⁹Be(p,xn) and ⁷Li(p,xn) are two reactions for the accelerator-based compact neutron source at low energy protons conditions, especially for BNCT facilities and it is necessary to simulate the beam characteristics accurately. The different reference physics lists recommended by GEANT4 have been used to calculate the neutron beam characteristics for the ⁹Be and ⁷Li targets bombarded by proton beams of 5 ∼ 10 MeV and the accuracy of GEANT4 simulations has been discussed. By comparing with the reference data such as experimental data, MCNP6 simulations and numerical calculations, the results calculated by QGSP_BIC_AllHP show good agreement with a relative error of less than 10%. The neutron yields level out and have a tendency to move forward, when the thickness is greater than the range of protons in targets. However, the neutron yields are significantly underestimated by other physics lists except for QGSP_BIC_AllHP. In addition, two fitted curve equations are acquired to quickly estimate the neutron yield for ⁹Be and ⁷Li targets below 20 MeV. Therefore, due to the limitation of the particle type and energy range in this study, GEANT4 with QGSP_BIC_AllHP is recommended to calculate hadronic interactions of protons with matter below 20 MeV.

⁹ Be(p,xn) 和⁷ Li(p,xn) 是基于加速器的紧凑中子源在低能质子条件下的两种反应，特别是对于 BNCT 设施，需要准确模拟束流特性。GEANT4 推荐的不同参考物理列表已被用于计算⁹ Be 和⁷讨论了被 5 ∼ 10 MeV 质子束轰击的 Li 目标和 GEANT4 模拟的准确性。通过与实验数据、MCNP6模拟和数值计算等参考数据的对比，QGSP_BIC_AllHP计算的结果具有良好的一致性，相对误差小于10%。当厚度大于目标中质子的范围时，中子产量趋于平稳并有向前移动的趋势。然而，除了 QGSP_BIC_AllHP 之外，其他物理列表都大大低估了中子产额。此外，获得了两个拟合曲线方程来快速估计⁹ Be 和⁷的中子产额Li 的目标是低于 20 MeV。因此，由于本研究中粒子类型和能量范围的限制，建议使用带有 QGSP_BIC_AllHP 的 GEANT4 来计算质子与低于 20 MeV 的物质的强子相互作用。