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The quadrupole-octupole coupling and the related spectroscopic propertieshave been studied for the even-even light actinides $^{218-238}$Ra and$^{220-240}$Th. The Hartree-Fock-Bogoliubov approximation, based on theGogny-D1M energy density functional, has been employed as a microscopic input,i.e., to obtain (axially symmetric) mean-field potential energy surfaces asfunctions of the quadrupole and octupole deformation parameters. The mean-fieldpotential energy surfaces have been mapped onto the corresponding bosonicpotential energy surfaces using the expectation value of the $sdf$ InteractingBoson Model (IBM) Hamiltonian in the boson condensate state. The strengthparameters of the $sdf$-IBM Hamiltonian have been determined via this mappingprocedure. The diagonalization of the mapped IBM Hamiltonian provides energiesfor positive- and negative-parity states as well as wave functions which areemployed to obtain transitional strengths. The results of the calculationscompare well with available data from Coulomb excitation experiments and pointtowards a pronounced octupole collectivity around $^{224}$Ra and $^{226}$Th.

Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional