Abstract
IN the course of experiments on the excitation of -rays by slow neutrons already reported, we have noticed that in some cases an appreciable amount of observed -rays was due to fast neutrons. Recently, we have investigated the emission of -rays by the bombardment of fast neutrons, and have obtained an interesting result as to the correlation of the cross-section for the exciting -rays with the atomic number. The experimental arrangements were essentially the same as those already described. The substance to be examined was surrounded by B2O3, and we believe that most of the neutrons reaching the substance retained their initial energy, which was about 2 × 106 e.v., in our case of D–D neutrons. The result is tabulated in an accompanying table. The figures given in the second column are the relative cross-section per atom in an arbitrary scale. The -ray activity did not remain after the bombardment was ceased.
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KIKUCHI, S., AOKI, H. & HUSIMI, K. Excitation of -Rays by Fast Neutrons. Nature 137, 398 (1936). https://doi.org/10.1038/137398a0
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DOI: https://doi.org/10.1038/137398a0
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