Coherence effect in the photoproduction of symmetric e+e- pairs in germanium and silicon crystals
Andreyashkin M. Yu., Basai A. Yu., Vorob'ev S. A., Zabaev V. N., Kalinin B. N., Kunashenko Yu. P., Pivovarov Yu. L.
A coherence effect of type В has been demonstrated experimentally in the photoproduction of symmetric e+e~ pairs in a (111) germanium crystal and a (100) silicon crystal.