Quadrupoleoctupole coupling and the evolution of collectivity in neutrondeficient Xe, Ba, Ce, and Nd isotopes
Abstract
The evolution of quadrupole and octupole collectivity in neutrondeficient Xe, Ba, Ce, and Nd nuclei near the "octupole magic" neutron number N =56 is investigated within the mapped s d f IBM framework. Microscopic input is obtained via quadrupole and octupole constrained HartreeFockBogoliubov calculations, based on the parametrization D1M of the Gogny energy density functional. Octupoledeformed meanfield ground states are predicted for Ba and Ce isotopes near N =56 . Excitation energies of positive and negativeparity states as well as electric transition rates are computed with wave functions resulting from the diagonalization of the mapped IBM Hamiltonian. The parameters of the Hamiltonian are determined via the mapping of the meanfield potential energy surfaces onto the expectation value of the Hamiltonian in the condensate state of the s , d , and f bosons. Enhanced octupolarity is predicted for Xe, Ba, and Ce isotopes near N =56 . The shape/phase transition from octupoledeformed to strongly quadrupoledeformed near N =60 is analyzed in detail.
 Publication:

Physical Review C
 Pub Date:
 November 2021
 DOI:
 10.1103/PhysRevC.104.054320
 arXiv:
 arXiv:2111.15403
 Bibcode:
 2021PhRvC.104e4320N
 Keywords:

 Nuclear Theory;
 Nuclear Experiment
 EPrint:
 13 pages, 13 figures, 1 table. arXiv admin note: text overlap with arXiv:2106.04076