Abstract
Rotating activation foils with resonance energies of 1.26 eV and 5.19 eV have been applied for exact measurements of neutron cross sections. The detector consisted of a sandwich of two rotating foils and was suitable for determining exactly the neutron flux at the resonance energy and energy changes in the neutron beam. The cross sections of polycrystalline samples showed uncertainties greater than the statistical error. The more accurate measurements on liquid samples yielded the following scattering cross sections of free atoms for neutrons of zero energy: Lead: σ0(Pb) = (11.261 ±0.006) b, Bismuth: σ0(Bi) = (9.300±0.003) b, and Sulfur: σ0(S) = (0.985 ±0.004) b. These data are of interest for an investigation of the neutron-electron interaction.
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