Direct transitions from high-K isomers to low-K bands -- γ softness or coriolis coupling

Recent measurements of direct transitions from high-K isomers to low-K bands reveal severe break-down of the K-selection rule and pose the problem of how to understand the mechanism of such K-violation. The authors recent systematic calculations by using a simple γ-tunneling model reproduced many of the observed hindrances, indicating the importance of the γ softness. However, there are some data which cannot be explained in terms of the γ-degree of freedom. In this talk, the authors also discuss the results of conventional Coriolis coupling calculations, which is considered to be another important mechanism