摘要
Cross sections of the 10B(n,α)7Li reaction(including the total,the“leaking”alpha,forward alpha and backward alpha parts)at En=4.0 and 5.0 MeV were measured using an asymmetrical twin gridded ionization chamber and two back−to-back 10B samples.Measurements were performed at the 4.5 MV Van de Graaff accelerator of Peking University.Monoenergetic neutrons were produced through the ^(2)H(d,n)3He reaction with a deuterium gas target.Absolute neutron flux was determined by a ^(238)U sample set inside the gridded ionization chamber and a BF_(3) long counter was employed as a neutron flux monitor and for normalization.The present results are compared with previous measurements and evaluations.
基金
by the National Natural Science Foundation of China under Grant No 10875006
the National Basic Research Program of China under Grant No 2008CB717803
China Nuclear Data Center and the Science and Technology on Nuclear Data Laboratory.
