Depth Variation of Tritium and Argon-37 Produced by High-Energy Protons in Iron

Details Depth Variation of Tritium and Argon-37 Produced by High-Energy Protons in Iron Depth Variation of Tritium and Argon-37 Produced by High-Energy Protons in Iron

Sep 1957

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1957phrv..107.1695f&link_type=abstract

Physical Review, vol. 107, Issue 6, pp. 1695-1698

Physics

11

Scientific paper

The H3 produced by 0.16-, 1.0-, 3.0-, and 6.2-Bev protons and the A37 by 0.16-, 1.0-, and 6.2-Bev protons in long iron targets is measured as a function of depth. The maximum effective H3 cross section is 7.2 mb at 0.16 Bev, 60 mb at 1.0 Bev, 100 mb at 3.0 Bev, and 130 mb at 6.2 Bev. The maximum effective A37 cross section is 0.19 mb at 0.16 Bev, 4.7 mb at 1.0 Bev, and 6.7 mb at 6.2 Bev. The depth variation of these isotopes is very energy-dependent. At the higher energies a slight transition effect occurs. At the lower energies there is an exponential decrease with depth. The comparison of these measurements with the depth variation of He3 in the Carbo meteorite shows that the cosmic rays that produced the He3 in this material were very similar to the protons with 6-Bev energy. The H3 to A37 ratio is not very energy- or depth-dependent. The ratio is 15 at 1 Bev and 20 at 6.2 Bev. However, for 0.16-Bev protons the H3 to A37 ratio increases from 40 to 1000 in 4-cm depth. The H3 to A37 ratio is compared with the He3 to A36 ratio in four iron meteorites. These are comparable to a remarkable extent with the Bev proton results. The small variation of the He3 to A36 ratio in meteorites is related to the fact that the H3 to A37 ratio is not very energy- or depth-sensitive for protons in the Bev range; however, the He3 to A36 ratio also favors the 6-Bev energy.

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