2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109188We 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. \6 pages, 6 figures, published versionNuclear TheoryStatistical Mechanicstext