Symmetry considerations on the fission isomer spectra

Summary

Spectroscopic properties of²³⁶U and²³⁶U fission isomers are interpreted in the frame of the SU₃ limit of the interaeting-boson model. The number of valence bosons has been estimated on the basis of microscopic Nilsson-Bardeen-Cooper-Schrieffer calculations, carried out at realistic deformations. Levels of the ground-state,β andγ bands are obtained together withE2 transitions. The results for^238mU are compared with those derived by means of the extended rotation-vibration model.