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 meas‐ured .The depleted uranium spheres were irradiated by D‐T neutron at PD‐300 accelera‐tor .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 simu‐lation .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 urani‐um sphere is obeyed approximately the distribution of e - ar/r2 .
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