Study of neutron spectra in a water bath from a Pb target irradiated by 250 MeV protons

Spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with a cadmium （Cd） cover....

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Published inChinese physics C Vol. 39; no. 4; pp. 31 - 36
Main Author 李严严 张雪荧 鞠永琴 马飞 张宏斌 陈亮 葛红林 万波 骆鹏 周斌 张艳斌 李建阳 徐俊奎 王松林 杨永伟 杨磊
Format Journal Article
LanguageEnglish
Published 01.04.2015
Subjects
Cadmium
Computer simulation
Detectors
Foils
Lead (metal)
Mathematical analysis
Neutron spectra
Water baths
中子通量
光谱
实验数据
水浴
电子
谐振能量
质子辐照
铅靶
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/39/4/044001

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Summary:Spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with a cadmium （Cd） cover. According to the measured activities of the foils, the neutron flux at different resonance energies were deduced and the epithermal neutron spectra were proposed. Corresponding results calculated with the Monte Carlo code MCNPX were compared with the experimental data to check the validity of the code. The comparison showed that the simulation could give a good prediction for the neutron spectra above 50 eV, while the finite thickness of the foils greatly effected the experimental data in low energy. It was also found that the resonance detectors themselves had great impact on the simulated energy spectra.
Bibliography:spallation reaction, bath activation method, neutron spectrum, MCNPX simulation
11-5641/O4
Spallation neutrons were produced by the irradiation of Pb with 250 MeV protons. The Pb target was surrounded by water which was used to slow down the emitted neutrons. The moderated neutrons in the water bath were measured by using the resonance detectors of Au, Mn and In with a cadmium （Cd） cover. According to the measured activities of the foils, the neutron flux at different resonance energies were deduced and the epithermal neutron spectra were proposed. Corresponding results calculated with the Monte Carlo code MCNPX were compared with the experimental data to check the validity of the code. The comparison showed that the simulation could give a good prediction for the neutron spectra above 50 eV, while the finite thickness of the foils greatly effected the experimental data in low energy. It was also found that the resonance detectors themselves had great impact on the simulated energy spectra.
LI Yan-Yan ZHANG Xue-Ying JU Yong-Qin MA Fei ZHANG Hong-Bin CHEN Liang GE Hong-Lin WAN Bo LUO Peng ZHOU Bin ZHANG Yan-Bin LI Jian-Yang XU Jun-Zui WANG Song-Lin YANG Yong-Wei YANG Lei （1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China）
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ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/39/4/044001