Depth Variation of Tritium and Argon-37 Produced by High-Energy Protons in Iron
- 15 September 1957
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 107 (6), 1695-1698
- https://doi.org/10.1103/PhysRev.107.1695
Abstract
The produced by 0.16-, 1.0-, 3.0-, and 6.2-Bev protons and the by 0.16-, 1.0-, and 6.2-Bev protons in long iron targets is measured as a function of depth. The maximum effective 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 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 in the Carbo meteorite shows that the cosmic rays that produced the in this material were very similar to the protons with 6-Bev energy. The to 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 to ratio increases from 40 to 1000 in 4-cm depth. The to ratio is compared with the to ratio in four iron meteorites. These are comparable to a remarkable extent with the Bev proton results. The small variation of the to ratio in meteorites is related to the fact that the to ratio is not very energy- or depth-sensitive for protons in the Bev range; however, the to ratio also favors the 6-Bev energy.
Keywords
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