A Cloud Chamber Study of the Cosmic-Ray Hard Showers

概要

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Cosmic ray hard showers produced in iron and in lead have been studied by using the multiplate cloud chamber at 2740m above sea level. Primary energies of the meson producing showers were estimated from the angular and the momentum distributions of the secondaries by various methods and the results were compared with each other. The observed hard showers were classified according to their median angles. About half of the showers which belong to the smaller median angle group may be interpreted as that they have been produced at the periphery of the Pb nuclei. They amount to about 20% of total hard showers. The mean free path for the production of hard showers was obtained as 25±50gr/cm^2 in lead, and the mean free path of the charge exchange scattering of pions was 1.0±0.3Kg/cm^2 in lead for energies greater than 1 Bev.
1956-01-05