Parity restoration in the Highly Truncated Diagonalization Approach: application to the outer fission barrier of $^{240}$Pu

TL;DR

This paper introduces a method to restore parity symmetry within the Highly Truncated Diagonalization Approach, applied to analyze the outer fission barrier of $^{240}$Pu, revealing effects on barrier height and fission lifetime.

Contribution

It develops a parity restoration technique in the HTDA framework and applies it to $^{240}$Pu, showing how symmetry breaking influences fission barrier calculations.

Findings

Parity restoration increases the outer fission barrier height by about 350 keV.

The $K^{ extpi} = 0^+$ fission isomeric state is unstable against parity-breaking modes.

Projection does not alter the energy at the top of the outer fission barrier.

Abstract

The restoration of the parity symmetry has been performed in the framework of the Highly Truncated Diagonalization Approach suited to treat correlations in an explicitly particle-number conserving microscopic approach. To do so we have assumed axial symmetry and used a generalized Wick's theorem due to L\"owdin in a projection-after-variation scheme. We have chosen the Skyrme SkM$^*$ energy-density functional for the particle-hole channel and a density-independent delta force for the residual interaction. We have applied this approach in the region of the outer fission barrier of the $^{240}$Pu nucleus. As a result, we have shown that the $K^{\pi} = 0^+$ fission isomeric state is statically unstable against intrinsic-parity breaking modes, while the projection does not affect the energy at the top of the intrinsic outer fission barrier. Altogether, this leads to an increase of the height of the outer fission barrier--with respect to the fission isomeric state--by about 350 keV, affecting thus significantly the fission-decay lifetime of the considered fission isomer.