Note on the Production of Showers in Various Materials

Abstract

Data are presented on the increased counting rate due to shower production by layers of equal atomic density for copper, tin and lead. The observed increases of counting rate in the case of these elements are found to vary as a power of the atomic number which is slightly although significantly greater than the second. These results appear qualitatively consistent with our previously reported observations in which the mass per unit area of the producing materials was kept constant for the various elements and for which a dependence on the atomic number of the second power was reported.