On the Fine Structure of Zenithal Curves of the Cosmic Radiation

Abstract

Differential measurements of the absorption in lead of the mesonic component of cosmic radiation at 2200 m above sea level and also measurements of the variation of the mesonic component with zenith angle do not confirm the existence of a fine structure in the intensity spectrum. With zenith angle the variation is perfectly regular and roughly follows the ${cos}^{2}\ensuremath{\theta}$ law.