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￣９Ｂｅ（ｎ，２ｎ）反应中子的能量角度双微分谱在实际应用中有重要意义。将￣９Ｂｅ（ｎ，２ｎ）反应视为具有不同反应机制的核反应过程，即两步非弹级联衰变和三体直接崩裂过程，利用动力学和准自由散射方法，导出相应于两个过程的能量角度双微分谱，并用Ｔｅｐｅｌ－Ｗｅｉｄｅｎｍｕｌｌｅｒ统计模型的改进形式计算跃迁分截面。通过适当选择￣９Ｂｅ、￣８Ｂｅ核的结构参数，及对两核的能级宽度和能量的实验分辨率效应做高斯型分布的平均，计算、分析了１４．２，１０．ｌＭｅＶ入射中子在一些角度上的双微分中子产生截面。结果与实验符合较好。
~ 9Be (n, 2n) reaction neutron energy angle dual differential spectrum in the practical application of great significance. The reaction of 9Be (n, 2n) is regarded as a nuclear reaction process with different reaction mechanisms, that is, the two-step non-elastic cascade decay and the three-body direct cracking process. By using the kinetic and quasi-free scattering methods, Energy differential spectrum, and calculate the transition cross-section using a modified version of the Tepel-Weidenmuller statistical model. By proper selection of the structural parameters of ¯9Be and ¯8Be nuclei and the average of the Gaussian distribution of the experimental resolution effects of the energy levels of the two cores, we calculated and analyzed 14.2,10. Double differential neutron production cross section of lMeV incident neutrons at some angles. The result is in good agreement with the experiment.