n+^(11)B反应的理论计算和分析

Model Calculation and Analysis of n+^(11)B Reactions below 20MeV

在统一的豪泽 -费许巴赫理论和激子模型的基础上 ,利用光学模型来处理中子诱发轻核核反应的一种新理论已经产生 .利用这一新理论 ,对当入射中子En≤ 2 0MeV时n + 11B反应的所有反应截面 ,出射中子和α粒子的双微分截面进行了计算 .通过比较理论计算的各种截面 ,出射中子总的双微分截面与实验数据 。

A new model, based on unified Hauser-Feshbach and exciton model, for neutron induced light nucleus reaction has been developed. In case of E n≤20MeV, the total cross section, non-elastic cross section, elastic angular distribution, and the energy-angular spectra of outgoing neutrons in n+ 11B reaction have been calculated. Especially the double-differential cross section of outgoing neutrons particles of the 11B(n,xn) reaction are calculation. Because of strong recoil effect in light nucleus reactions, the energy balance is strictly takeninto account. In case of 11B, it has more reaction channels and complex reaction mechanism, and the two-body separations are also included in the calculation. This new model describes these characters of 11B very well. From the comparison between calculated results and experimental data, one can see that this model works well in calculation both for cross section and for energy-angular distributions of outgoing neutrons.