Angular distributions of ultrarelativistic electrons at axis-motion in diamond and tungsten crystals

Orientation dependences of soft gamma-radiation and radiation electron losses are measured for diamond (thickness t10 mm, axis <100>) and tungsten (t=0.29 mm, axis <111>) crystals at the angle of 5 mrad to the primary electron beam). It is shown that some electrons are scattered on the potential of the atom chain and the others due to thermal oscillations. Narrower angular distributions as compared with disorientated ones are observed with increase of Debye temperature for the crystals orientated by the axis along the direction of primary particle motion