COSMIC RAY HARD SHOWERS BELOW GROUND
The hard showers observed with a large multiplate cloud chamber at 50 and 250 mwe underground were analyzed These showers were classified according to the nature of their parents. The relative frequency of pi - and mu -induced showers, r, was r/sub 50/ = 0. 46 plus or minus 0.22 and r/sub 250/= 0.69 plus or minus 0.29. These results agree with theoretical calculation. The energy of each mu -induced shower is obtained assuming (1) a model of collisions at a c.m.s. of the virtual photons and the nucleons, (2) one fire-ball model, and (3) the model of constant transverse momentum of secondary particles. Energy distributions obtained are compared with those of the Williams-Weizsacker method. The value of photo-nuclear cross section is constant to several tens of Bev of shower energy. The angular distribution of the secondary pi -meson is isotropic in the model of (1) or (2). (auth)
- Research Organization:
- Osaka City Univ.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-013851
- OSTI ID:
- 4799408
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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