Abstract
USING two simultaneously operated cloud chambers, we have investigated the occurrence of large cosmic ray showers originating high in the atmosphere1, and the transition behaviour of these showers in absorbing material. The cloud chambers were 28 cm. in diameter with an illuminated depth of 4 cm. (chamber I) and 8 cm. (chamber II) respectively. The counters used to select showers and so to operate both chambers were all situated around chamber I, there being none around chamber II. The whole apparatus was situated beneath a light roof.
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References
Auger, Maze and Grivet-Meyer, C.R. Acad. Sci, 206, 1721,; 207, 288 (1938).
Nie, Z. Phys., 99, 453, (1936).
Euler and Heisenburg, Ergebn. exakt. Naturwiss. (1938).
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LOVELL, A., WILSON, J. Investigation of Cosmic Ray Showers of Atmospheric Origin, using Two Cloud Chambers. Nature 144, 863–864 (1939). https://doi.org/10.1038/144863a0
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DOI: https://doi.org/10.1038/144863a0
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