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Abstract A study has been made of the X-rays symmetrically diffracted by the (130) and (10) planes of NaCl. The object of the study was to determine whether or not X-rays are diffracted in both directions simultaneously. Two Geiger Muller counters were used to detect the X-rays. A coincidence circuit was connected to the two counters. Over 20 million quanta were counted by each counter, yet only 12 thousand apparent coincidences were observed. A detailed study of the data reveals that this small number of coincidences is best interpreted by assuming no coherence between the two diffracted X-ray beams and attributing the coincidence counts to the chance arrival of two quanta, one at each counter, separated in time by less than the resolving time of the coincidence circuit. This lack of coincidence is in accord with the quantum picture of radiation.
M. Parker Givens (Wed,) studied this question.