  The coherent state model (CSM) is extended so that three negative parity
bands are treated on equal footing with three positive parity bands. The six
rotational bands are generated by projecting out angular momenta and parities
from three intrisic orthogonal states which exhibit both quadrupole and
octupole deformations. The projected states are, by construction, mutually
orthogonal. In the space of projected states, a sub-space of a quadrupole and
octupole multi-boson states, an effective quadrupole and octupole boson
Hamiltonian is solved. The eigenstates of the model Hamiltonian are linked by
multipole transition operators for which lowest order boson expressions are
considered. The calculations involve 6 structure coefficients and two
deformation parameters. All of them are fixed by a least square fit of the
known experimental energies. Applications are made to Gd158, Yb172, Ra218,
Ra226, Th232, U238, Pu238. Very good agreement is obtained for both excitation
energies and transition probabilities. New signatures for octupole deformation,
manifested in excited bands, are pointed out.
