Spin scissors mode in actinides

The scissors mode structure is studied in the actinides within the Wigner Function Moments method. The theory predicts a splitting of the scissors mode into three branches due to spin degrees of freedom. The excitation energies and [Formula: see text] transition probabilities for the scissors states are calculated for even–even axial nuclei of the actinide mass region. The origin of the double-humped structure of the scissors spectrum observed in the lightest actinides is discussed. The energy centroids and integrated [Formula: see text] strengths for the transuranium nuclides up to [Formula: see text]No are predicted. The results of calculations for [Formula: see text]Th, [Formula: see text]U and [Formula: see text]No are compared with available experimental data.