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Abstract
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 IBM microscopic version are presented, in which high-spin excitation modes are also considered. For other nuclei, in cases where high-spin orbits are not so significant in describing the properties of yrast bands, in addition to the Harris model, IBM with a full standard Hamiltonian constructed only from s, d bosons is utilized. Since 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. The study of the properties of nuclei in various models will reveal the possibilities of describing different behavior of the moments of inertia in IBM and outline additional criteria for the implementation of band crossing
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