Superfluid fission dynamics with microscopic approaches

C Simenel,A S Umar,D Lacroix,G Scamps,A Andreev,A Vdovin,S Ershov,V Sargsyan,N Arsenyev

doi:10.1051/epjconf/201610707001

Abstract

Recent progresses in the description of the latter stage of nuclear fission are reported. Dynamical effects during the descent of the potential towards scission and in the formation of the fission fragments are studied with the time-dependent Hartree-Fock approach with dynamical pairing correlations at the BCS level. In particular, this approach is used to compute the final kinetic energy of the fission fragments. Comparison with experimental data on the fission of 258Fm are made.

Highlights

Dynamical effects during the descent of the potential towards scission and in the formation of the fission fragments are studied with the time-dependent Hartree-Fock approach with dynamical pairing correlations at the BCS level
Despite important progresses since the discovery of nuclear fission in 1939 [1, 2], it remains an important challenge for theorists
The dynamics of the fission process in 258,264Fm has been investigated near scission at the mean-field level with the time-dependent Hartree-Fock approach including dynamical pairing correlations

Summary

Introduction

Despite important progresses since the discovery of nuclear fission in 1939 [1, 2], it remains an important challenge for theorists. Compared with other nuclear dynamical processes such as fusion, the overall time-scale for fission is relatively long. This suggests that the evolution across the potential energy surface is a slow process. The shape evolution near scission is expected to be non-adiabatic and the approximation may break down in the latter stage of fission [4, 5]. The dynamical effects near scission are crucial. It is shown that dynamics has an important effect on the scission configuration and on the kinetic and excitation energies of the fragments. Quantum shell effects are shown to play a crucial role in the dynamics and formation of the fragments

Adiabatic calculations

Conclusions