Evolution of octupole deformation and collectivity in neutron-rich lanthanides Nomura, K. García Ramos, J. E. This work has been supported by the Tenure Track Pilot Programme of the Croatian Science Foundation and the Ecole Polytechnique Federale de Lausanne, and the Project TTP-2018-07-3554 Exotic Nuclear Structure and Dynamics, with funds of the Croatian-Swiss Research Programme. The work of LMR was supported by Spanish Ministry of Economy and Competitiveness (MINECO) Grant No. PGC2018-094583-B-I00. The work of JEGR has been partially supported by the Ministerio de Ciencia e Innovacion (Spain) under projects number PID2019-104002GB-C21, by the Conse-jeria de Economia, Conocimiento, Empresas y Universidad de la Junta de Andalucia (Spain) under Group FQM-370, by the European Regional Development Fund (ERDF) , ref. SOMM17/6105/UGR, and by the European Commission, ref. H2020-INFRAIA-2014-2015 (ENSAR2) . Resources sup-porting this work were provided by the CEAFMC and the Universidad de Huelva High Performance Computer (HPC@UHU) funded by ERDF/MINECO project UNHU-15CE-2848. 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. 2021-11-16T09:44:02Z 2021-11-16T09:44:02Z 2021-10-21 info:eu-repo/semantics/article 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] http://hdl.handle.net/10481/71548 10.1103/PhysRevC.104.044324 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Atribución-NoComercial-SinDerivadas 3.0 España American Physical Society