Evolution of octupole deformation and collectivity in neutron-rich lanthanides

Nomura K. Rodriguez-Guzman R. Robledo L.M. García-Ramos J.E. Hernandez N.C. Hernandez N.C.
Physical Review C
Doi 10.1103/PhysRevC.104.044324
Volumen 104
Citas: 13
©2021 American Physical SocietyThe onset of octupole deformation and its impact on related spectroscopic properties is studied in even-even neutron-rich lanthanide isotopes Xe, Ba, Ce, and Nd with neutron number . Microscopic input comes from the Hartree-Fock-Bogoliubov approximation with constrains on the axially symmetric quadrupole and octupole operators using the Gogny-D1M interaction. At the mean-field level, reflection asymmetric ground states are predicted for isotopes with neutron number around . Spectroscopic properties are studied by diagonalizing the interacting boson model Hamiltonian, with the parameters obtained via the mapping of the mean-field potential energy surface onto the expectation value of the Hamiltonian in the , and boson condensate state. The results obtained for low-energy positive- and negative-parity excitation spectra as well as the electric dipole, quadrupole, and octupole transition probabilities indicate the onset of pronounced octupolarity for and nuclei.
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