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Journal Reference
Annals of Nuclear Energy, Volume 81, 2015, Pages 281–286.
Feng1,2, Y.W. Yang1, X.X. Lu1, R. Liu1 , L. Jiang1, T.H. Zhu1, M. Wang1, J.G. Qin1
[expand title=”Show Affiliations”]- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
- Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Science, Hefei 230031, China
Abstract
In order to verify the evaluated cross sections of 232Th(n, 2n) reaction for the conceptual design of the thorium based subcritical blanket in the fusion–fission hybrid reactor, an integral experiment on thorium oxide/depleted uranium cylinders was carried out with D-T neutrons using the activation technique. 232Th(n, 2n) reaction rate distribution was obtained at the central axis direction in the assemblies with an uncertainty of about 7%. Experiments were analyzed by using MCNP code with ENDF/B-VI.8, ENDF/B-VII.0, JENDL-4.0 and CENDL-3.1 libraries to validate the nuclear data libraries of 232Th(n, 2n) reaction, the calculated results with JENDL-4.0 agree with the measurements the best with discrepancies within the experimental uncertainty. The average values of C/E for the three benchmark assemblies are 1.058, 1.044 and 0.980. Calculations with different evaluated libraries in the benchmark assemblies show a large discrepancy. The experimental results can be used to re-evaluate the cross sections of the 232Th(n, 2n) reaction.
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