1957 年 12 巻 5 号 p. 454-459
Meson showers by heavy primary particles which have energy of 500 BeV per nucleon were studied with nuclear emulsions. Dealing with the event, “the nuclear disintegration cascade by heavy primary particle”, it was possible to estimate the energy of the primary particle with much accuracy by two methods, one by usual median angle of shower particles and the other by the opening angle of the fragmentation products of heavy primary particle. The angular distribution of the shower particle was studied and compared with the theory of Fermi and that of Landau.
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