E≤50MeV能区核反应机制的研究

Study of Nuclear Reaction Mechanism in E≤50MeV Energy Region

本文以5—50MeV中子对^(56)Fe的反应为例,分析了E≤50MeV能区的核反应机制。计算结果表明:非弹性散射能谱的高能段分立能级部份主要是由直接反应贡献的,当能量大于30MeV时,整个非弹性散射截面也变成主要是由直接反应贡献的;对于由统计理论计算的单粒子发射截面,当入射粒子能量小于10MeV时主要由平衡发射贡献,但是当入射粒子能量等于20MeV时,则变成90%以上来自预平衡发射,当入射粒子能量小于20MeV时,第二个粒子的预平衡发射可以忽略,当入射粒子能量小于50MeV时,第三个粒子的预平衡发射可以忽略。

The contribution to the inelastic scattering spectra of discrete level part mainly comes from direct reactions. For the single-particle emission cross section calculated with the statistical theories, when the incident energy is less than 10 MeV the main contribution comes from the equilibrium emission, but when the incident energy reaches 20 MeV, more than 90% contribution comes from the pre-equilibrium emission. The contribution of the pre-equilibrium process to the second particle emission can be neglected when the incident energy is less than 20MeV and the contribution of the pre-equilibrium process to the third particle emission can be neglected when the incident energy is less than 50 MeV.