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首页> 外文期刊>Nuclear instruments and methods in physics research >Measurement of keV-neutron capture cross-sections and capture γ-ray spectra of ~(56)Fe and ~(57)Fe
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Measurement of keV-neutron capture cross-sections and capture γ-ray spectra of ~(56)Fe and ~(57)Fe

机译:keV中子俘获截面的测量和〜(56)Fe和〜(57)Fe的γ射线光谱的捕获

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The neutron capture cross-sections and the capture y-ray spectra of ~(56)Fe and ~(57)Fe have been measured in the neutron energy range from 10 to 90 keV. Pulsed keV-neutrons were produced from the ~7Li(p,n)~7Be reaction by bombarding a lithium target with a 1.5-ns bunched proton beam from a 3 MV Pelletron accelerator. The incident neutron spectrum on the capture sample was measured using a time-of-flight method with a ~6Li-glass detector. The capture y-rays emitted from an iron or standard gold sample were detected with a large anti-Compton Nal(Tl) spectrometer. The capture yield of the iron or gold sample was obtained by applying a pulse-height weighting technique to the corresponding capture γ-ray pulse-height spectrum. The capture cross-sections of ~(56,57)Fe were derived with errors less than 5% using the standard capture cross-sections of ~(197)Au. The capture γ-ray spectra were obtained by unfolding the observed capture γ-ray pulse-height spectra. The present results for the capture cross-sections were compared with the previous measurements and the evaluated values of ENDF/B-VII.0 and JENDL-3.3. The Maxwellian-averaged capture cross-sections of ~(56)Fe and ~(57)Fe at 30 keV are derived as 12.22 ± 2.06 mb and 44.48 ± 7.56 mb, respectively.
机译:在10到90 keV的中子能量范围内测量了〜(56)Fe和〜(57)Fe的中子俘获截面和俘获y射线光谱。脉冲keV中子是由〜7Li(p,n)〜7Be反应产生的,方法是用来自3 MV Pelletron加速器的1.5 ns束状质子束轰击锂靶。使用飞行时间方法和〜6Li玻璃检测器测量捕获样品上的入射中子光谱。用大型反康普顿纳尔(Tl)光谱仪检测到铁或标准金样品发出的捕获y射线。通过将脉冲高度加权技术应用于相应的捕获γ射线脉冲高度谱,可以获得铁或金样品的捕获产率。使用〜(197)Au的标准捕获截面,得出〜(56,57)Fe的捕获截面,误差小于5%。通过展开观察到的捕获γ射线脉冲高度谱来获得捕获γ射线谱。将捕获截面的当前结果与以前的测量结果以及ENDF / B-VII.0和JENDL-3.3的评估值进行比较。 30keV时〜(56)Fe和〜(57)Fe的麦克斯韦平均捕获截面分别为12.22±2.06 mb和44.48±7.56 mb。

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