A scalar two-level boson model to study the IBM phase diagram in the Casten triangle

Abstract

We introduce a simple two-level boson model with the same energy surface as the Q-consistent Interacting Boson Model Hamiltonian. The model can be diagonalized for large number of bosons and the results used to check analytical finite-size corrections to the energy gap and the order parameter in the critical region. \

Comments: 6 pages, 6 figures, published version