Chinese Physics C > 2016, Vol. 40 > Issue(1): 014001 DOI: 10.1088/1674-1137/40/1/014001

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

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

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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.
- D-T neutron,
- depleted uranium,
- prompt -ray,
- delayed -ray,
- time of flight

References

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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

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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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通讯作者:陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date:2015-02-06

Accepted Date:2015-07-27

Available Online:2016-01-20

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

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