Abstract
IT has been shown by Fermi and his collaborators1 that the efficiency of radioactivation of certain elements by neutron bombardment is greatly increased by surrounding them with water, paraffin or similar hydrogen-containing substances. This effect is attributed to multiple collisions between neutrons and protons, similar to those due to the thermal agitation of gas molecules, producing reduction in speed of the neutrons, which facilitates capture by other nuclei.
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References
La Ricerca Scientifica, V, 2, 7–8; 1934. V, 2, 380; 1934. VI, 1, 2; 1935.
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HOPWOOD, F., CHALMERS, T. Directed Diffusion or Canalisation of Slow Neutrons. Nature 135, 341–342 (1935). https://doi.org/10.1038/135341b0
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DOI: https://doi.org/10.1038/135341b0
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