Investigation of shape coexistence in 118-128Te isotopes

TL;DR

This study explores shape coexistence and phase transitions in 118-128Te isotopes using an affine Lie algebra-based interacting boson model, successfully reproducing experimental transition rates and revealing links between configuration mixing and nuclear deformations.

Contribution

It introduces a transitional IBM Hamiltonian based on affine Lie algebra to describe shape evolution and configuration mixing in Te isotopes, advancing understanding of nuclear shape coexistence.

Findings

Accurately reproduces excitation energies and transition rates.

Shows a correlation between configuration mixing ratio and nuclear deformations.

Identifies the role of SO(6) limit in shape evolution.

Abstract

In this paper, we have considered the interplay between phase transitions and configuration mixing of intruder excitations in the 118-128Te isotopes. A transitional interacting boson model Hamiltonian in both IBM-1 and IBM-2 versions which are based on affine Lie Algebra are employed to describe the evolution from spherical to deformed gamma unstable shapes along the chain of Te isotopes. The excitation energies, B(E0) and B(E2) transition rates are rather well reproduced in comparison with experimental counterparts when the weight of SO(6) limit is increased in Hamiltonian. Also our results show obvious relations between the configuration mixing ratio and quadrupole, hexadecapole and hexacontatetrapole deformation values in this isotopic chain.