Pecularities of rotation bands in heavy and superheavy nuclei

Publications, 20 February 2023

We offer to your attention a preprint “Pecularities of Rotation Bands in Heavy and Superheavy Nuclei. Description of Yrast-Band States in 248Cm” P4-2022-50 published by the JINR Publishing Department. The authors are Efimov A. D., Izosimov I. N.

A further development of the expanded microscopic version of the IBM is presented by considering two-quasiparticle phonons with multipolarity up to J = 14+. The developed theoretical scheme is applied to describe the properties of the yrast-band states in 248Cm up to spins 34+. This heavy nucleus is the only nucleus in this mass region where the values of B(E2) up to spin I = 28+ are measured. This is why it is considered foremost, since this information allows us to test the presented theoretical scheme based on a larger volume of experimental data. The region of transactinide nuclei differs from lighter ones by the absence of the effect of the back bending in the moment of inertia dependence on the square of the rotation frequency up to the spin I = 34+. This article is intended in particular to find out the reason for this effect. Peculiar properties of the rotation bands in heavy and superheavy nuclei are discussed.

The investigation has been performed at the Flerov Laboratory of Nuclear Reactions. Submitted to the Nuclear Physics journal.