Abstract
J. ROTBLAT compares the increase in the neutron effect obtained by means of uranium with that produced by aluminium and copper, and concludes that v. Halban, Joliot and Kowarski are correct in ascribing the uranium effect to the increase in the number of neutrons resulting from the fission of uranium nuclei, rather than to the simple reaction (n,2n).
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Points from Foregoing Letters. Nature 143, 860 (1939). https://doi.org/10.1038/143860b0
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DOI: https://doi.org/10.1038/143860b0