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加速器驱动次临界系统(ADS)液态Pb-Bi散裂靶的设计中,需要可靠的理论计算工具精确地预言几个GeV能量范围的质子引起的散裂反应产生的各种粒子和核素。利用蒙特卡罗模拟软件包Geant4计算研究了800 MeV至3 GeV质子入射铅、铋材料引起的中子产生双微分截面。比较了Geant4不同物理模型得到的模拟结果与现有的实验数据。其中,Geant4的QGSP BERT和QGSP INCL ABLA物理模型模拟结果很好地再现了实验数据。本工作证实了Geant4蒙特卡罗模拟软件包适合用于能量高达3 GeV的质子入射铅、铋引起的中子产生双微分截面的模拟计算。
The design of an accelerator-driven subcritical liquid (Pb) -based Pb-Bi spallation target requires reliable theoretical calculation tools to accurately predict the various particles and nuclides produced by the proton-induced spallation reactions at several GeV energies. The double differential cross sections of neutron induced by lead and bismuth materials impinging on 800 MeV to 3 GeV protons were calculated using the Monte Carlo simulation package Geant4. The simulation results obtained from different Geant4 physical models are compared with the existing experimental data. Among them, Geant4 QGSP BERT and QGSP INCL ABLA physical model simulation results reproduce the experimental data well. This work confirms that the Geant4 Monte Carlo simulation package is suitable for simulations of proton-impinging lead and bismuth-induced neutron doubling differential cross sections for energy up to 3 GeV.