On the impact of large amplitude pairing fluctuations on nuclear spectra

TL;DR

This paper explores how large amplitude pairing fluctuations affect nuclear spectra, showing their increasing importance at higher excitation energies and angular momenta using advanced symmetry conserving calculations.

Contribution

It introduces a novel approach incorporating pairing gap fluctuations as generator coordinates in symmetry conserving configuration mixing calculations for nuclei.

Findings

Pairing fluctuations significantly influence nuclear spectra at high energies.

Self-consistent basis state determination is crucial for accurate results.

Effects of pairing fluctuations grow with excitation energy and angular momentum.

Abstract

The influence of large amplitude pairing fluctuations is investigated in the framework of beyond mean field symmetry conserving configuration mixing calculations. In the numerical application the finite range density dependent Gogny force is used. We investigate the nucleus $^{54}$Cr with particle number and angular momentum projected wave functions considering the axial quadrupole deformation and the pairing gap degree of freedom as generator coordinates. We find that the effects of the pairing fluctuations increase with the excitation energy and the angular momentum. The self-consistency in the determination of the basis states plays an important role.