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

作　　者：秦建国 赖财锋 蒋励 刘荣 张信威 叶邦角 朱通华 

机构地区：[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 Applied Physics and Computational Mathematics,P.O.Box 8009,Beijing 100088,China

出　　处：《Chinese Physics C》2016年第1期37-46,共10页中国物理C（英文版）

基　　金：Supported by National Special Magnetic Confinement Fusion Energy Research,China(2015GB108001);National Natural Science Foundation of China(91226104)

摘　　要：The prompt T-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 2/ 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 y-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 ofγ-rays of energy 0.4-1 MeV and 1 3 MeV are 9.2% and 1.1%, respectively.The prompt T-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 2/ 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 y-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 ofγ-rays of energy 0.4-1 MeV and 1 3 MeV are 9.2% and 1.1%, respectively.

关 键 词：D-T neutron depleted uranium prompt γ-ray delayed γ-ray time of flight 

分 类 号：O571.5[理学—粒子物理与原子核物理]