Neutron Resonance Spectroscopy in Natural Copper

High resolution measurements of the total neutron cross section from 200 eV to ∼50 keV in natural copper have been performed using time-of-flight techniques. From the R-matrix analysis of the data, values of E₀, Γ_n, J^π of resonances, strength functions, and average level spacings are obtained. For in units of eV^−1/2 were obtained. Similarly, the average level spacings are determined for ⁶³Cu⟨D⟩ _{J = 1} = (2.38 ± 0.38) keV, ⟨D⟩_{J = 2} = (3.57 ± 0.70) keV and for ⁶⁵Cu⟨D⟩_{J = 1} = (3.85 ± 0.88) keV and ⟨D⟩_{J = 2} = (5.0 ± 1.2) keV.