Effects of pi meson decay-absorption phenomena on the high-energy mu meson zenithal variation near sea level

An approximate calculation of the ground-level high-energy mu meson intensities is presented, with curves showing peculiar maxima in the angular vicinity from about 55° to 75° with respect to the vertical at ground-level energies from about 60 bev to 160 bev. The effects are explained in terms of well known pi meson decay-absorption phenomena high in the earth's atmosphere.