Abstract
ANOMALIES of the absorption curve of vertically incident cosmic rays in lead have been reported1–6. Clay and his associates1–3 showed the existence of a second and third maximum in the ionization curve at about 16 and 25 cm. of lead. Chandrashekhar Aiya4 at Bangalore reported a drop in his intensity curve at 21 cm. of lead. Swann and Morris5 at Bocayuva found a drop at a lead thickness of 22 cm., whereas there was no apparent drop at Swarthmore. Recently, Fenyves and Haiman7 at Budapest observed anomalies in their absorption curve in lead at 18.2 cm. and 26.6 cm.
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References
Clay, J., Physica, 3, 332 (1936).
Clay, J., Gemert and Wiersma, Physica, 3, 627 (1937).
Clay, J., Venema and Jonker, Physica, 7, 673 (1940).
Aiya, Chandrashekhar S. V., Nature, 153, 375 (1944).
Swann, W. F. G., and Morris, P. A., Phys. Rev., 72, 1262 (1947).
George, E. P., and Appapillai, V., Nature, 155, 726 (1945).
Fenyves, E., and Haiman, O., Nature, 165, 244 (1950).
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GILL, P. Lead Absorption of Cosmic Rays at Different Altitudes near Magnetic Latitude 22° N.. Nature 166, 318–319 (1950). https://doi.org/10.1038/166318a0
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DOI: https://doi.org/10.1038/166318a0
