Similarity of nuclear structure in 132Sn and 208Pb regions: proton-neutron multiplets

TL;DR

This study investigates the similarity of proton-neutron multiplets in the 132Sn and 208Pb regions using shell-model calculations, revealing persistent analogies and emphasizing core polarization effects.

Contribution

It provides a detailed shell-model analysis of nuclei near 132Sn and 208Pb, demonstrating the extent of their structural similarity with effective interactions derived from the CD-Bonn potential.

Findings

Calculated results agree well with experimental data

Similarity between regions persists across nuclei studied

Core polarization effects are significant in the analogy

Abstract

Starting from the striking similarity of proton-neutron multiplets in 134Sb and 210Bi, we perform a shell-model study of nuclei with two additional protons or neutrons to find out to what extent this analogy persists. We employ effective interactions derived from the CD-Bonn nucleon-nucleon potential renormalized by use of the V-low-k approach. The calculated results for 136Sb, 212Bi, 136I, and 212At are in very good agreement with the available experimental data. The similarity between 132Sn and 208Pb regions is discussed in connection with the effective interaction, emphasizing the role of core polarization effects.