Maya Barbecho, EsperanzaGarcía Ramos, José Enrique2025-07-232025-07-232025-07-11Maya-Barbecho, E., & García-Ramos, J.-E. (2025). An intrinsic-state formalism for the Interacting Boson-Fermion Model with configuration mixing. Physics Letters B, 868, 139724. https://doi.org/10.1016/j.physletb.2025.139724https://hdl.handle.net/10272/27009In 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.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Interacting Boson-Fermion ModelConfiguration mixingIntrinsic-state formalismjournal article10.1016/j.physletb.2025.139724open access