IN the course of experiments underground with the penetrating-burst apparatus described in a previous publication1, we have obtained evidence for the production of groups of penetrating particles at a depth of 60 m. water-equivalent of London clay.
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George, E. P., and Trent, P. T., Nature, 161, 248 (1948).
Greisen, K. E., Phys. Rev., 75, 1071 (1949).
Braddick, H. J. J., and Hensby, G., Nature, 144, 1012 (1939).
Wilson, J. G., Proc. Roy. Soc., A, 174, 73 (1940).
Evans, J., and George, E. P., Nature, [164, 20 (1949)].
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GEORGE, E., TRENT, P. Multiplicity in the Hard Component of Cosmic Radiation Underground. Nature 164, 838–839 (1949). https://doi.org/10.1038/164838b0
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