Angular correlation of x rays:L−Mcascades of plutonium

Angular correlations between $L$ and $M$ x rays in ${}_{}{}^{239}{}_{}{}^{}\mathrm{Pu}$ obtained from a radioactive source of 32-yr ${}_{}{}^{243}{}_{}{}^{}\mathrm{Cm}$ were measured using Si(Li) and Ge(Li) detectors. The measured angular-correlation coefficients $A_{22}=(8.5\mathrm{}\pm 1.5)\times {10}^{-2\mathrm{}}$ for the $L{\beta }_1-M$ cascade and $A_{22}=(7.7\mathrm{}\pm 2.0)\times {10}^{-2\mathrm{}}$ for the $L{\alpha }_{1+2}-M$ cascade are both significantly higher than theoretical predictions. The intensity of the Pu $L_1-L_3$ x ray per $L_1$ vacancy was found to be $\frac{I(L_1-L_3)}{\Gamma \mathrm{}\left(L1\mathrm{}\right)\mathrm{}}=(6.6\mathrm{}\pm 0.8)\times {10}^{-2\mathrm{}}$. The angular correlation coefficient of the $L\alpha -(L_1-L_3)$ x-ray cascade was measured and found to be $A_{22}=(3\mathrm{}\pm 7)\times {10}^{-2\mathrm{}}$ and is in agreement with theoretical predictions.