Method for measuring prompt γ-rays generated by D-T neutrons bombarding a depleted uranium spherical shell

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Jian-Guo Qin, Cai-Feng Lai, Li Jiang, Rong Liu, Xin-Wei Zhang, Bang-Jiao Ye and Tong-Hua Zhu. Method for measuring prompt γ-rays generated by D-T neutrons bombarding a depleted uranium spherical shell[J]. Chinese Physics C, 2016, 40(1): 014001. doi: 10.1088/1674-1137/40/1/014001
Jian-Guo Qin, Cai-Feng Lai, Li Jiang, Rong Liu, Xin-Wei Zhang, Bang-Jiao Ye and Tong-Hua Zhu. Method for measuring prompt γ-rays generated by D-T neutrons bombarding a depleted uranium spherical shell[J]. Chinese Physics C, 2016, 40(1): 014001.  doi: 10.1088/1674-1137/40/1/014001 shu
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Received: 2015-02-06
Revised: 2015-07-27
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    Supported by National Special Magnetic Confinement Fusion Energy Research, China (2015GB108001) and National Natural Science Foundation of China (91226104)

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Method for measuring prompt γ-rays generated by D-T neutrons bombarding a depleted uranium spherical shell

    Corresponding author: Rong Liu,
  • 1. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
  • 2. Institute of Nuclear Physics and Chemistry, CAEP, P.O. Box 213, Mianyang 621900, China
  • 3. Graduate School, China Academy of Engineering Physics, Mianyang 621900, China
  • 4.  Institute of Nuclear Physics and Chemistry, CAEP, P.O. Box 213, Mianyang 621900, China
  • 5.  Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China
  • 6.  Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Fund Project:  Supported by National Special Magnetic Confinement Fusion Energy Research, China (2015GB108001) and National Natural Science Foundation of China (91226104)

Abstract: The prompt γ-ray spectrum from depleted uranium (DU) spherical shells induced by 14 MeV D-T neutrons is measured. Monte Carlo (MC) simulation gives the largest prompt γ flux with the optimal thickness of the DU spherical shells 3-5 cm and the optimal frequency of neutron pulse 1 MHz. The method of time of flight and pulse shape coincidence with energy (DC-TOF) is proposed, and the subtraction of the background γ-rays discussed in detail. The electron recoil spectrum and time spectrum of the prompt γ-rays are obtained based on a 2"×2" BC501A liquid scintillator detector. The energy spectrum and time spectrum of prompt γ-rays are obtained based on an iterative unfolding method that can remove the influence of γ-rays response matrix and pulsed neutron shape. The measured time spectrum and the calculated results are roughly consistent with each other. Experimental prompt γ-ray spectrum in the 0.4-3 MeV energy region agrees well with MC simulation based on the ENDF/BVI.5 library, and the discrepancies for the integral quantities of γ-rays of energy 0.4-1 MeV and 1-3 MeV are 9.2% and 1.1%, respectively.

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