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We implemented a didactic experiment to study the angular correlation betweenthe two gamma rays emitted in typical $^{60}$Co radioactive decays. We used twoNaI(Tl) scintillators, already available in our laboratory, and a low-activity$^{60}$Co source. The detectors were mounted on two rails, with the source attheir center. The first rail was fixed, while the second could be rotatedaround the source. We performed several measurements by changing the anglebetween the two scintillators in the range from $90^\circ$ to $180^\circ$.Dedicated background runs were also performed, removing the source from theexperimental setup. We found that the signal rate increases with the angularseparation between the two scintillators, with small discrepancies from thetheoretical expectations.

european journal of physics

Measurement of the angular correlation between the two gamma rays  emitted in the radioactive decays of a $^{60}$Co source with two NaI(Tl)  scintillator