Signatures of shape transition in odd-A neutron-rich Rubidium isotopes

TL;DR

This paper investigates shape transitions in odd-A neutron-rich Rubidium isotopes using a self-consistent Hartree-Fock-Bogoliubov approach, revealing clear signatures at N=60 in charge radii and ground state spin-parity, consistent with experimental data.

Contribution

It demonstrates the effectiveness of combining charge radii and spin-parity analysis to identify shape transitions in neutron-rich isotopes, providing a predictive tool for new regions of shape change.

Findings

Sharp shape transition at N=60 in charge radii

Ground state spin-parity changes at N=60

Results are consistent with experimental data

Abstract

The isotopic evolution of the ground-state nuclear shapes and the systematics of one-quasiproton configurations are studied in odd-A Rubidium isotopes. We use a selfconsistent Hartree-Fock-Bogoliubov formalism based on the Gogny energy density functional with two parametrizations, D1S and D1M, and implemented with the equal filling approximation. We find clear signatures of a sharp shape transition at N=60 in both charge radii and spin-parity of the ground states, which are robust, consistent to each other, and in agreement with experiment. We point out that the combined analysis of these two observables could be used to predict unambiguously new regions where shape transitions might develop.