NUCLEAR-INTERACTIONS FOR 15 GEV-C PROTONS AND PIONS UNDER RANDOM AND CHANNELING CONDITIONS IN GERMANIUM SINGLE-CRYSTALS

Strong directional effects for nuclear-reaction probabilities have been observed when 15 GeV/c protons and pions are incident on a 4.2 mm Ge single crystal. In the random situation, our measurements are in agreement with Glauber's theory of diffraction scattering and with published particle-production data. When protons are incident in an aligned direction, the nuclear-reaction probabilities fall off very drastically but in a way which is in agreement with standard channeling theory; for aligned negative pions where a simple channeling theory is lacking, there is some experimental indication that nuclear-reaction probabilities are enhanced compared to the corresponding random rates, an indication which is supported by detailed computer-simulation studies. © 1978.