Gamma -Ray Spectrum Measurement from Capture Reactions of Uranium-238 for Thermal and Resonance Energy Neutrons

gamma-ray spectrum from the capture reaction of U-238 is measured for the thermal and resonance energy neutrons at KURNS-LINAC facility. Prominent primary gamma ray of 3.297 MeV listed in CapGam is not observed for the thermal energy neutrons. The measured gamma-ray spectrum is varied with neutron energy so that we can expect neutron spectrum inducing 238U(n,gamma) reactions in critical / subcritical cores could be deduced by the gamma-ray spectroscopy for the cores. Preliminary deduced ratio of 4.060 MeV gamma-ray emission to capture for the thermal energy neutron agrees with CapGam so that the deduction scheme is considered adequate.