Letter | Published:

Absorption of Slow Neutrons


FERMI and others1 have shown that slow neutrons are very strongly absorbed by various elements; they found that the absorption curves are by no means exponential. The arrangement used in their experiments was to put the flat test-piece between sheets of the absorber inside a hole in the paraffin block that contained the source. Experiments that we have made under similar conditions have led to the same result, the absorption observed being the same whether the activation of the 20 sec. or the 2 min. period of silver is taken as measure of the intensity.

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  1. 1

    Proc. Roy. Soc., A., 149, 522; 1935.

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