Comparison of the descriptions of yrast bands in the Harris and IBM models for even Th and U nuclei

Abstract For even Th and U nuclei, the description of the energies of yrast bands in the Harris variable moment of inertia model is studied in its phenomenological application. For some of these nuclei, the results obtained in the microscopic version of the interacting boson model (IBM) are presented, in which high-spin excitation modes are also considered. For other nuclei, in scenarios where high-spin orbits are not highly significant in describing the properties of yrast bands, in addition to the Harris model, the IBM with a full standard Hamiltonian constructed only from s and d bosons is utilized. Because the Harris model is considered with no more than four parameters, it can be used for both heavy and superheavy nuclei to approximate the energies of high-spin states. This study on the properties of nuclei using various models reveals the possibilities of describing different behaviors of the moments of inertia in the IBM and outlines additional criteria for the implementation of band crossing.