Abstract
Cosmic-ray air showers of total energy in the range to ev have been studied at 3260-m elevation with a large multiplate cloud chamber in combination with five thin-walled ionization chambers. The spatial distribution of electrons near the shower axis is usually a smooth function of distance with a singularity less marked than . Evidence is presented, however, to show that some showers have a lumpy structure near the axis. The showers are very poor in high-energy electrons and photons near the axis, relative to the expectation for a single electron-photon cascade. The angular distributions of shower axes are found for various shower sizes and prove to be quite similar to those expected for single electron-photon cascades. The implications for various shower models are discussed and a fairly extensive nucleonic cascade is indicated.
- Received 10 August 1953
DOI:https://doi.org/10.1103/PhysRev.93.578
©1954 American Physical Society