The spin of the 1643 keV state and multipole mixing ratios of γ-transitions in 134Ba

Abstract

Directional correlations of the 134Ba γ-rays following the β-decay of 134Cs have been measured using two high-resolution 30 cm 3 coaxial Ge(Li) detectors. Particular attention was paid to the various corrections that must be applied in measuring γ-γ directional correlations in complex decays. It was clearly established that the spin-parity of the 1634 keV excited state of 134Ba is 3 +. The multipole mixing ratios (in the Krane-Steffen definition) of the 134Ba γ-rays are (energies in keV): | δ(475)| = > 18, δ(563) = −7.4 ± 0.9, δ(569) = +0.29 ± 0.02, δ(1038) = 1.85 ± 0.15.