Nature 166, 318 - 319 (19 August 1950); doi:10.1038/166318a0

Lead Absorption of Cosmic Rays at Different Altitudes near Magnetic Latitude 22° N.

P. S. GILL

Muslim University, Aligarh. April 4.

ANOMALIES of the absorption curve of vertically incident cosmic rays in lead have been reported^1–6. Clay and his associates^1–3 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.

1. Clay, J. , Physica, 3, 332 (1936). | Article |
2. Clay, J. , Gemert and Wiersma , Physica, 3, 627 (1937).
3. Clay, J. , Venema and Jonker , Physica, 7, 673 (1940). | Article | ChemPort |
4. Aiya, Chandrashekhar S. V. , Nature, 153, 375 (1944).
5. Swann, W. F. G. , and Morris, P. A. , Phys. Rev., 72, 1262 (1947). | Article | ISI |
6. George, E. P. , and Appapillai, V. , Nature, 155, 726 (1945). | ISI |
7. Fenyves, E. , and Haiman, O. , Nature, 165, 244 (1950). | ISI | ChemPort |