A thin film B-10 sample for measuring the atom number

作者：Zhang Jiaguo; Wu Hao; Zhang Guohui^*

来源：Nuclear Science and Techniques, 2010, 21(2): 114-117.

• B-10 thin film sample
• Reference B-10 sample
• B-10 atom number
• Gridded ionization chamber

In order to measure differential cross sections of the B-10(n,alpha)Li-7 reaction induced by MeV neutrons using the forward-backward coincidence method, a thin film B-10 sample was designed and the B-10 atom number was determined with a reference B-10 film sample. Alpha counts of the B-10(n(th),alpha)Li-7 reaction from the B-10 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)He-3 reaction on a 4.5 MV Van de Graaff. The neutron flux was normalized by measuring the fission yield of a small U-238 fission chamber.

• 出版日期2010-4-20
• 单位北京大学; 核物理与核技术国家重点实验室