Single Crystal as a High Energy Photons Detector for γ-Astronomy

One of the important problems of modern astrophysics and gamma–astronomy is in designing detectors for high energy photons (more than 1 GeV) with high angular resolution. In this energy range the dominating phenomenon in interaction of photons with matter is the e-e+ pair production. High angular resolution can be achieved using single crystals as effective converters of photons into e-e+ pairs due to coherent production of pairs in the channeling regime.