摘要
为校验次临界能源堆的概念设计,在R19.4/30.0cm的贫铀球壳装置上采用活化法开展14MeV中子学积分实验.布放6片贫铀活化片于球壳中与入射D离子束90°方向上的不同位置处活化,用HPGe探测器测量^(238)U(n,γ)反应、^(238)U(n,f)及^(235)U(n,f)反应和^(238)U(n,2n)各反应产物发射的特征γ射线,得到了相应的反应率.^(238)U(n,γ)反应率的不确定度为3.6%—3.7%,^(238)U(n,f)和^(235)U(n,f)反应率的不确定度为5.1%—5.9%,^(238)U(n,2n)反应率的不确定为4.3%—4.7%.用MCNP5程序在ENDF66c数据库下进行模拟计算,^(238)U(n,γ)反应率的计算值/实验值(C/E)为0.972—1.034,^(238)U(n,f)和^(235)U(n,f)反应率的C/E为0.983—1.058,^(238)U(n,2n)反应率的C/E为0.979—1.019.
Aiming at checking the conceptual design of the subcritical reactor, an experiment using activation technique was carried out on a depleted uranium shell of R19.4/30.0 cm with D-T neutrons. The 6 depleted uranium foils were activated at 90° with respect to the incident D beam in the shell, and distributions of 238^U (n, γ) reaction rates, 238^U (n, f) reaction rates, 238^U (n, f) reaction rates and 238^U (n, 2n) reaction rates were obtained, by measuring characteristic γ rays generated by corresponding uranium reactions. The relative uncertainties are 3.6%–3.7% for 238^U (n, γ) reaction rates, 5.1%–5.9% for 238^U (n, f) reaction rates and 238^U (n, f) reaction rates, and 4.3%–4.7% for 238^U (n, 2n) reaction rates. The experiment was simulated using MCNP5 code with ENDF66c library, and the calculation-to-experiment ratios are 0.972–1.034 for 238^U (n, γ) reaction rates, 0.983–1.058 for 238^U (n, f) reaction rates and 238^U (n, f) reaction rates, and 0.979–1.019 for 238^U (n, 2n) reaction rates.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第2期178-184,共7页
Acta Physica Sinica
基金
ITER计划专项国内配套研究(批准号:2010GB111002)
中国工程物理研究院科技发展基金(批准号:2011B0103014)资助的课题~~
关键词
D—T中子
铀反应率
蒙特卡罗模拟
次临界能源堆
D-T neutron, uranium reaction rates, Monte Carlo simulation, subcritical reactor