Abstract
THE slow neutrons leaving a block of paraffin wax, containing a source of fast neutrons, mostly possess thermal energies. The existence of such thermal neutrons has been established by the discovery1 that the temperature T of the paraffin has an influence on the activities induced in various elements. Since the neutrons penetrating a screen of cadmium do not show this effect2, cadmium may be used to discriminate between the slowest neutrons (C-neutrons3) and the faster ones.
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FRISCH, O., VON HALBAN, H. & KOCH, J. Temperature Equilibrium of C-Neutrons. Nature 139, 922–923 (1937). https://doi.org/10.1038/139922b0
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DOI: https://doi.org/10.1038/139922b0
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