2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82329The phase structure of a two-fluid bosonic system is investigated. The proton-neutron interacting boson model (IBM-2) posesses a rich phase structure involving three control parameters and multiple order parameters. The surfaces of quantum phase transition between spherical, axially-symmetric deformed, and SU*(3) triaxial phases are determined.RevTeX 4, 4 pages, as published in Phys. Rev. LettNuclear Theorytext