  Within the cranked Skyrme-Hartree-Fock approach the self-consistent solutions
have been obtained for planar and chiral rotational bands in 132La. It turns
out that the chiral band cannot exist below some critical rotational frequency
which in the present case equals omega=0.6MeV. The appearance of the critical
frequency is explained in terms of a simple classical model of two gyroscopes
coupled to a triaxial rigid body.
