Octupole Deformation in 143, 145, 146Ba

Gamma rays emitted by fission fragments of Cf-252 and measured using the Gammasphere array continue to give insight into neutron rich nuclei. Using our high statistics data, we have reexamined high-spin states and linking transitions associated with octupole correlations in Ba-143,Ba-145,Ba-146. This has been a region of interest, when it was proposed that near Ba-145 there was a region of octupole deformation. In an even-A system, it is possible that rotational band structures are explainable by simplex quantum numbers, s = +1 and s = -1. The previous bands including octupole bands in Ba-143,Ba-145,Ba-146 have been extended. The new s = i octupole bands in Ba-145 and new s = -1 octupole bands in Ba-146 have been identified. In addition, collective model analysis of energy displacement, rotational frequency and B(E1)/B(E2) ratios have been carried out. Evidence of the rotational consequences of octupole deformation in even-even and even-odd isotopes is given. These nuclei have trends as rotation stabilizes the vibrational degrees of freedom. The experimental results are in agreement with theoretical calculations using the interacting boson and boson fermion models that are based on a universal nuclear energy density functional. (C) 2023 Elsevier B.V. All rights reserved.