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Measurements of neutron capture cross-sections for 187Re isotope around 14 MeV neutrons and theoretical calculations of excitation functions
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms ( IF 1.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.nimb.2020.11.012
Yueli Song , Fengqun Zhou , Xinyi Chang , Yong Li , Xiaopeng Zhang , Pengfei Ji , Shuqing Yuan

The cross-sections of the 187Re(n,γ)188mRe and 187Re(n,γ)188gRe reactions were measured at the four neutron energies of 13.5, 14.1, 14.4 and 14.8 MeV through the activation method and using off-line γ-ray spectrometry. The previously developed formulas were used to subtract the effects of γ rays with close energies and the contribution from the excited state. A high-resolution γ-ray spectrometer with high-purity germanium detector was used to measure the induced γ activities. The simulation computations of the excitation functions concerning the above-mentioned two nuclear reactions were performed by adopting the nuclear theoretical model program system Talys-1.9. The theoretical excitation curves in the incident neutron energy range from 2.53 × 10−8 to 20 MeV were acquired. The fitting line of our results in the neutron energy range of 13.5–14.8 MeV, within experimental uncertainty, agrees very well with the theoretical excitation curve based on the computer code Talys-1.9.



中文翻译:

14 MeV中子周围187 Re同位素的中子俘获截面测量和激发函数的理论计算

所述的横截面187的Re(N,γ)188米Re和187 Re(N个数,γ)188克通过活化方法并使用离线γ射线光谱法,在四个中子能量分别为13.5、14.1、14.4和14.8 MeV的条件下测量了反应。先前开发的公式用于减去具有接近能量的γ射线的影响以及激发态的贡献。带有高纯度锗探测器的高分辨率γ射线光谱仪用于测量诱导的γ活性。采用核理论模型程序系统Talys-1.9,对涉及上述两个核反应的激发函数进行了仿真计算。在入射中子能量范围为2.53×10 -8时的理论激励曲线到20 MeV。在实验不确定性范围内,我们的结果在13.5–14.8 MeV中子能范围内的拟合线与基于计算机代码Talys-1.9的理论激励曲线非常吻合。

更新日期:2020-12-01
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