A study on multipole mixing ratio of γ-transitions from unfavoured to favoured signature partner of the πh11/2 band in 129Cs

Abstract

Angular distribution coefficients, a2 and a4, of the ∆I = 1 γ-transitions between the α = ±1/2 signature partners of πh11/2 band in 129Cs have been estimated for different multipole mixing ratio (δ) and compared with their experimental values available in the literature. From this study, a considerable amount of the E2 admixture is found in these transitions, especially at higher angular momentum. This provides further evidence for tri-axial nuclear shapes in 129Cs.