Physics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jpsj...42.1439o&link_type=abstract
Physical Society of Japan, Journal, vol. 42, May 1977, p. 1439-1447.
Physics
1
Cosmic Ray Showers, Scintillation Counters, Spark Chambers, Density Distribution, Frequency Distribution, Photographic Recording, Radiation Measurement
Scientific paper
The multicore phenomena of extensive air showers were studied for sizes around 100,000 by a double-layer core detector array of spark chambers and scintillation counters at Mt. Norikura. Forty five events out of 123 air showers whose cores hit the core detector array were finely analyzed using spark photographs of them. We found that in the scintillation counter data the subpeaks were sometimes missed and, on the contrary, appeared the 'spurious' subpeaks which were not observed in the spark chambers. By using the spark photographs, the subcores of an atmospheric origin with a wide spread lateral distribution of shower particles can be separated from those of a wall or a roof origin with a very steep lateral distribution. 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 results to their frequencies of multicored air showers.
Dake S.
Hatano Yoshikazu
Jitsuno K.
Ohmori Nobuharu
Sakata Makoto
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