Investigation of Cascade Showers in Lead with X-Ray Films

抄録

By using x-ray films with different sensitivities, observations have been made on the lateral and longitudinal distributions of the energy loss in showers developing in lead. The x-ray films inserted among lead plates were irradiated by the electron beam with an energy of 200 MeV and by the bremsstrahlung gamma-ray beam with peak energies of 720 MeV and 200 MeV.
There seems to be some difference between Kantz and Hofstadter’s results and ours in the lateral and longitudinal distributions of the energy loss in the electron-initiated shower. This difference is discussed in some detail. The results are also compared with the conventional shower theory.
A fraction energy loss contained in various cylindrical volumes of lead is calculated from data obtained in the present experiment to facilitate a determination of the efficiency of a total absorption type detector.