Propagation of Cosmic Rays in the Atmosphere and Models of Multiple Meson Production
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概要
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In this article the propagation of the primary and secondary cosmic-rays in the atmosphere is calculated theoretically, and the propriety of models of multiple meson production is examined through the comparison of the calculated results with experimental data. The mechanism of multiple meson production is formulated according to three main models of the phenomena (two-fire-ball model, H-quantum model and excited baryon model) which are under discussion at present, without losing their characteristic properties. The diffusion equations for various cosmic-ray components are solved and general solutions are given. The calculated results are compared with the experimental data of electromagnetic and nuclear-active components at Mt. Norikura by Japanese emulsion chamber group and at Mt. Chacaltaya by Japan-Brazil Emulsion Chamber Collaboration. μ-meson component is compared with the experimental data at Kolar Gold Field by Japan-India Collaboration. Special attention is paid to the energy dependence of the relative flux ratio between nuclear-active and electromagnetic components, I_<pb>(E) / I_γ(E), because the error and ambiguity inherent to the absolute measurement of cosmic-ray components can be eliminated. It is concluded through these comparisons that H-quantum model gives the best agreement with experimental data among them, and that two-fire-ball model is rejected due to its energy dependenec of I_<pb>(E) / I_γ(E).
- 理論物理学刊行会の論文
- 1971-09-14
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関連論文
- CHACALTAYA Emulsion Chamber Experiment
- Propagation of Cosmic Rays in the Atmosphere and Models of Multiple Meson Production