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Stacked foils of Au 197 , Th 232 , and U 238 were bombarded, in a series of experiments, with 48-Mev helium ions, 24-Mev deuterons, and 32-Mev protons. Tritium from each foil was collected and then measured by a gas-counting technique. The qualitative results indicate that high-energy tritons are emitted in relatively large abundance from all targets and with each of the bombarding particles. Cross sections for triton production from fissionable U 238 and Th 232 and from nonfissionable Au 197 are comparable. The integrated ( α , t ) cross sections thus determined for U 238 and Th 232 are nearly the same as the integrated cross sections for the "( α , p 2 n )" reactions as determined by measuring the yield of the product heavy isotopes in radiochemical experiments. All of the facts are consistent with a picture of emission of high-energy tritons (whether due to a stripping, pickup, or other mechanism) in which fissionable intermediate nuclei are formed mainly at levels of excitation below their fission thresholds.
Physical Review – American Physical Society (APS)
Published: Sep 1, 1957
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