Angular Correlations of Gamma Rays in Cascade from Levels inLu175andHf177

Abstract

The directional angular correlations of the 208.36-112.97 kev gamma-gamma cascade in ${\mathrm{Hf}}^{177}$ and the 89.36-343.40 and 282.57-113.81 kev cascades in ${\mathrm{Lu}}^{175}$ have been measured with a coincidence scintillation spectrometer using NaI detectors. The observed correlation functions obtained with dilute aqueous solution sources are $W\left(\theta \right)=1-(0.1614\mathrm{}\pm 0.0015)P_2\left(cos\theta \right)$, $W\left(\theta \right)=1+(0.001\mathrm{}\pm 0.004)P_2\left(cos\theta \right)$, and $W\left(\theta \right)=1+(0.221\mathrm{}\pm 0.004)P_2\left(cos\theta \right)$, respectively.