Abstract
The neutron tctal cross sections of carbon, calcium, and lead were determined in the energy region 200 to 960 kev using a time-of-flight technique. The observed cross section for carbon was analyzed in terms of the effective- range theory as well as the bound-level contribution. It is concluded that the upper limit for the total width of the proposed resonance in C/sup 13/ at 610 kev is 100 ev. For calcium and lead the data are analyzed for resonance parameters. It was found that the s-wave strength function for Ca/sup 40/ increased rapidly with increasing energy. It was concluded also that the course of the lead cross sections can be explained only by the presence of a broad s- wave resonance in Pb/sup 208/. (auth)
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