Abstract
The neutron capture cross section of \(^{232}Th\) 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 C\(_{6}\)D\(_{6}\) 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 measurement and detailed Monte Carlo simulations. The \(^{232}Th(n,\gamma )\) average cross sections have been determined relative to the \(^{197}Au(n,\gamma )\) 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%.
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The manuscript has data included as electronic supplementary material. The online version of this article contains supplementary material, which is available to authorized users.
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Acknowledgements
The authors are indebted to the operating crew of the CSNS Back-n white neutron source. Dr. Peter Schillebeeckx from EU-JRC-IRMM is appreciated for the helpful discussions. This work was supported by the National Natural Science Foundation of China (Grant no. 11790321) and the Youth Talent Program of China National Nuclear Corporation.
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Wang, J., Ren, J., Jiang, W. et al. Determination of the \(^{232}Th(n,\gamma )\) cross section from 10 to 200 keV at the Back-n facility at CSNS. Eur. Phys. J. A 59, 224 (2023). https://doi.org/10.1140/epja/s10050-023-01126-0
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DOI: https://doi.org/10.1140/epja/s10050-023-01126-0