Fast Neutron Spectrum in Water with a Deuterium-Tritium Neutron Source

The scalar neutron spectrum per source neutron was measured with a miniature NE-213 spectrometer at several positions in water irradiated with deuterium-tritium neutrons. The measured spectrum was compared with a calculated one using the MORSE-GG Monte Carlo code with a modified point-detector estimator presented by Carter and Cashwell and the GICXFNS group cross-section set processed from the ENDF/B-IV library. The measured and calculated spectra agreed within the errors estimated from the statistical error and unfolding oscillations.