New Description of the Doublet Bands in Doubly Odd Nuclei

TL;DR

This paper introduces a new collective interpretation of doublet bands in odd-odd nuclei using an extended Interacting Vector Boson Model, successfully applying it to nuclei around mass 130 and comparing predictions with experimental data.

Contribution

It presents a novel orthosymplectic extension of the IVBM that provides a collective understanding of doublet bands in odd-odd nuclei.

Findings

The model accurately predicts energy levels of doublet bands.

Transition probabilities match experimental data.

The approach is applicable to nuclei in the $A extasciimath{\sim} 130$ region.

Abstract

The experimentally observed $\Delta I = 1$ doublet bands in some odd-odd nuclei are analyzed within the orthosymplectic extension of the Interacting Vector Boson Model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. It is illustrated by its application to three odd-odd nuclei from the $A\sim 130$ region, namely $^{126}Pr$, $^{134}Pr$ and $^{132}La$. The theoretical predictions for the energy levels of the doublet bands as well as $E2$ and $M1$ transition probabilities between the states of the yrast band in the last two nuclei are compared with experiment and the results of other theoretical approaches. The obtained results reveal the applicability of the orthosymplectic extension of the IVBM.