Signatures of octupole correlations in neutronrich oddmass barium isotopes
Abstract
Octupole deformation and the relevant spectroscopic properties of neutronrich oddmass barium isotopes are investigated in a theoretical framework based on nuclear density functional theory and the particlecore coupling scheme. The interactingboson Hamiltonian that describes the octupoledeformed eveneven core nucleus, as well as the singleparticle energies and occupation probabilities of an unpaired nucleon, are completely determined by microscopic axially symmetric (β_{2},β_{3}) deformation constrained selfconsistent meanfield calculations for a specific choice of the energy density functional and pairing interaction. A bosonfermion interaction that involves both quadrupole and octupole degrees of freedom is introduced, and their strength parameters are determined to reproduce selected spectroscopic data for the oddmass nuclei. The model reproduces recent experimental results for both eveneven and oddmass Ba isotopes. In particular, for ^{Ba},147_{145} our results indicate, in agreement with recent data, that octupole deformation does not determine the structure of the lowest states in the vicinity of the ground state, and only becomes relevant at higher excitation energies.
 Publication:

Physical Review C
 Pub Date:
 February 2018
 DOI:
 10.1103/PhysRevC.97.024317
 arXiv:
 arXiv:1711.09587
 Bibcode:
 2018PhRvC..97b4317N
 Keywords:

 Nuclear Theory;
 Nuclear Experiment
 EPrint:
 10 pages, 7 figures, 9 tables