Test for Octupole Collectivity in Light Barium Isotopes

Abstract

This work explores the structure of yrast alternating-parity spectra of the light even-even Barium isotopes 118−124Ba within a collective quadrupole-octupole rotation model (QORM). The model analysis of the band-structure and parity-shift effects in these nuclei indicates the persisting manifestation of octupole collectivity away from the double “octupole magicity” (Z = 56, N = 88) and suggests that it may still govern the shape dynamics in the low Barium masses. On the other hand it is realized that different effects stemming from the intrinsic shell structure and the dominance of quadrupole deformation may have a competing role emphasizing on the need for further more detailed study of this mass region.