On the Electronic Component of Extensive Air Showers near the Axis

概要

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Using two multiplate cloud chambers and five density detectors consisting of 250G.M.-counter hodoscopes, characters of the electronic component of extensive air showers were investigated for various distances from the axis in the range r〓10m at 2770m altitude. The size N of the selected showers extended from 1×10^5 to 2×10^6. The following results were obtained: (1) The integral size spectrum can be represented by a power law of the form N^<-γ>, where the value of γ varies from 1.5 to 2.0 as the size increases. (2) The lateral density distribution of the high-energy electronic component with the energy E〓1 Bev fits well to that of the pure electronic shower with the age parameter s=1.4. (3) The ratio of the density of high-energy electrons and photons to that of all electrons is independent of the atmospheric depth. (4) The integral energy spectrum can be expressed by the E^<-n> within the energy region 250Mev 〓E〓1 Bev, and the value of n shifts from 0.7 to 1.2 with increasing r. (5) The lateral distribution of the energy flux carried by the electronic component is expressed by the form r^<-(1・57±0・24). (6) The showers having steeper lateral distribution of electrons than the average one near the axis contain more high-energy rays. (7) The averge zenith angle distribution is represented by the form cos^<6・7±1・4>θ, however that of showers containing more high-energy rays by the form cos^<10・0±2・0>θ.
1960-09-05