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The measurement of the angular distribution of maximally correlatedannihilation gamma rays radiated in coincidence, like those emitted from a$^{22}\mathrm{Na}$ source, is a classic experiment that is nowadays ordinarilyperformed in Nuclear Physics laboratory classes. For the first time we presentan analytic expression for such angular distribution, which can be easilytested and confronted with the laboratory measurements.

Maximal angular correlation in $\gamma-\gamma$ coincidences: a quantitative study