摘要
介绍了铜活化诊断氘氚中子产额的测量原理,分析了^62 Cu和^64 Cu两种活化核素在符合测量中的贡献。针对不同范围内的中子产额测量,提出了系统灵敏度相对标定法和^64 Cu活化核标定法。通过添加中子屏蔽锥测量了标定场所散射中子影响。计算评估了^63 Cu（n,γ）^64 Cu反应过程对活化测量的影响。在神光Ⅲ主机装置上,利用该系统测量了直接驱动氘氚中子产额。实验结果表明：氘氚中子产额在10^9-10^13范围采用相对标定方法较为合适^,64 Cu活化核的标定方法适用于10^12-10^16范围内产额测量。标定场所散射中子对灵敏度标定因子影响约0.4%。^63 Cu俘获辐射反应在^64 Cu活化核标定中贡献小于1%。目前神光Ⅲ主机装置直接驱动氘氚中子产额约8×10^12。
This paper presents the principle of DT neutron yields diagnostic by copper activation and analyses the contributions of two kinds of nuclei ^62 Cu and ^64 Cu in the coincidence measurement.Two calibration methods of the diagnostic system are introduced for different ranges of neutron yields,which are the relative method and the ^64 Cu nuclei method.The scattered neutron of the accelerator room is measured by placing apolypropylene shield in front of a copper sample.The effect of the reaction^ 63 Cu（n,γ）^64 Cu on the copper activation measurement is calculated and evaluated.This system is used to measure neutron yields from directly-driven implosions on Shenguang-Ⅲlaser facility.The experimental results show the relative method and the ^64 Cu nuclei method are fit in the range of DT neutron yield 10^9-10^13 and 10^12-10^16,respectively.The effect of the scattered neutrons from the accelerator room on the calibrated sensitivity is about 0.4%,and the contribution of^ 63 Cu capture reaction on the calibrated sensitivity using the ^64 Cu nuclei method is less than 1%.At present,DT neutron yields from directly-driven implosions on Shenguang-Ⅲlaser facility is about 8×10^12.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第11期95-99,共5页
High Power Laser and Particle Beams
关键词
内爆
中子产额
铜活化
灵敏度标定
implosion
neutron yield
copper activation
sensitivity calibration
