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

Abstract

The quadrupole-octupole coupling and the related spectroscopic properties have been studied for the even-even light actinides ${}^{218-238}$Ra and ${}^{220-240}$Th. The Hartree-Fock-Bogoliubov approximation, based on the Gogny-D1M energy density functional, has been employed as a microscopic input, i.e., to obtain (axially symmetric) mean-field potential energy surfaces as functions of the quadrupole and octupole deformation parameters. The mean-field potential energy surfaces have been mapped onto the corresponding bosonic potential energy surfaces using the expectation value of the $sdf$ Interacting Boson Model (IBM) Hamiltonian in the boson condensate state. The strength parameters of the $sdf$-IBM Hamiltonian have been determined via this mapping procedure. The diagonalization of the mapped IBM Hamiltonian provides energies for positive- and negative-parity states as well as wave functions which are employed to obtain transitional strengths. The results of the calculations compare well with available data from Coulomb excitation experiments and point towards a pronounced octupole collectivity around ${}^{224}$Ra and ${}^{226}$Th.

arXiv comment15 pages, 10 figures, 1 table

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Cited by in corpus (12)

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• Octupole correlations in collective excitations of neutron-rich $N\approx 56$ nuclei
• Beyond-mean-field description of octupolarity in dysprosium isotopes with the Gogny-D1M energy density functional
• Mapped interacting boson model for nuclear structure studies
• Microscopic description of quadrupole-hexadecapole coupling in radium, thorium, uranium and plutonium isotopes with the Gogny energy density functional
• Simultaneous description of $\beta$ decay and low-lying structure of neutron-rich even- and odd-mass Rh and Pd nuclei
• Mapped $spdf$ interacting boson model for quadrupole-octupole collective states in nuclei
• Octupole correlation effects on two-neutron transfer intensity in rare-earth nuclei
• Impacts of hexadecapole correlations in actinide nuclei
• Octupole correlations in the excited $0^{+}$ states and two-neutron transfers in actinide nuclei