Particle-particle random phase approximation applied to Beryllium isotopes

TL;DR

This paper applies the particle-particle Random Phase Approximation to study even-even Beryllium isotopes, improving energy and amplitude predictions by including two-body correlations, and compares results with experimental data.

Contribution

It introduces a model that accounts for two-body correlations in the core nucleus, providing a more accurate description of Beryllium isotopes than previous models.

Findings

Better energy and amplitude predictions compared to simpler models.

Evidence of shell inversion in 13Be similar to 11Be.

Agreement with experimental data on ground and excited states.

Abstract

This work is dedicated to the study of even-even 8-14 Be isotopes using the particle-particle Random Phase Approximation that accounts for two-body correlations in the core nucleus. A better description of energies and two-particle amplitudes is obtained in comparison with models assuming a neutron closed-shell (or subshell) core. A Wood-Saxon potential corrected by a phenomenological particle-vibration coupling term has been used for the neutron-core interaction and the D1S Gogny force for the neutron-neutron interaction. Calculated ground state properties as well as excited state ones are discussed and compared to experimental data. In particular, results suggest the same 2s_1/2-1p_1/2 shell inversion in 13Be as in 11Be.