Accession Number : AD0683704

Title :   ELECTRON-INDUCED CASCADE SHOWERS IN WATER AND ALUMINUM,

Corporate Author : STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB

Personal Author(s) : Whitney,Randy R. ; Zeman,H. D. ; Crannell,Carol Jo. ; Crannell,Hall

Report Date : NOV 1968

Pagination or Media Count : 27

Abstract : In the present experiment, the three-dimensional distribution of energy deposition was measured for 1-GeV electron-induced showers in water and aluminum. For the water target, two different detectors were employed: CsI(T1) and anthracene. The measured longitudinal distribution of energy in water was found to be essentially independent of the detector employed in the measurement, while the radial distribution of energy deposition shows a strong detector dependence. Data were measured for the aluminum target with a CaF2(Eu) detector. All of these data support the description that the primary energy-deposition mechanism at the initiation of the shower is ionization of the target material and that the principle energy-transport mechanism after shower maximum is the propagation of minimum attenuation gamma-rays. The radial distributions of energy deposition show that the apparent dependence on the atomic number of the target observed in an earlier experiment was in part a detector-dependent result. The radial distributions, nevertheless, show significant differences from the prediction based on the Monte Carlo calculations of Nagel. (Author)

Descriptors :   (*COSMIC RAYS, *RADIATION MEASURING INSTRUMENTS), (*ELECTRON IRRADIATION, SHIELDING), GAMMA RAYS, ELECTRON ACCELERATORS, WATER, ALUMINUM, ATTENUATION, ABSORPTION

Subject Categories : Atmospheric Physics
      Nuclear Instrumentation
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE