摘要
文章作者采用核活化法和核裂变法实验研究了加速器D-T中子、D-D中子以及252Cf自发裂变中子在纯水泥体上的反射中子,获得了反射中子引起的6种高阈能活化箔的活化反应率以及235U(包镉)和238U裂变反应率.采用反冲质子法测量了4种厚度(4.5,9,18,27cm)聚乙烯板的角度中子谱.获得了聚乙烯铁铍组合壳体内距装置中心0,9.7,12.8和17.3cm 4个位置1MeV以上的中子能谱。采用铝核素标准截面相对测量法,获得了175Lu、89Y核素的(n,2n)反应截面。文章还分析了实验的不确定度.
The reflected neutrons from pure cement bombarded by D-T and D-D fusion neutrons, and ^252 Cf spontaneous fission neutrons were studied using the methods of nuclear activation and uranium fission. The absolute activation reaction rates of six kinds of foils with high threshold energy, and the absolute fission reaction rates of ^235U （wrapped by cadmium） and ^238U nuclides, were measured. The angular neutron spectra from polyethylene slabs with thicknesses of 4.5, 9, 18, and 27cm were measured using the method of proton recoil. The neutron energy spectra above 1MeV were also measured this way in the multi-shell assembly which was made of beryllium, stainless steel and polyethylene. The measuring positions were 0, 9.7,12.8 and 17.3cm away fron the center of the assembly. By the relative measurement method with an Al sample, the （n, 2n） reaction cross sections of Ru and Y nuclides were obtained. The experimental uncertainties in all the results were analyzed.
出处
《物理》
CAS
北大核心
2009年第12期889-893,共5页
Physics
基金
中国工程物理研究院科学基金(批准号:990212)资助项目
关键词
反射中子
中子角度谱
介质内中子能谱
反应截面
reflected neutron, angular neutron spectrum, neutron spectra in medium, reaction cross section
