A unified description of shape coexistence and mixed-symmetry states in ⁹⁸Mo using IBM-2

Abstract

Level structure and electromagnetic transitions in 98Mo have been investigated on the basis of the proton-neutron interacting boson model (IBM-2) by considering the energy difference between neutron boson εν and proton boson επ. The results are compared with the recent experimental data and it is observed that they are in good agreement. In particular, the strongest M1 transition from state to can be well reproduced, from which one can determine the as an mixed-symmetry (MS) state. We have calculated the electric monopole strength , and our result agrees with the experimental one. The calculation indicates that shape coexistence and MS states are simultaneously well described using IBM-2.

Shape coexistence in 76Se within the neutron–proton interacting boson model

“…K Nomura et al studied the structural evolution in selenium nuclei by means of the mapped IBM based on the Gogny energy density functional [2]. In this paper, we extend our previous studies of IBM-2 on the shape coexistence to 76 Se nucleus [31][32][33][34][35][36][37][38][39][40][41], and extract the associated signatures of shape coexistence by analyzing the lowlying level scheme and M1 transition transition rates in addition to E2 transitons. We expect to improve the description of + 0 2 state in the framework of IBM-2 which is important for the shape coexistence.…”