Study of some systematic trends and non-equilibrium effects in (n,2n) reactions for nuclei far from the symmetry line
Study of some systematic trends and non-equilibrium effects in (n,2n) reactions for nuclei far from the symmetry line
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DOI：
10.1088/0305-4616/2/6/009
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发表时间：
1976-06
期刊：
影响因子：
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通讯作者：
E. Holub;N. Cindro
中科院分区：
文献类型：
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作者：
E. Holub;N. Cindro
用活化技术和Ge（Li）探测系统测量了~（84）Sr，~（86）Sr，~（88）Sr，~（93）Nb，~（113）In，~（134）Ba和~（136）Ba在14.6+或-0.3MeV能量下的总（n，2n）截面。在统计理论的基础上，利用移动费米气体模型和超导模型计算了同质异能态截面比。理论结果与实验数据进行了比较。在某些情况下（88 Sr、93 Nb、109 Ag、134 Ba、136 Ba和138 Ba），无法测量总截面，因此使用同分异构截面比的理论预测来确定总（n，2n）截面。本文用剩余激发能为常数时剩余核（N-Z）R的中子过剩量分析了本工作和最近文献中得到的截面数据。
Total (n,2n) cross sections at 14.6+or-0.3 MeV for the 84Sr, 86Sr, 88Sr, 93Nb, 113In, 134Ba and 136Ba targets were measured using the activation technique and a Ge(Li) detection system. Isomeric cross section ratios were calculated on the basis of the statistical theory using the shifted Fermi-gas and superconductivity models. Theoretical results are compared with experimental data. In several cases (88Sr, 93Nb, 109Ag, 134Ba, 136Ba and 138Ba) it was not possible to measure total cross sections, and therefore the theoretical prediction of the isomeric cross section ratio was used to determine the total (n,2n) cross section. The cross section data obtained in this work and other recent literature data are analysed in terms of the neutron excess of residual nuclei (N-Z)R at a constant value of the residual excitation energy.