Realistic shell model and nuclei around 132Sn

A Gargano,G De Gregorio

doi:10.1051/epjconf/202023204006

Abstract

This contribution reports on a shell-model study of nuclei in the 132Sn region employing a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential renormalized through the use of the Vlow−k approach. We shall focus on some selected results for nuclei with a few valence particles and/or holes with respect to 132Sn, namely Sn isotopes with N > 82 and 130Te, which have, in part, been discussed in previous papers. Results are compared with experiments, and predictions that may provide guidance to future experiments are also discussed. It is the aim of this contribution to underline the importance of studying 132Sn neighbours to acquire a deep understanding of nuclear structure, that may be very useful also in other physics fields, and to show that the realistic shell model is a very effective tool to conduct these studies.

Highlights

During the last decade, nuclei in the mass region of 132Sn have been the subject of extensive experimental studies and new spectroscopic data have been made available, there are still some open questions, whose answer certainly requires further investigations.The robustness of the N = 82 shell closure has been clearly shown by the mass measurement of [1], transfer reactions experiments [2] illustrating the single-particle nature of the levels in 133Sn, as well as by other experimental results.Nuclei around 132Sn represent a crucial opportunity to investigate the evolution of the shell structure around a heavy, neutron rich doubly-closed shell nucleus far-off stability
The effective interaction is derived starting from the high precision CD-Bonn NN potential [21], renormalized by means of the Vlow−k approach, with Λ = 2.2 and 2.6 fm−1 for Sn isotopes and 130Te, respectively
This region is of great interest for studying the evolution of the shell structure - and how it is driven by the underlying nuclear forces - around a heavy, neutron-rich doubly closed-shell nucleus far off stability

Summary

Introduction

Nuclei in the mass region of 132Sn have been the subject of extensive experimental studies and new spectroscopic data have been made available, there are still some open questions, whose answer certainly requires further investigations. In the light- and medium-mass regions, structural changes have been evidenced for nuclei with a large excess of neutrons, leading to the breakdown of the traditional magic numbers and the appearance of new ones. These findings have driven a great theoretical effort to understand the microscopic mechanism underlying the shell evolution, with special attention to the role of the different components of the nuclear force (see, for instance, [5]). It is of great interest to verify if peculiar properties, as those observed in lighter nuclei, may be observed in the 132Sn region

Objectives

Results

Conclusion