Disentangling phase transitions and critical points in the proton-neutron interacting boson model by catastrophe theory

摘要

We introduce the basic concepts of catastrophe theory needed to derive analytically the phase diagram of the proton-neutron interacting boson model (IBM-2). Previous studies [1-3] were based on numerical solutions. We here explain the whole IBM-2 phase diagram including the precise order of the phase transitions in terms of the cusp catastrophe. © 2014 The Authors.