We offer to your attention a preprint “High-Spin States of Yrast-Bands Even Isotopes Pu, Cm, Fm, No” P4-2021-4 published by the JINR Publishing Department. The authors are Efimov A. D., Izosimov I. N.

In some isotopes of Pu, Cm, Fm, No, the yrast-band state energies are experimentally known up to the spin 32⁺, like this holds in ²⁴⁸Cm. What is unique is that all the states of these superlong bands remain purely collective. Collectivity of the bands manifests itself in the fact that the band state energies are reproduced with a high degree of accuracy within the framework of the phenomenology of the IBM1. The uncertainty of the model parameters is reduced under condition that the depth of the deformation energy obtained on the basis of realistic interactions was equal to the deformation energy depth in the internal state, calculated with the found parameters of the IBM1 Hamiltonian.

The investigation has been performed at the Flerov Laboratory of Nuclear Reactions of JINR.

Sent to Nuclear Physics journal.

Read the full version (in Russian)