共查询到19条相似文献,搜索用时 218 毫秒
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用中子活化法相对于54Fe(n,P)54Mn反应,在13.50—14.80MeV中子能区测量了Ba(n,x)134Cs,134Ba(n,2n)133Ba,140Ce(n,2n)139Ce,142Ce(n,2n)141Ce和23Na(n,2n)22Na的反应截面.并将所测的结果和其他作者的结果进行了比较,中子能量是用90Zr(n,2n)89m+gZr反应和93Nb(n,2n)92mNb反应截面比法测定的. 相似文献
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报道了在13.5—14.6MeV中子能区用活化法测得的160Gd(n,2n)159Gd和158Gd(n,p)158Eu的
反应截面值. 中子注量用93Nb(n, 2n)92m Nb反应截面得到. 由(13.5±0.2)MeV,(14.1±0.1)MeV和(14.6±0.2)MeV中子引起的160Gd(n, 2n) 159Gd反应截面值分别为(1940±83)mb, (2324±92)mb和(1983±77)mb, 158Gd(n, p) 158Eu反应截面值分别为(1.9±0.1)mb, (2.1±0.1)mb和(3.5±0.1)mb. 单能中子由T(d, n)4He反应获得.文中还列举了已收集到的数据以作比较. 相似文献
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在统计理论及考虑角动量守恒的激子模型的基础上,运用Monte Carlo方法计算(n,20)反应同质异能态截面比. 以59Co(n,2n)58Co、93Nb(n,2n)92Nb和181Ta(n,2n)180Ta的3个反应道为例,计算从其阈能到20MeV能区的同质异能态截面比,并和已有实验数据做了比较,结果符合较好. 这表明本文提供的方法是计算(n,2n)反应同质异能态截面比的一种有效方法. 相似文献
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107Ag(n,2n)106mAg反应截面测量 总被引:1,自引:0,他引:1
本文报告了En=13.50—14.73MeV中子能区用活化法以27Al(n,2)24Na截面为中子注量标准得的107Ag(n,2n)106mAg的反应截面.在En=13.50,13.60,13.90,14.10,14.35,和14.73MeV处的截面分别为469±22,480±22,503±24,538±25,555±25和572±26mb.在文中还列举了一些国外已发表的截面数据以作比较.中子能量用铌锆活度比法测定. 相似文献
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Measurement of Cross Sections for Pb(n,x)203Hg,W(n,x)182Ta and W(n,x)183Ta Reactions Induced by 14 MeV Neutrons
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The cross sections for Pb(n,x)203Hg,W(n,x)l82Ta and W(n,x)183Ta reactions have been measured by the activation method. The neutron fluences were determined by the cross sections of 93Nb (n,2n)92mNb reaction. The neutron energies in the measurements were determined by the cross section ratios of Zr(n,2n)89m+gZr and Nb(n,2n)92mNb reactions. 相似文献
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The cross sections of Ni(n,x)58(m+g)CO,Ni(n,x)80mCo,Ni(n,x)61Co and Ni(n,x)62mCo reactions induced by neutrons around [14]MeV were measured in this work and calculated by a previously developed formula in this work.The neutron flux was determined using the monitor reaction 27Al(n,α)24Na and the neutron energies were measured with the method of cross-section ratios for 89Zr(n,2n)89Zr to 93Nb(n,2n)92mNbreactions. 相似文献
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WANG Yong-Chang YUAN Jun-Qian YANG Jing-Kang KONG Xiang-Zhong REN Zhong-Liang WANG Hua-Min 《中国物理C(英文版)》1992,16(8):731-735
Measurement of (n,2n) reaction cross sections for some nuclides,whose residues have long half-lives,is described.The activation method relative to the 93Nb(n,2n)92mNb reaction cross section was used.The cross sections of the 151Eu(n,2n)150mEu、153Eu(n,2n)152Eu、159Tb(n,2n)158Tb and 109Ag(n,2n)108mAg reactions in the neutron energy range of 13.50—14.80MeV were measured.The neutron energies in this experiment were determined by means of the method of cross section ratios for 90Zr(n,2n)89m+gZr and 93Nb(n,2n)92mNb reactions.The results obtained were compared with other existing data. 相似文献
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Cross sections for some (n,d*),(n,t) and (n,n'α)reactions have been measured by using the activation method relative to cross sections of 27Al(n,α)24Na or 93Nb(n,2n)92mNb reactions in neutron energies around 14MeV.In this paper some of the published cross section data have also been listed and compared with our results.The neutron energies were determined by the method of cross section ratios for the reactions of 90Zr(n,2n) 89m+gZr and 93Nb(n,2n)92mNb. 相似文献
