Determination of the ²³²Th(n, ) cross section from 10 to 200 keV at the Back-n facility at CSNS

The neutron capture cross section of Th-232 has been measured with the time-of-flight technique in the energy range from 10 to 200 keV at the back-streaming white neutron beam-line (Back-n) of China Spallation Neutron Source (CSNS). The pulse height weighting technique (PHWT) was applied with four C6D6 liquid scintillators to measure the prompt gamma-ray energy release following neutron capture. The measurement data, corrected with the PHWT, have been normalized to the saturated resonances at 21.8 eV. The background was determined by a lead sample measure-ment and detailed Monte Carlo simulations. The T-232 h(n, gamma ) average cross sections have been determined relative to the Au-197(n, gamma ) reaction cross sections. The results are consistent with the evaluation values of CENDL-3.2 and JENDL-5. The total uncertainties, including the PHWT, normalization, background subtraction, corrections, and relative measurement, are in the range of 4.5-4.8%.