快中子在Li核上的弹性散射微分截面

用伴随粒子飞行时间法测量了14.7MeV中子在⁶Li和⁷Li核上的弹性散射截面,并用蒙特卡罗方法对中子在样品中的通量衰减、多次散射作了修正.本文工作与他人工作以及理论数据作了比较.给出了截面的勒让德系数;截面实验点总误差在10%到15%之间,其中统计误差为1%-5%.

The Differential Cross Section of Elastic Scattering of Fast Neutrons on Li

The differential cross section of fast neutrons on 6Li and 7Li has been measured at 14.7MeV using associated particle time-of-flight technique.Scattered neutrons are detected at 9 angles from 35 to 115 deg in massively shielded ST451 liquid scintillator located 254cm from the scattering sample.The efficiency curve of neutron detector was determined by measuring the n-p scattering in polyethylence. The total error of the differential cross section is from 10% to 15% including the statistical error of 1.0-5.0%and the measurment error of efficiency curve of 6.0%7.5 %.