Abstract
IT has been suggested by Bohr1 that the rare isotope 23592U is responsible for the fission produced in uranium by slow neutrons, while the fission produced by fast neutrons is to be ascribed to the abundant isotope 23892U. In this connexion it is of interest to see whether any differences can be detected between the shapes of the resulting decay curves for the fission products of uranium bombarded with fast and slow neutrons, and also to compare these curves with those obtained with thorium. Some experiments by F. Joliot2 indicated that slow neutrons were relatively more effective in producing the longer period activities than the shorter.
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References
Bohr, N., Phys. Rev., 55, 418 (1939).
Joliot, F., J. Phys., 10, 159 (1939).
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BJERGE, T., BROSTRØM, K. & KOCH, J. Decay Curves of Uranium and Thorium Fission Products. Nature 143, 794 (1939). https://doi.org/10.1038/143794a0
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DOI: https://doi.org/10.1038/143794a0
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