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The interplay between quadrupole and octupole degrees of freedom is discussedin 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 staticHartree-Fock-Bogoliubov approach, dynamical beyond-mean-field correlations aretaken into account via both parity restoration and symmetry-conservingGenerator Coordinate Method calculations based on the Gogny-D1M energy densityfunctional. Physical properties such as correlation energies, negative-parityexcitation energies as well as reduced transition probabilities $B(E1)$ and$B(E3)$ are discussed in detail. It is shown that, for the studied nuclei, thequadrupole-octupole coupling is weak and to a large extent the properties ofnegative parity states can be reasonably well described in terms of theoctupole degree of freedom alone.

Microscopic description of quadrupole-octupole coupling in neutron-rich actinides and superheavy nuclei with the Gogny-D1M energy density functional