In this work, the differential cross-sections of ${}^{151}\mathit{Eu}(\gamma ,n){}^{150}\mathit{Eu}$ and ${}^{153}\mathit{Eu}(\gamma ,n){}^{152}\mathit{Eu}$ photonuclear reactions in the giant dipole resonance region (GDR) were considered by theoretical models available in Talys 1.8 code. Isomeric ratios of these two reactions induced by bremsstrahlung with end-point energies in (GDR) region were then simulated using the calculated cross-section in combination with Monte-Carlo simulation using Geant4 toolkit based code which was implemented to simulate bremsstrahlung and photonuclear reaction. Moreover, a simple model was added into Geant4 for populating multi-isomeric states. The theoretical results were compared with the experimental data from the existing literature to examine the validity of the theoretical modes.

在这项工作中，微分截面 ${}^{151}\mathit{欧洲联盟}（\gamma ，ñ）{}^{150}\mathit{欧洲联盟}$ 和 ${}^{153}\mathit{欧洲联盟}（\gamma ，ñ）{}^{152}\mathit{欧洲联盟}$Talys 1.8代码中可用的理论模型考虑了巨大偶极子共振区域（GDR）中的光核反应。然后使用计算出的横截面，结合Geant4工具箱基于代码的Monte-Carlo模拟，模拟了致辐射在端点能量（GDR）范围内引起的这两个反应的异构体比率，该代码基于Geant4工具包，该代码被实现为模拟致辐射和光核反应。此外，在Geant4中添加了一个简单模型来填充多异构状态。将理论结果与现有文献的实验数据进行比较，以检验理论模式的有效性。