  The interplay between quadrupole and octupole degrees of freedom is discussed
in a series of neutron-rich actinides and superheavy nuclei with $92 \le$ Z
$\le 110$ and $186 \le$ N $\le 202$. In addition to the static
Hartree-Fock-Bogoliubov approach, dynamical beyond-mean-field correlations are
taken into account via both parity restoration and symmetry-conserving
Generator Coordinate Method calculations based on the Gogny-D1M energy density
functional. Physical properties such as correlation energies, negative-parity
excitation energies as well as reduced transition probabilities $B(E1)$ and
$B(E3)$ are discussed in detail. It is shown that, for the studied nuclei, the
quadrupole-octupole coupling is weak and to a large extent the properties of
negative parity states can be reasonably well described in terms of the
octupole degree of freedom alone.
