  The backbending in the A=180 mass region is expected to be caused by
multi-bands crossing between low-K (g- and s-bands) and high-K bands. % We
analyze a mechanism of coupling of these bands in terms of a dynamical
treatment for nuclear rotations, i.e., the wobbling motion. The wobbling states
are produced through the generator coordinate method after angular momentum
projection, in which the intrinsic states are constructed through the
2d-cranked HFB calculations.
