Resonance parameters extracted from the SAMMY fit of the natCu resonance region yield.

This work is based on the Back-n of the China Spallation Neutron Source, using the TOF method and the C6D6 detector system. It conducts a measurement study on the neutron capture cross section of natural copper within the range of 1 ev to 1 Mev. We obtained relatively accurate results in the resonance region. The capture yield in the distinguishable resonance region was analyzed using R-matrix SAMMY fitting, and the resonance parameters were extracted.