Measurement and Analysis of Am-241(n,gamma) Cross Sections with C6D6 Detectors at the n_TOF Facility at CERN

The Am-241(n,gamma) cross sections have been measured at the n_TOF facility at CERN using C6D6 liquid scintillators and time of flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit can be extended from 150 eV to 320 eV. The analysis goes from thermal energy to 150 keV, and the unresolved resonance range cross section turns out to be larger than expected by evaluations or otherwise measured by previous works. The thermal cross section is found to be sigma th = 740 +/- 74 barns, which is larger than expected by evaluations and most previous measurements.