| 国产Am-Be中子源能量低于1.5MeV中子所占份额的实验测定 |
| |
| 引用本文： | 陈金象,朱培,李永明,刘镇洲,张国辉.国产Am-Be中子源能量低于1.5MeV中子所占份额的实验测定[J].原子能科学技术,2008,42(5):475-480. |
| |
| 作者姓名： | 陈金象 朱培 李永明 刘镇洲 张国辉 |
| |
| 作者单位： | 北京大学 ;物理学院 重离子物理教育部重点实验室，北京 100871 |
| |
| 摘 要： | 本工作提出了测定Am Be中子源发射的能量低于1.5MeV中子所占份额的1种实用实验方法。用4.438MeVγ射线伴随的飞行时间法测量了中子源的局部中子谱（n1群中子）。通过已准确测量的中子源发射4.438MeVγ射线与中子强度的比值(R=Rγ/Sn)和n1群中子谱与测量的能量为1.5MeV以上中子总谱在3.2MeV能量处归一后的面积比值，求得国产Am-Be中子源能量低于1.5MeV中子的所占份额为(19.1±1.9)%。
|
| 关 键 词： | 241Am-9Be中子源" target="_blank">241Am-9Be中子源')">241Am-9Be中子源 中子能谱 飞行时间法 |
| 文章编号： | 1000-6931(2008)05-0475-06 |
| 收稿时间： | 2007-06-01 |
| 修稿时间： | 2007年6月1日 |
Experimental Determination of Fraction of Neutrons Below 1.5 MeV for Am-Be Neutron Source |
| |
| CHEN Jin-xiang,ZHU Pei,LI Yong-ming,LIU Zhen-zhou,ZHANG Guo-hui.Experimental Determination of Fraction of Neutrons Below 1.5 MeV for Am-Be Neutron Source[J].Atomic Energy Science and Technology,2008,42(5):475-480. |
| |
| Authors: | CHEN Jin-xiang ZHU Pei LI Yong-ming LIU Zhen-zhou ZHANG Guo-hui |
| |
| Affiliation: | Key Laboratory of Heavy Ion Physics, Ministry of Education, Peking University, Beijing 100871, China ; |
| |
| Abstract: | A practical method for experimentally determining the fraction of neutrons below 1.5 MeV for the Am-Be neutron source is described. The partial neutron spectrum (the n1 group) was measured by time of flight accompanied with the 4.438 MeV γ-ray. The fraction of neutrons below 1.5 MeV was derived from the 4.438 MeV γ-ray to total neutron ratio and the ratio of the area of the n1 group spectrum to the measured total spectrum above 1.5 MeV normalized at the peak near 3.2 MeV. The fraction of neutrons with energies below 1.5 MeV amounts to (19.1±1.9)% for the Chinese-made Am-Be neutron source. |
| |
| Keywords: | Am-Be neutron source neutron spectrum time-of-flight |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《原子能科学技术》浏览原始摘要信息 |
|
点击此处可从《原子能科学技术》下载全文 |
