Interpretation of Shankland's Experiment

THE experimental results of Shankland1 are in contradiction with the accepted theory of the Compton effect, in particular with the idea of detailed conservation of energy and momentum. If we accept his evidence, and if we assume that, in this process, energy and momentum are not given out in some unknown form, we have to conclude that energy and momentum are not conserved. As Dirac pointed out recently2, Shankland's result would be compatible with the point of view of Bohr, Kramers and Slater. I would like, however, to direct attention to the fact that this point of view by no means affords the only plausible interpretation of the experiment.