Cross-shell excitations in doubly magic 132Sn and its nearest neighbours

TL;DR

This study uses large-scale shell model calculations with a new cross-shell interaction to accurately reproduce the excitation spectra and transition probabilities of doubly magic 132Sn and its neighbors, providing new insights into nuclear structure.

Contribution

First full-scale shell model analysis of 132Sn spectra and transition probabilities using a newly constructed interaction tuned for this mass region.

Findings

Accurately reproduced excitation spectra of 132Sn and neighbors.

Successfully calculated E1 transition probabilities beyond previous scope.

Demonstrated the effectiveness of the new cross-shell interaction.

Abstract

Large scale shell model calculations have been performed to study the excitation spectra of 132Sn and its nearest neighbours with a new cross-shell interaction constructed from two widely used interactions, sn100pn and CWG, of this mass region. A few of the two-body matrix elements have been tuned to reproduce the low-lying multiplet states of 132Sn. This is the first full scale shell model study of 132Sn energy spectra as well as transition probabilities. The excitation spectra for other nearest neighbours are reproduced reasonably well. The most important observable calculated are the E1 transition probabilities, which were so far beyond the scope of calculations with the existing interactions.