Systematics of fine structure in the α decay of deformed even-even nuclei

We present detailed systematics of the results for α transitions to excited 2+, 4+, and 6+ states in the α decay of deformed even-even nuclei. Both the semiclassical and coupled-channel results are analyzed in the valence nucleon scheme. This provides a good test of the reliability of the various theoretical models for the α-decay fine structure. It is found that the coupled-channel results agree well with the experimental data in both systematic behavior and magnitude, while the semiclassical results have relatively large deviations from the experimental data. This confirms the good reliability of the coupled-channel studies.