The angular dependence of gamma-gamma coincidences has been studied for Na²⁴, Cl³⁸, and Br⁸² 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.
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Robert Beringer (1943) studied this question.
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