利用GEANT4和FLUKA研究质子诱发散裂反应出射中子双微分截面

GEANT4 and FLUKA Simulations of Neutron Production Double Differential Cross Sections in Proton Induced Spallation Reaction

在中高能质子诱发散裂反应相关核工程设计中,可靠的蒙特卡罗模拟程序结合核反应理论模型具有较好的理论指导意义。本工作中,利用GEANT4耦合INCL4和ABLA理论模型以及FLUKA耦合PEANUT模型模拟计算了几百MeV至几个GeV质子轰击Be,Al,Fe,W,U等靶后30°,60°,120°,150°出射角产生的散裂中子双微分截面,并与现有实验数据进行了比较。结果发现,FLUKA和GEANT4模拟计算较好地再现了Al,Fe,W,U等靶实验测量数据。然而,模拟结果明显低估了Be靶出射中子能量小于10 Me V能区的实验数据。

For the design of nuclear engineering related with medium-high energy proton induced spallation reaction, the reliable Monte Carlo simulation codes coupled with nuclear reaction models have a good theoretical guidance. In this work, the production spallation neutron double differential cross sections at 30°, 60°, 120°, 150°emission angle for Be, Al, Fe, W, U target materials at incident proton energies between several hundred Me V and Ge V are theoretically calculated by using the GEANT4 coupled INCL4 and ABLA, and the FLUKA coupled PEANUT. The calculated results were compared with the available experimental data. It is found that the GEANT4 and FLUKA calculations well reproduced the experimental measurement of Al, Fe, W, U target materials. However, calculations obviously underestimated the emission neutrons of Be target for lower than 10 Me V energy range.