Simultaneous Description of Even-Even, Odd-Mass and Odd-Odd Nuclear Spectra

TL;DR

This paper extends the Interacting Vector Boson Model using orthosymplectic symmetry to simultaneously describe spectra of even-even, odd-mass, and odd-odd nuclei, showing good agreement with experimental data.

Contribution

It introduces an orthosymplectic extension of the IVBM for unified nuclear spectra description, incorporating fermion-boson coupling in a self-consistent manner.

Findings

Accurately predicts low-lying spectra for neighboring nuclei.

Demonstrates applicability of the dynamical symmetry used.

Shows good agreement with experimental data.

Abstract

The orthosymplectic extension of the Interacting Vector Boson Model (IVBM) is used for the simultaneous description of the spectra of different families of neighboring heavy nuclei. The structure of even-even nuclei is used as a core on which the collective excitations of the neighboring odd-mass and odd-odd nuclei are built on. Hence, the spectra of the odd-mass and odd-odd nuclei arise as a result of the consequent and self-consistent coupling of the fermion degrees of freedom of the odd particles, specified by the fermion sector $SO^{F}(2\Omega)\subset OSp(2\Omega/12,R)$, to the boson core which states belong to an $Sp^{B}(12,R)$ irreducible representation. The theoretical predictions for different low-lying collective bands with positive and negative parity for two sets of neighboring nuclei with distinct collective properties are compared with experiment and IBM/IBFM/IBFFM predictions. The obtained results reveal the applicability of the used dynamical symmetry of the model.