An intrinsic-state formalism for the Interacting Boson-Fermion Model with configuration mixing

TL;DR

This paper develops an intrinsic state formalism for the Interacting Boson-Fermion Model that includes configuration mixing and applies it to transitional nuclear regions, revealing effects on quantum phase transitions.

Contribution

It introduces a new formalism for the IBFM with configuration mixing, applicable to various nuclear shapes and unpaired fermion configurations.

Findings

Formalism handles 0p-0h and 2p-2h configurations.

Application to transitional nuclear regions shows configuration effects.

Boson-fermion interactions influence quantum phase transitions.

Abstract

In this letter, we present the intrinsic state formalism of the Interacting Boson-Fermion Model incorporating both 0p-0h and 2p-2h (regular and intruder) configurations. The framework allows to deal with the unpaired fermion in either a single-j or multi-j orbital and is applicable to both axial and triaxial nuclear shapes. The formalism is applied to a schematic transitional region where regular and intruder configurations coexist and cross. We show that the boson-fermion part of the Hamiltonian can either enhance or suppress the emergence of a type II Quantum Phase Transition.