Physics
Scientific paper
Sep 1954
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954jpsj....9..655h&link_type=abstract
Journal of the Physical Society of Japan, Volume 9, Issue 5, pp. 655 (1954).
Physics
1
Scientific paper
The local absorption in lead absorbers in a counter telescope has been measured at the depths of 20, 25.5 and 40 m.w.e., and compared them with the absorption produced by increasing the depth underground. It was found that the former agrees with the latter within the limit of the accuracy of the measurment. The results show that at least 98 percent of the cosmic rays underground consist of mu-mesons coming from the atmosphere, and that the remainder has short ranges and may be composed of electrons produced by mu-mesons in the ground. The cosmic rays underground created by unknown processes are probably very few.
Higashi Seigo
Oda Masuho
Oshio Takanori
Shibata Hajime
Watanabe Katsuhiro
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