Energy of Electrons or Photons from Their Cascade Showers in Copper

Abstract

The photographs obtained by the Ecole Polytechnique cloud-chamber group have been used for the study of cascade showers in copper plates produced by electrons of known momentum. The best constant for obtaining primary energy from the total number of track segments is given. The uncertainty in primary energy as determined by this method is found from the experimentally observed distributions. The results are applied to the interpretation of the heavy $S$-particle observed at the Massachusetts Institute of Technology.