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Article Navigation >  Nuclear Physics Review  > 2016  >  33(3): 308-314

ZHU Liang, LIU Longxiang, WANG Hongwei, MA Yugang, LI Chen, ZHANG Guoqiang, ZHANG Song, ZHONG Chen, CAO Xiguang, ZHANG Guilin, CHEN Jingen, CAI Xiangzhou, HAN Jianlong, HU Jifeng, WANG Xiaohe. A Study of the Filter Functions Used in the Photo-neutron Source[J]. Nuclear Physics Review, 2016, 33(3): 308-314. doi: 10.11804/NuclPhysRev.33.03.308
Citation: ZHU Liang, LIU Longxiang, WANG Hongwei, MA Yugang, LI Chen, ZHANG Guoqiang, ZHANG Song, ZHONG Chen, CAO Xiguang, ZHANG Guilin, CHEN Jingen, CAI Xiangzhou, HAN Jianlong, HU Jifeng, WANG Xiaohe. A Study of the Filter Functions Used in the Photo-neutron Source[J]. Nuclear Physics Review, 2016, 33(3): 308-314. doi: 10.11804/NuclPhysRev.33.03.308
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A Study of the Filter Functions Used in the Photo-neutron Source

doi: 10.11804/NuclPhysRev.33.03.308
  • 1.

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China;

  • 3.

    Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China

Funds:  Strategic Priority Research Program of Chinese Academy of Sciences (XDA02010100); National Nature Science Foundation of China (11475245); National Nature Science Foundation of China for Young Scientists (11305239)
  • Received Date: 2015-10-30
  • Rev Recd Date: 2015-12-28
  • Publish Date: 2016-09-20
  • A photo-neutron source driven by a 15 MeV electron LINAC is built for the "Strategic Priority Research Program" of the Chinese Academy of Sciences-the "thorium-based molten salt reactor" project to conduct the nuclear data measurement work,develop neutron detector and carry out reactor material irradiation studies.Since the neutron energy spectrum is continuous,the neutron energy is measured by the time of flight (TOF) method,and neutron filters are needed to confirm absorption peaks,calibrate the TOF,calculate the equivalent flight distance,and remove the experimental background which has great influence on the calculation accuracy of the total cross section.Based on the Monte Carlo simulation tool,Geant4 a simulation environment is set up,including neutron source and neutron filters,to study the energy absorption spectra and thickness of different filters and recommended data for the thickness are provided.The neutron TOF spectra are simulated and compared with experimental measurement,deciding the equivalent TOF distance to be 5.7 m.Geant4 can also simulate the background curve of multiple filters and be used to remove background and analyze errors for the experimental data.All the experiments,simulation and theoretical calculation show consistent results on filter thickness and neutron TOF parameters,indicating the accuracy of the measurement.
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    [2] CAI J,XIA X B,CHEN K,et al.Nuclear Science and Techniques,2014,25(3):030602.
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    [7] ABBONDANNO1 U,AERTS G,ALVAREZ H,et al.Cern n-TOF Facility:Performance Report[R].Geneva:European Organization for Nuclear Research,2003:43.
    [8] NOGUERE G.Mesure de la section efficace de capture neutronique et determination des parametres de resonances de I-127 et I-129[D].Strasbourg:UniversitéLouis PasteurStrasbourg I,2003:81.
    [9] KHANDAKER M U.Activities on the nuclear data measurement at the Pohang neutron facility based on electron LINAC[C].Proceedings of Asian Particle Accelerator Conference.2007:800.
    [10] KOPECKY S,BRUSEGAN A.Nuclear Physics A,2006,773(3):173.
    [11] AGOSTINELLI S,ALLISON J,AMAKO K,et al.Nucl Instr Meth A,2003,506(3):250.
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    [13] National Research Council Canada.EGSnrc:Software Tool to Model Radiation Transport[EB/OL].[2015-09-06].http://www.nrc-cnrc.gc.ca/eng/solutions/advisory/egsnrcindex.html.
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A Study of the Filter Functions Used in the Photo-neutron Source

doi: 10.11804/NuclPhysRev.33.03.308
  • 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
  • 2. University of Chinese Academy of Sciences, Beijing 100049, China;
  • 3. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China
Funds:  Strategic Priority Research Program of Chinese Academy of Sciences (XDA02010100); National Nature Science Foundation of China (11475245); National Nature Science Foundation of China for Young Scientists (11305239)
  • Received Date: 2015-10-30
  • Rev Recd Date: 2015-12-28
  • Publish Date: 2016-09-20

Abstract: A photo-neutron source driven by a 15 MeV electron LINAC is built for the "Strategic Priority Research Program" of the Chinese Academy of Sciences-the "thorium-based molten salt reactor" project to conduct the nuclear data measurement work,develop neutron detector and carry out reactor material irradiation studies.Since the neutron energy spectrum is continuous,the neutron energy is measured by the time of flight (TOF) method,and neutron filters are needed to confirm absorption peaks,calibrate the TOF,calculate the equivalent flight distance,and remove the experimental background which has great influence on the calculation accuracy of the total cross section.Based on the Monte Carlo simulation tool,Geant4 a simulation environment is set up,including neutron source and neutron filters,to study the energy absorption spectra and thickness of different filters and recommended data for the thickness are provided.The neutron TOF spectra are simulated and compared with experimental measurement,deciding the equivalent TOF distance to be 5.7 m.Geant4 can also simulate the background curve of multiple filters and be used to remove background and analyze errors for the experimental data.All the experiments,simulation and theoretical calculation show consistent results on filter thickness and neutron TOF parameters,indicating the accuracy of the measurement.

ZHU Liang, LIU Longxiang, WANG Hongwei, MA Yugang, LI Chen, ZHANG Guoqiang, ZHANG Song, ZHONG Chen, CAO Xiguang, ZHANG Guilin, CHEN Jingen, CAI Xiangzhou, HAN Jianlong, HU Jifeng, WANG Xiaohe. A Study of the Filter Functions Used in the Photo-neutron Source[J]. Nuclear Physics Review, 2016, 33(3): 308-314. doi: 10.11804/NuclPhysRev.33.03.308
Citation: ZHU Liang, LIU Longxiang, WANG Hongwei, MA Yugang, LI Chen, ZHANG Guoqiang, ZHANG Song, ZHONG Chen, CAO Xiguang, ZHANG Guilin, CHEN Jingen, CAI Xiangzhou, HAN Jianlong, HU Jifeng, WANG Xiaohe. A Study of the Filter Functions Used in the Photo-neutron Source[J]. Nuclear Physics Review, 2016, 33(3): 308-314. doi: 10.11804/NuclPhysRev.33.03.308
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