Description of the critical point symmetry in 124Te by IBM-2 * * Supported by the National Natural Science Foundation of China (11475062, 11147148, 11747312)

Abstract

Based on the neutron and proton degrees of freedom, low-lying energy levels, , , and transition strengths of nucleus 124Te have been calculated by the neutron-proton interacting boson model. The calculated results are reasonably consistent with the experimental data. By comparing the key observables of the states at the critical point of - transition with the experimental data and calculated results, we show that the 124Te is a possible nucleus at the critical point of the second-order phase transition from vibration to unstable rotation, and such a critical point exhibits slight triaxial rotation. The 0 state of 124Te can be interpreted as the lowest state of the first-excited family of the intrinsic levels in the critical point symmetry.