Investigation of electromagnetic showers produced by electrons in tungsten monocrystals

The paper is aimed at experimental studying the structural effect on the emission of positrons resulted from shower growth in tungsten. The spectra and orientation dependences of positrons in a shower produced by 700 MeV electrons in a 1740 μm thick tungsten single crystal are measured. The results of an investigation of scattering of a 1000 MeV electron beam by the sinqle crystal are presented. It is found that the structural periodicity of the target appreciably affects the spectral distribution of the positrons in the shower