THE CHARGE SPECTRUM AND INTERACTIONS OF RELATIVISTIC HEAVY NUCLEI IN THE PRIMARY COSMIC RADIATION
- 1 May 1966
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 44 (5), 1121-1145
- https://doi.org/10.1139/p66-094
Abstract
The charge spectrum of relativistic heavy nuclei in the primary cosmic radiation has been investigated in a stack of nuclear emulsions exposed over Texas at a ceiling height of 136 000 ft. Charges of 601 primary and of 203 fast secondary nuclei arising from fragmentations have been determined. Using a "range" criterion to count δ rays, charge resolutions up to Z = 15 have been obtained.All of the tracks have been followed through the stack and the interaction mean free paths in emulsion and the fragmentation probabilities evaluated for individual elements up to Z = 15. Using these probabilities, the relative abundances at the top of the atmosphere were 12.7 ± 1.3% L nuclei [Formula: see text], 63.5 ± 3.5% M nuclei [Formula: see text], 13.6 ± 1.6% H3 nuclei [Formula: see text], 1.7 ± 0.5% H2 nuclei [Formula: see text], and 8.5 ± 1.4% H1 nuclei [Formula: see text]. It was found that the interaction mean free paths in emulsion of the M and H nuclei were about 10% lower than previous experimental and calculated values. The fragmentation probabilities were generally in agreement with previous determinations, except for a significantly high value for the fragmentation of H1 to L nuclei.Keywords
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