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讨论了14MeV中子引起的核反应截面测量中监督反应对测量结果的影响,同时列出了常用的一些监督反应及参数,利用截面的评价值给出了一些监督反应的截面随中子能量变化的关系曲线,并对^27Al(n,p)^27Mg反应做了定性分析,说明了监督反应的选取对反应截面测量的重要性。 It was discussed in this article that the effects of different monitors in the cross section measurements of nuclear reactions induced by 14 MeV neutrons, at the same time some monitors and correlative parameters were listed. The excitation functions of monitors are taken from the evaluatied cross sections, and a qualitative analysis has been performed for ^27Al(n,p) ^27Mg reaction. It indicates that the choice of monitor is very important for cross section measurements 相似文献
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Propagation and interaction of ion-acoustic solitary waves in a quantum electron-positron-ion plasma 下载免费PDF全文
This paper discusses the existence of ion-acoustic solitary waves and their interaction in a dense quantum electron-positron-ion plasma by using the quantum hydrodynamic equations.The extended Poincar’e-Lighthill-Kuo perturbation method is used to derive the Korteweg-de Vries equations for quantum ion-acoustic solitary waves in this plasma.The effects of the ratio of positrons to ions unperturbation number density p and the quantum diffraction parameter H e (H p) on the newly formed wave during interaction,and the phase shift of the colliding solitary waves are studied.It is found that the interaction between two solitary waves fits linear superposition principle and these plasma parameters have significantly influence on the newly formed wave and phase shift of the colliding solitary waves.The investigations should be useful for understanding the propagation and interaction of ion-acoustic solitary waves in dense astrophysical plasmas (such as white dwarfs) as well as in intense laser-solid matter interaction experiments. 相似文献
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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93Nb(n,2n)92mNb反应截面为中子注量标准对128Te(n,2n)127mTe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128Te(n,2n)127mTe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. 相似文献
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用活化法以93Nb(n,2n)92mN反应截面为中子注量标准,然后对172Yb(n,p)172Tm,173Yb(n,P)173Tm,170Yb(n,2n)160Yb,176Yb(n,2n)175Yb的反应截面进行了测量,测得由(14.84±03)MeV中子引起的173Yb(n,p)172Tm的反应截面为(9.4±L0.9)mb,173Yb(n,p)173Tm的反应截面为(3.64±0.2)mb,170Yb(n,2n)169Yb的反应截面为(2 130±81)mb,176Yb(n,2n)175Yb的反应截面分别为(2169±81)mb.把测量的数据和其他作者的数据进行了比较,且利用HFTT程序计算了中子能量在7~18 MeV范围内两个(n,2n)反应和中子能区在5~30 MeV内两个(n,p)反应的截面,给出了这4个核反应的激发函数曲线. 相似文献
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用活化法以93Nb(n,2n)92mNb和27Al(n,a)24Na反应截面为中子注量标准,对198Pt(n,2n)197m+gPt,198Pt(n, 2n)197mPt, 192Pt(n,2n)191Pt,194Pt(n,p)194Ir,195Pt(n,p)195mIr和 196Pt(n,p)196mIr反应截面进行了测量,由(13.5±0.2),(14.1±0.1)和(14.6±0.2)MeV中子引起的198Pt(n,2n)197m+gPt反应截面分别为(2038±159),(1919±73)和(1836±68)mb,198Pt(n,2n)197mPt反应截面为(974±37),(1055±39)和(1042±39)mb;由(14.1±0.1),(14.4±0.2)和(14.6±0.2)MeV中子引起的192Pt(n,2n)191Pt反应截面为(1680±103),(1810±67)和(2047±97)mb;由(14.1±0.1) 和(14.4±0.2)MeV中子引起的194Pt(n,p)194Ir反应截面为(3.8±0.4)和(5.4±0.5)mb;由(14.1±0.1),(14.4±0.2)MeV和(14.6±0.2)MeV中子引起的195Pt(n,p)195mIr反应截面为(1.0±0.2),(1.6±0.2)和(1.8±0.2)mb;由(13.5±0.2)和(14.4±0.2)MeV中子引起的196Pt(n,p)196mIr反应截面分别为(1.13±0.07)和(1.18±0.06)mb. 本工作的数据和其他一些作者的数据进行了比较. 相似文献
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