Abstract
Transmission measurements of thermal-neutron capture gamma rays in lead have been made with a tin absorber of varied thickness for direct determination of the resonance energy and for obtaining an effective nuclear cross section. It was found that resonance occurred at the energy of 6729.8 keV gamma rays from 204Pb(n,γ). The gamma-ray energy from 206Pb(n,γ) was then measured to be 6738.1 keV. The effective absorption cross section of the resonant level in 120Sn was measured to be (0.48±0.05) b. The usefulness of this method is briefly discussed.
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