Cascade multiplication of a 26-GeV electron shower in a lead plate-emulsion sandwich chamber

The electron-photon shower development in a lead plate-emulsion sandwich chamber with a total effective lead thickness of 3.5 radiation units was studied for an electron energy of 26 GeV. The experimental electron multiplication coefficient (Pexp=19.4±1.4) agrees with a theoretical value (Pcalcd=20.4) calculated with corrections for the particle scattering and absorption.