Effects of triaxiality and pairing interaction on fission barriers of actinide nuclei studied by density-dependence relativistic mean-field theory

TL;DR

This study uses density-dependent relativistic mean-field theory to analyze how triaxiality and pairing interactions influence the inner fission barriers of actinide nuclei, improving theoretical-experimental agreement.

Contribution

It demonstrates that adjusting pairing strength within the model effectively reproduces experimental fission barriers and related nuclear properties.

Findings

Triaxiality reduces inner fission barriers.

Adjusting pairing strength improves agreement with experiments.

Discrepancies of 1-2 MeV can be minimized by pairing adjustments.

Abstract

We employ density-dependent relativistic mean-field theory to study how the triaxiality and pairing interaction affect the inner fission barriers of actinide nuclei. It was found that triaxiality reduced the inner fission barriers and improved agreement with experimental values for many actinides. However, about 1-2 MeV discrepancy to the experimental values still remained for some of the considered nuclei. Such a discrepancy could be made further smaller by increasing the BCS pairing strength parameter. In this work, we demonstrated that adjusting the paring strength was effective to reproduce the experimental inner fission barriers as well as "pairing rotational energy" and binding energy in a consistent manner for nuclei where the effect of the triaxiality on the inner fission barriers was significant.