei ${}^{226}$Th and ${}^{256,258,260}$Fm at large deformations, providing detailed insights into scission configurations.

Contribution

It introduces a comprehensive mean field analysis of fission fragments using the Gogny interaction, exploring a wide range of deformations and identifying various scission configurations.

Findings

Identification of multiple scission configurations from symmetric to asymmetric.

Calculation of fragment properties such as deformations, energies, and neutron multiplicities.

Analysis of energy partitioning and charge polarization at scission.

Abstract

The constrained Hartree-Fock-Bogoliubov method is used with the Gogny interaction D1S to calculate potential energy surfaces of fissioning nuclei ${}^{226}$Th and ${}^{256,258,260}$Fm up to very large deformations. The constraints employed are the mass quadrupole and octupole moments. In this subspace of collective coordinates, many scission configurations are identified ranging from symmetric to highly asymmetric fragmentations. Corresponding fragment properties at scission are derived yielding fragment deformations, deformation energies, energy partitioning, neutron binding energies at scission, neutron multiplicities, charge polarization and total fragment kinetic energies.