Fission fragment properties from a microscopic approach with the Gogny force.

Potential energy surfaces are calculated in the elongation-asymmetry plane, with nuclear shapes ranging from sphericity to very large deformations, using the Hartree-Fock-Bogoliubov method and the Gogny nucleon-nucleon effective interaction (parameterization D1S), for the 226Th and 256,258,260Fm Fissioning systems. In order to discriminate between pre- and post-scission configurations, we define a criterion based on the nuclear density. Using this criterion, a big number of scission configurations are identified, and several fragment properties are extracted from them, namely fragment deformations, deformation energies, energy partitioning, neutron binding energies at scission, charge polarization, total fragment kinetic energies and neutron emission multiplicities. [ABSTRACT FROM AUTHOR]