The Angular Correlation of Successive Gamma-Rays

Abstract

The angular dependence of gamma-gamma coincidences has been studied for ${\mathrm{Na}}^{24}$, ${\mathrm{Cl}}^{38}$, and ${\mathrm{Br}}^{82}$ in an attempt to evaluate the predicted angular correlations between successive quanta. The coincidence rates were found to be independent of the relative directions of the quanta to within a few percent except as the counters approached each other closely, where an increase was observed. This increase was attributed to scattered quanta and was measured by an independent method.