Positive and negative parity dipole bands in 226Ra

The extended coherent state model (ECSM) is further extended in order to describe two dipole bands, one of positive and one of negative parity. As a result ECSM provides a consistent description of eight rotational bands, four of positive and four of negative parity. Signatures for static octupole deformation are pointed out in the new bands. Interesting features concerning the decay properties of the two bands are found out. For illustration the formalism was applied to 226Ra and the results are compared with the corresponding available data.