All cross sections of neutron induced reaction , elastic scattering angular distribution , neutron energy spectrum and double differential cross sections were calculated by using optical model and the semi - classical model of multi - step nuclear reaction processes based on the hauser - feshbach and exciton model in the energy region up to 20mev 应用光学模型和以复合核平衡态理论( hauser ? feshbach理论)及激子模型为基础的核反应多步过程的半经典理论，计算了当中子入射能量低于20mev时n + ~ ( 112120 ) sn反应的所有中子入射截面、弹性散射角分布、出射中子能谱以及出射中子双微分截面。
Scattering sections reflect some characters of interaction potential in collision systems ; therefore one can get information about interaction from the theoretical and experimental research of collision between atoms and molecules . it is especially noted that non - elastic scattering sections and single rotational - excitation sections give abundant information about orientation and repulsive potential of interaction between atom and molecules , which meant an important way as to fully investigating the interaction between atoms and molecules 散射截面反映了碰撞体系相互作用势的基本特性，从原子分子碰撞的理论及实验中能够获得有关相互作用的信息；非弹性散射截面和单个转动激发截面提供了有关原子与分子相互作用方向性和排斥势的丰富信息，是全面探索原子与分子相互作用的重要途径之一。
The calculated double differential cross section of the new model is compared with experimental data and previous scdw calculations with single particle model . the calculated cross sections are larger than those given by previous calculations at backword and forward angles and smaller than those given by previous calculations near the quasi - elastic scattering ( qes ) angle . the agreement with experimental data is much improved 新模型的双微分截面计算结果与实验值以及以前采用单粒子壳层模型时的计算结果进行了比较，表明cdfm模型的引入对scdw模型的计算结果有较大的改进，使其在大角度和极小角度区域有所增大，在准弹性散射角附近有所减小，从而能更好地与实验值相符合。
For high energy proton - proton elastic scattering , the cross section has been calculated from exchanging pomeron theory , such as these calculations have been performed for differential cross section at the energy of = 53gev and the total cross section , for differential cross section , below the momentum transform and for total cross section at s > 10 the pomeron exchange theory reproduce the experimental data very well 对于高能质子?质子弹性散射，我们利用交换pomeron理论获得其散射截面。广的帅他人学顾论义我们分别计算了在入时能挝为人53 ev的微分散射徽而和总散射截面，结果我们得剑。
