Cascade Showers in Lead

Abstract

Cascade showers of energies up to 500-1000 Mev have been photographed in a cloud chamber that contained eight lead plates. A comparison with theory is made in terms of the size of a shower at its maximum as a function of the total number of particles in the shower. The conclusion reached is that the theoretical cross sections for radiation and pair production are essentially correct for energies up to 500-1000 Mev.