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Spallation-Fission Competition in Heaviest Elements: Triton Production

Spallation-Fission Competition in Heaviest Elements: Triton Production 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Spallation-Fission Competition in Heaviest Elements: Triton Production

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1957 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.107.1311
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Sep 1, 1957

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