Illustration of the Dependence of the Sign ofδof a Mixed Gamma-Ray Transition on Its Order in a Cascade

Abstract

An analysis of the angular correlation functions obtained for $\gamma$-ray cascades following the decay of ${\mathrm{Tb}}^{156}$ (5-day) illustrates that different signs of $\delta$ (defined as the ratio, in a mixed transition, of the reduced matrix element corresponding to multipole order $L+1\mathrm{}$ to that corresponding to multipole order $L$) have to be used in a case where a $\gamma$ ray with mixed multipolarities is the first component of a cascade and in a case where the same $\gamma$ ray is the second component of a cascade investigated if the formulas and tables of Biedenharn and Rose are used for the analysis of the angular correlations.