Band structure change inZ>50region: Doubly odd120,122Cs and126,128La

Abstract
ΔJ=1 band structures were found in the doubly odd 120,122Cs and 126,128La nuclei via γ-ray spectroscopy following heavy-ion-induced reactions. The band characteristics for the Z>50 transition region (non-staggered spacings and positive E2/M1 mixing ratios), that are associated with the g9/2 proton-hole intruder, were observed in Cs120, but changed to significant staggering and negative mixing ratios along with increased E2 crossover branching in the other three nuclei.