On the multipole mixing ratio of the 365 keV $\gamma$-transition in $^{129}$Ba

TL;DR

This paper reevaluates the multipole mixing ratio of a specific gamma transition in 129Ba, revealing a larger E2 component than previously reported, consistent with polarization measurements.

Contribution

The study provides a revised measurement of the multipole mixing ratio for the 365 keV gamma transition in 129Ba, improving understanding of its nuclear structure.

Findings

Large E2 admixture in the gamma transition

Better agreement with polarization data

Revised multipole mixing ratio value

Abstract

The $E2/M1$ multipole mixing ratio ($\delta$), reported by J. Gizon et al. Phys. Rev. C 17, 596 (1978), for 365 keV $\gamma$-transition in $^{129}$Ba is reevaluated and found altered. Experimentally determined angular distribution coefficients indicate a large E2 admixture in the 365 keV $\gamma$-ray. Indeed, it is found in better agreement with the reported linear polarization value for this $\gamma$-ray.