Abstract
The distribution of the angle of divergence of pairs produced by high-energy photons in a crystal differs in many features from the usual one-atom distribution. This difference is calculated by taking into account the number of reciprocal points corresponding to the various angles. The result is, that, if the photon beam incides on the crystal normally to a lattice plane, although the total cross-section is less than the one-atom cross-section, there are some angles where large constructive interferences occur. If, on the other hand, the photon beam makes a small but finite angleθ with the normal to a lattice plane, the crystal distribution oscillates around the one-atom distribution. Numerical calculations have been performed by means of an « IBM 650 » computer.
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