title: Phase diagram of the proton-neutron interacting boson model.
abstract: We study the phase diagram of the proton-neutron interacting boson model with special emphasis on the phase transitions leading to triaxial phases. The existence of a new critical point between spherical and triaxial shapes is reported.
authors.affiliation: Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain.
authors.forename: J M
authors.initials: JM
authors.lastname: Arias
authors.forename: J E
authors.initials: JE
authors.lastname: García-Ramos
authors.forename: J
authors.initials: J
authors.lastname: Dukelsky