Physics
Scientific paper
Aug 1952
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1952rspsa.214..225b&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 214, Issue 1117, pp. 225-237
Physics
3
Scientific paper
Some properties of cosmic rays at 3570 m have been studied by observing nuclear disintegrations in G5 emulsion under lead absorbers. Good geometrical definition was ensured by making these absorbers in the form of inverted lead cones of various half-angles. The nuclear cascade process is such that the overall attenuation in lead of the star-producing component increases with energy, the attenuation length varying from 370 ± 30 to 210 ± 70 g cm-2 over the range of energy responsible for the stars examined. Interpretation of the results to give the angular distribution of the star-producing radiation depends upon the nature of the cascade process. However, it is certainly more collimated than a cos2 Theta steradian-1 distribution, where Theta is the zenith angle, and may be of the form cos4 Theta steradian-1 for the high-energy component. For the charged component alone a direct measurement gave cos5± 1 Theta steradian-1. The rate of production in emulsion under no absorber of all stars with three or more heavy prongs is 17\cdot 0 ± 0\cdot 4 cm-3 day-1.
Barford N. C.
Davis Gary
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