摘要
根据人工放射性的生长与衰变规律,推导出一个在特殊情况下用基态特征γ射线计算同质异能态反应截面的公式,并据此公式用活化法以^(93)Nb(n,2n)^(92m)Nb反应截面为中子注量标准对^(128)Te(n, 2n)^(127m)Te反应截面进行了测量．由能量为(14．1±0．2)和(14．6±0．3)MeV的中子引发的^(128)Te(n, 2n)^(127m)Te反应截面值分别为(737±69)和(853±82)mb．单能中子用T(d,n)~4He反应获得,其能量用铌锆截面比法测定．为减小热中子的(n,γ)反应的影响,在辐照过程中对样品进行了包镉处理．
According to the regulation of growing and decay of artificial radioactive nuclide, a formula used to calculate the cross section of isomerous state with characteristic gamma-ray of ground state in a special case was deduced. And the cross sections of ^128Te（n,2n）^127mTe reaction induced by neutrons around 14MeV were measured and calculated by using the activation technique and the formula deduced above. The experimental results were （737±69） and （853±82）mb at the neutron energies of （14.1±0.2） and （14.6±0.3）MeV, respectively. The samples wrapped in cadmium foil were irradiated in order to avoid the effect of （n, γ,） reaction induced by thermal neutron. The neutron energies in these measurements were determined by the method of cross-section ratios between ^90Zr（n,2n）^89m＋^g Zr and ^93Nb（n,2n） ^92mNb reactions, and the neutron fiuencies were determined by using the monitor reaction ^93Nb（n,2n） ^92mNb
出处
《高能物理与核物理》
CSCD
北大核心
2007年第7期625-628,共4页
High Energy Physics and Nuclear Physics
基金
平顶山学院高层次人才科研启动经费资助
关键词
公式
反应截面
碲
活化法
中子
formula, reaction cross-section, tellurium, activation technique, neutron
