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８～１３ ＭｅＶ 中子能区次级中子双微分截面的测量数据至今很少。联合使用中国原子能科学研究院建成的常规多探测器快中子飞行时间谱仪和相继创建的非常规快中子飞行时间谱仪进行了１０ ＭｅＶ中子对２３８Ｕ、２０９Ｂｉ和Ｆｅ 的次级中子双微分截面的测量，并将测量结果和理论计算结果进行了比较。
So far, the measurement data of double differential cross sections of secondary neutrons in 8-13 MeV neutron energy regions have been few. Combined with the conventional multi-detector fast neutron time-of-flight spectrometer built by China Institute of Atomic Energy and the unconventional fast neutron time-of-flight spectrometer successively created by the Institute of Atomic Energy, 10 secondary neutron pairs of 238U, 209Bi and Fe Double differential cross section measurement, and the measurement results and theoretical calculations were compared.