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The (d, n) reaction on 90Zr and 96Zr has been studied at 12 MeV deuteron bombarding energy using the neutron time-of-flight technique with an overall neutron time resolution of 1.9 ns. Angular distributions of neutron groups leading to states in 91Nb and 97Nb were measured in the angular range between 15° and 60°. The measured cross sections were analyzed in the framework of the distorted-wave theory of stripping reactions to deduce l-values and proton spectroscopic factors of states in the residual nuclei. The results are compared with the corresponding data available from (3He, d) studies. The fractionation of the single-particle proton states and their centroid energies are determined. 相似文献
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《Radiation measurements》2009,44(1):68-71
The cross-sections of 165Ho(n,2n)164gHo and 180W(n,2n)179gW reactions induced by neutrons around 14 MeV were measured using activation technique and calculated by a previously developed formulas, in which the neutron flux was determined using the monitor reaction 93Nb(n,2n)92mNb. Because both of the excited and ground states were produced in each of the two reactions, one formula was introduced to take out the effect from excited state. Comparison between this work and old data were given. 相似文献
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The Cross Section Measurement for the Reactions of 48,46Ti(n,p) 48,46Sc 50Ti(n,α) 47Ca and 58Ni (n,2n) 57Ni 58Ni(n,p)58m+gCo
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The cross sections for the 50Ti(n,α)47Ca,46Ti(n,p)46Sc、48Ti(n,p)48Sc and 58Ni(n,2n)57Ni 58Ni(n,p)58m+gCo reactions have been measured by using the activation method relative to the cross sections of the 27Al(n,α)24Na reaction in the neutron energy range of 13.50—14.81MeV.The neutron energies were determined by the cross section ratios of the 90Zr(n,2N) 89m+gZr and 93Nb (n,2n) 92mNb reactions.The results obtained are compared with the published and to be published data of several authors. 相似文献
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A formula used to subtract the effect of gamma-ray of the others to that of measured reaction in measurement of cross section of nuclear reaction and its application
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ZHOU Feng-Qun YANG Xing-Qiang WANG Wei-Feng LI Yong ZHANG Fang TUO Fei KONG Xiang-Zhong 《中国物理C(英文版)》2008,32(11):873-876
Abstract According to the regulation of growing and decay of artificial radioactive nuclide, a formula used to subtract the effect of characteristic γ-ray of the others to that of measured reaction was deduced. And then the cross sections of 120Te (n, 2n)119mTe reaction induced by neutrons around 14 MeV were measured by activation relative to the 93Nb (n, 2n)92mNb. In the process of the cross sections measured to be calculated, it was subtracted that the effect of characteristic γ-ray of 126Te (n, p)126Sb to that of measured 120Te (n, 2n)119mTe reaction using the formula deduced. The experimental results were (689±37) and (750±41) mb at the neutron energies of (13.5±0.3) and (14.6±0.3) MeV, respectively. Measurements were carried out by γ-detection using a coaxial HPGe detector. As samples, spectroscopically pure tellurium powder has been used. The fast neutrons were produced by the T(d, n)4He reaction. The neutron energies in these measurements were determined by the method of cross-section ratios between 90Zr (n, 2n) 89m+gZr and 93Nb (n, 2n) 92mNb reactions. 相似文献