Abstract
The energies of the odd-spin negative parity bands are interpreted as the lowest eigenvalues of a quadrupole-octupole Hamiltonian in a space which is the direct product of the ground band and one octupole phonon spaces. The ground band states are obtained by the projection technique from a coherent state. Alternatively the negative parity levels are treated perturbatively. Applications to 150Sm, 152Gd and 238U show a good agreement with experiment. Also the BE1/BE2 ratios are estimated and compared with the available data.
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