The ²³⁹Pu(n,f)/²³⁵U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides three-dimensional reconstruction of fission-fragment ionization profiles, allowing for a precise quantification of measurement uncertainties. The measurement was performed at the Los Alamos Neutron Science Center which provides a pulsed white source of neutrons. The data are recommended to be used as a cross-section ratio shape. A discussion of the status of the absolute normalization and comparisons to ENDF evaluations and previous measurements is included.

中文翻译：

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使用 NIFFTE 裂变时间投影室测量 239Pu(n,f)/235U(n,f) 横截面比

在²³⁹浦（N，F）/ ²³⁵ U（N，F）的横截面比已经与裂变时间投影腔（fissionTPC）从100千电子伏到100兆电子伏进行测量。fissionTPC 提供裂变碎片电离剖面的三维重建，允许对测量不确定性进行精确量化。测量是在洛斯阿拉莫斯中子科学中心进行的，该中心提供脉冲白中子源。建议将数据用作横截面比率形状。包括绝对标准化状态的讨论以及与 ENDF 评估和先前测量的比较。