Parameters for the First Neutron Resonance in ¹¹³Cd

The total neutron cross section of ¹¹³Cd has been measured in the energy range from 0.025 to 1 eV with a crystal spectrometer using the Be(101) and NaCl(200) crystal planes as monochromators. A new method for second-order correction was applied, and the resonance at 0.181 eV was fitted to a Breit-Wigner single-level formula by the method of least squares. The resonance parameters obtained from the analysis are E₀ = 0.181 ± 0.003 eV, σ₀ = 7847 ± 187 b, Γ = 0.1087 ± 0.0033 eV, and Γ_n = (0.0791 ± 0.0032) × 10^-3 eV assuming that the statistical weighing factor is g = 3/4.