Measurement of leakage neutron spectra from graphite cylinders irradiated with D-T neutrons for validation of evaluated nuclear data.
A benchmark experiment for validation of graphite data evaluated from nuclear data libraries was conducted for 14MeV neutrons irradiated on graphite cylinder samples. The experiments were performed using the benchmark experimental facility at the China Institute of Atomic Energy (CIAE). The leakage neutron spectra from the surface of graphite (Φ13cm×20cm) at 60° and 120° and graphite (Φ13cm×2cm) at 60° were measured by the time-of-flight (TOF) method. The obtained results were compared with the measurements made by the Monte Carlo neutron transport code MCNP-4C with the ENDF/B-VII.1, CENDL-3.1 and JENDL-4.0 libraries. The results obtained from a 20cm-thick sample revealed that the calculation results with CENDL-3.1 and JENDL-4.0 libraries showed good agreements with the experiments conducted in the whole energy region. However, a large discrepancy of approximately 40% was observed below the 3MeV energy region with the ENDF/B-VII.1 library. For the 2cm-thick sample, the calculated results obtained from the abovementioned three libraries could not reproduce the experimental data in the energy range of 5-7MeV. The graphite data in CENDL-3.1 were verified for the first time and were proved to be reliable.
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230027 China; Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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F
Luo
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China; Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing, 102413 China.
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R
Han
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China. Electronic address: zqchen@impcas.ac.cn.
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Z
Chen
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing, 102413 China.
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Y
Nie
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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F
Shi
College of Physics Electronic Information, Inner Mongolia University for the Nationalities, Tongliao, 028000 China.
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S
Zhang
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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W
Lin
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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Ren
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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G
Tian
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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Q
Sun
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 China.
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B
Gou
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing, 102413 China.
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Ruan
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing, 102413 China.
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J
Ren
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230027 China.
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M
Ye
Graphite; Integral experiment; Leakage neutron spectra