Abstract

Tritium and rare gas production cross-sections for highenergy protons were measured in different materials, including complex materials such as olivine and stone meteorites, in order to estimate production rates and ratios of these isotopes in meteorites. To find the general behavior of the excitation functions, measurements were made between energies of 0.6 and 25 Bev. The influence on the cross-sections due to irradiation technique, monitoring cross- sections, and gas separation from the target was studied. Values are given for the cross-sections with absolute errors of 15%, and in some cases below 10%. Production ratios were determined from the cross-section measurements, and the final cross-section results were compared with expected values from Monte Carlo calculations and from Rudstam's spallation formulae. In general, agreement was satisfactory, although the parameters chosen for the stable isotopes in Rudstam's spallation formulae were slightly different from the values adopted for the radioactive isotopes. The results obtained also show in general good agreement with the predictions of the evaporation theory, 62 references. (auth)

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