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采用轻核反应模型计算了中子诱发9Be反应的总出射中子双微分截面。中子诱发9Be反应的所有出射中子都来自于同一反应道(n,2n)2α,该反应道有六种反应途径。本次计算中采用了发布于2004年的能级纲图,计算结果与实验在En=7.1、8.09、9.09、10.26处取得了很好的符合。但当中子入射能量达到14以及18MeV时,理论计算结果分别在出射中子能区2～5MeV以及4～8MeV与实验测量产生偏差,这是由于9Be的第9条能级E(Jπ)=7.94(5-/2)与第10条能级E(Jπ)=11.283(7+/2)之间的能级间隔达到了3.343MeV造成的,这么大的能级间隔已经远超出了9Be的平均能级间隔且也
The neutron double-differential cross-section of neutron-induced 9Be reaction was calculated using the light-nuclear reaction model. All neutron-induced neutrons of the 9Be reaction come from the same reaction channel (n, 2n) 2α. There are six reaction pathways in this channel. In this calculation, the energy level diagram released in 2004 is used. The calculated results are in good agreement with the experiment at En = 7.1, 8.09, 9.09 and 10.26. However, when the neutron incident energy reaches 14 and 18 MeV, the theoretical calculation results deviate from the experimental measurement in the exiting neutron energy region of 2 ~ 5 MeV and 4 ~ 8 MeV, respectively, because the 9th energy level E (Jπ) of 9Be is 7.94 (5- / 2) and the 10th energy level E (Jπ) = 11.283 (7 + / 2) reaches 3.343 MeV. Such a large energy level interval has far exceeded the average of 9 Be Energy level interval and also