Influence of band interaction on the spin prediction of superdeformed rotational bands

The influence of band interaction on the spin predictions and the J((2)) pa ttern of superdeformed (SD) bands are investigated. To make a reliable spin prediction using the best-fit method, the transitions with significant ban d mixing should be excluded from the least-squares fitting. Spin prediction s for 15 SD bands in the A similar to 150 region are made, in particular, t he spin of the lowest level of the first discovered high-spin SD band Dy-15 2(1) is predicted to be I-0 = 26. A two-band mixing model is used to descri be the irregular behaviour of J((2)) with angular momentum. Two types of J( (2)) patterns are discussed. For the band-crossing case, the J((2)) pattern in the band-crossing region is of a V (or inverse-V) type, which has been observed in both the A similar to 190 and 150 regions. For the band-mixing case characterized by a relatively weak band interaction, the J((2)) patter n in the band-mixing region is of a W (or inverse-W) type, which was observ ed only in some SD bands in the A similar to 150 region.