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《中国物理C》 2016-01
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Method for measuring prompt γ-rays generated by D-T neutrons bombarding a depleted uranium spherical shell

Jian-Guo Qin;Cai-Feng Lai;Li Jiang;Rong Liu;Xin-Wei Zhang;Bang-Jiao Ye;Tong-Hua Zhu;Department of Modern Physics, University of Science and Technology of China;Institute of Nuclear Physics and Chemistry, CAEP;Graduate School, China Academy of Engineering Physics;Institute of Applied Physics and Computational Mathematics;  
The prompt γ-ray spectrum from depleted uranium(DU) spherical shells induced by 14 Me V 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 BC501 A 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 promptγ-ray spectrum in the 0.4–3 Me V 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 Me V and 1–3 Me V are 9.2% and 1.1%,respectively.
【Fund】: Supported by National Special Magnetic Confinement Fusion Energy Research China(2015GB108001);; National Natural Science Foundation of China(91226104)
【CateGory Index】: O571.5
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