贫化铀球装置内的^(238)U(n,2n)反应率实验研究  

Measurement of ^(238)U(n,2n) Reaction Rate in Depleted Uranium Sphere

作　　者：朱传新[1] 牟云峰[1] 郑普[1] 王新华[1] 郭海萍[1] 何铁[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2015年第10期1734-1739,共6页Atomic Energy Science and Technology

摘　　要：采用两套不同尺寸的贫化铀球装置开展了装置内部的238 U(n,2n)反应率实验研究,利用PD-300加速器D-T中子源辐照实验装置,源强变化采用伴随粒子法监测,238 U圆片放置在实验装置的45°孔道内,分布在距中子源不同距离处,辐照结束后,采用HPGe探测器测量238 U圆片活化γ射线。实验结果与蒙特卡罗程序模拟计算结果进行了比较和分析。结果表明,238 U(n,2n)反应率实验结果与模拟计算值较吻合,238 U(n,2n)反应率随球体半径r的增加,近似服从e-ar/r2分布规律。The 238 U（n,2n）reaction rates of two depleted uranium spheres were measured.The depleted uranium spheres were irradiated by D-T neutron at PD-300 accelerator.The intensity of neutron source was monitored by the associated-alpha particles from the T（d,n）He reaction.After radiation,the activated gamma rays of uranium foils in the 45°hole of uranium spheres were measured using HPGe detector.The 238 U（n,2n）reaction rates of two depleted uranium spheres were calculated using Monte-Carlo simulation.It shows that the 238 U（n,2n）reaction rates from experiments are agreed with the calculations.The change of 238 U（n,2n）reaction rate with the radius r of depleted uranium sphere is obeyed approximately the distribution of e-ar/r2.

关 键 词：贫化铀球 反应率 D-T中子 蒙特卡罗模拟 

分 类 号：O571.435[理学—粒子物理与原子核物理]