Quest for consistent modelling of statistical decay of the compound nucleus

TL;DR

This paper develops a comprehensive statistical model for heavy ion fusion-fission reactions, incorporating multiple nuclear effects to consistently explain experimental data on fission and residue formation.

Contribution

It introduces a unified model including shell effects, collective level density enhancement, and dissipation, resolving previous inconsistencies in fission hindrance and enhancement explanations.

Findings

The model successfully reproduces pre-scission neutron multiplicities.

It explains evaporation residue cross-sections without conflicting with neutron data.

Provides a consistent framework for nuclear fission modeling.

Abstract

A statistical model description of heavy ion induced fusion-fission reactions is presented where shell effects, collective enhancement of level density, tilting away effect of compound nuclear spin and dissipation are included. It is shown that the inclusion of all these effects provides a consistent picture of fission where fission hindrance is required to explain the experimental values of both pre-scission neutron multiplicities and evaporation residue cross-sections in contrast to some of the earlier works where a fission hindrance is required for pre-scission neutrons but a fission enhancement for evaporation residue cross-sections.