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Quadrupole and octupole deformation energy surfaces, low-energy excitationspectra, and electric transition rates in eight neutron-rich isotopic chains --Ra, Th, U, Pu, Cm, Cf, Fm, and No -- are systematically analyzed using aquadrupole-octupole collective Hamiltonian model, with parameters determined byconstrained reflection-asymmetric and axially-symmetric relativistic mean-fieldcalculations based on the PC-PK1 energy density functional. The theoreticalresults of low-lying negative-parity bands, odd-even staggering, averageoctupole deformations $\langle\beta_3\rangle$, and $B(E3; 3^-_1\to 0^+_1)$ showevidence of a shape transition from nearly spherical to stableoctupole-deformed, and finally octupole-soft equilibrium shapes in theneutron-rich actinides. A microscopic mechanism for the onset of stableoctupole deformation is also discussed in terms of the evolution ofsingle-nucleon orbitals with deformation.

Microscopic analysis of octupole shape transitions in neutron-rich actinides with relativistic energy density functional