A thin film ^(10)B sample for measuring the atom number  

作　　者：ZHANG Jiaguo WU Hao ZHANG Guohui 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beo＇ing 100871, China

出　　处：《Nuclear Science and Techniques》2010年第2期114-117,共4页核技术（英文）

基　　金：Supported by National Natural Science Foundation of China (10575006 and 10811120014) and China Nuclear Data Center

摘　　要：In order to measure differential cross sections of the 10B(n,α)7Li reaction induced by MeV neutrons using the forward-backward coincidence method, a thin film 10B sample was designed and the 10B atom number was determined with a reference 10B film sample. Alpha counts of the 10B(nth,α)7Li reaction from the 10B thin film and the reference sample were measured using a gridded ionization chamber and thermal neutrons, which were moderated and thermalized by paraffin from fast neutrons produced in D(d,n)3He reaction on a 4.5 MV Van de Graaff. The neutron flux was normalized by measuring the fission yield of a small 238U fission chamber.In order to measure differential cross sections of the ^10B（n,α）TLi reaction induced by MeV neutrons using the forward-backward coincidence method, a thin film ^10B sample was designed and the ^10B atom number was determined with a reference ^10B film sample. Alpha counts of the ^10B（nth,C07Li reaction from the ^10B thin film and the reference sample were measured using a gridded ionization chamber and thermal neutrons, which were moderated and thermalized by paraffin from fast neutrons produced in D（d,n）^3He reaction on a 4.5 MV Van de Graaff. The neutron flux was normalized by measuring the fission yield of a small 238U fission chamber.

关 键 词：样品测量 薄膜样品 原子数 屏栅电离室 核反应 微分截面 中子通量 热中子 

分 类 号：O6-041[理学—化学] TL271[核科学技术—核燃料循环与材料]