Angular correlation of K-L x-ray cascades in gadolinium

Angular correlation parameters (${\mathit{A}}_{22}$) between the K${\mathrm{\alpha }}_1$ and ${\mathit{L}}_3$ x rays were measured for gadolinium in the electron-capture decay of the isotope ${}_{}{}^{157}{}_{}{}^{}\mathrm{Tb}$. The results are ${\mathit{A}}_{22}$(K${\mathrm{\alpha }}_{1\mathrm{-}}$Ll)=0.272±0.042, ${\mathit{A}}_{22}$(K${\mathrm{\alpha }}_{1\mathrm{-}}$Lα)=0.032±0.015, ${\mathit{A}}_{22}$(K${\mathrm{\alpha }}_{1\mathrm{-}}$L${\mathrm{\beta }}_{2,15}$)=0.061±0.018. These values are in very good agreement with the theoretical calculations of Scofield [Lawrence Livermore Laboratory Report No. UCRL 51231, 1972 (unpublished)]; however, they differ from the earlier experimental data for the K${\mathrm{\alpha }}_{1\mathrm{-}}$Ll cascade in the 60<Z<70 atomic-number region.