Systematic studies have been done on the differential and integral equilibrium spectra for electrons and photons in showers caused by primary electrons or photons. The spectra as functions of particle energy have been obtained by numerical solution of integral equations from the cascade theory with allowance for polarization, incomplete screening, the Compton effect, and the photoelectric effect. The accuracy has been examined for approximations such as neglecting the electrons rest mass and describing the ionization losses by means of an energy-differential term.
Research Institute of Nuclear Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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