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The interplay between the collective dynamics of the quadrupole and octupoledeformation degree of freedom is discussed in a series of Sm and Gd isotopesboth at the mean field level and beyond, including parity symmetry restorationand configuration mixing. Physical properties like negative parity excitationenergies, E1 and E3 transition probabilities are discussed and compared toexperimental data. Other relevant intrinsic quantities like dipole moments,ground state quadrupole moments or correlation energies associated to symmetryrestoration and configuration mixing are discussed. For the consideredisotopes, the quadrupole-octupole coupling is found to be weak and most of theproperties of negative parity states can be described in terms of the octupoledegree of freedom alone.

Microscopic description of quadrupole-octupole coupling in Sm and Gd isotopes with the Gogny Energy Density Functional