title: Phase structure of the two-fluid proton-neutron system.
abstract: The phase structure of a two-fluid bosonic system is investigated. The proton-neutron interacting boson model possesses 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(*)(pinu)(3) triaxial phases are determined.
authors.affiliation: Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520-8120, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Caprio
authors.forename: F
authors.initials: F
authors.lastname: Iachello