Multi-Cored Air Showers Observed by a Combination Array of Spark Chambers and Scintillation Counters

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The multi-core phenomena of extensive air showers were studied for sizesaround 10' by a double-layer core detector array of spark chambers and sdintilla-tion counters at Mt. Norikura. Forty five events out of 123 air showers whosecores hit the core detector array were finely analyzed using spark photographs ofthem. We found that in the scintillation counter data the subpeaks were sometimesmissed and, on the contrary, appeared the "spurious" subpeaks which were notobserved in the spark chambers. By using the spark phc;tographs, the subcores ofan atmospheric origin with a wide spread lateral distribution of shower particlescan be separated from those of a wall or a roof origin' with a very steep lateraldistribution. Applying the criterions of subcores, used by the four groups in Tokyo,Osaka, Sydney and Kiel, to our spark chamber data, we obtain the similar resultsto their frequencies of multi-cored air showers.
社団法人日本物理学会の論文
1977-05-15