Evolution of octupole deformation and collectivity in neutron-rich lanthanides
MetadataShow full item record
Nomura, K... [et al.]. Evolution of octupole deformation and collectivity in neutron-rich lanthanides. PHYSICAL REVIEW C 104, 044324 (2021). [https://doi.org/10.1103/PhysRevC.104.044324]
SponsorshipTenure Track Pilot Programme of the Croatian Science Foundation; Ecole Polytechnique Federale de Lausanne; Spanish Ministry of Economy and Competitiveness (MINECO) PGC2018-094583-B-I00; Spanish Government PID2019-104002GB-C21; Consejeria de Economia, Conocimiento, Empresas y Universidad de la Junta de Andalucia (Spain) FQM-370; European Commission SOMM17/6105/UGR; European Commission; European Commission Joint Research Centre H2020-INFRAIA-2014-2015; ERDF/MINECO project UNHU-15CE-2848; Croatian-Swiss Research Programme TTP-2018-07-3554
The 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 86 <= N <= 94. 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 N = 88. 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 s, d, and f 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 Z approximate to 56 and N approximate to 88 nuclei.