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by neutrons diffracted into the detector by the scatterers; its greatest value is about 3 percent. The results are given in Table I. If these cross sections are expressed in terms of a collision radius R, were a- = 2rR', and plotted against A as done by Sherr,3 it is seen that the values from Li to U lie on a nearly smooth curve, and are all below Sherr's line ER (1.7 + 1.22A1) X 10-13 cm] for 25-Mev neutrons. The difference becomes less for the heavier nuclei, as if the values are tending to approach a line near his. One possible interpre- tation is to say that the lighter nuclei are partially trans- parent, and approach opacity with increasing A. Dr. Serber has shown4 that such an interpretation is well justi- fied. An empirical formula that fits the data from Li to U very well is: R=(0.5+1.37A')E[1-exp(-0.49A)]X 10-13 cm. This formula is not intended to have any theoretical significance, but may be useful for purposes of interpola- tion. From Li to 0, the cross sections are nearly propor- tional to A. A complete account of this work will be pub- lished later. This paper is based on
Physical Review – American Physical Society (APS)
Published: Dec 15, 1947
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