在$E_{\rm{γmax}}$ = 40 $÷$ 95 MeV下的${^{27}\!\rm{Al}}(γ,\textit{x})^{24}\rm{Na}$多粒子反应的横截面
Cross-sections for the ${^{27}\!\rm{Al}}(γ,\textit{x})^{24}\rm{Na}$ multiparticle reaction at $E_{\rm{γmax}}$ = 40 $÷$ 95 MeV
摘要：
测量了韧致辐射终点能量从40 MeV到95 MeV的光核多粒子反应$^{27}\!\rm{Al}(γ,\textit{x}; \textit{x} = {^{3}\rm{He}} + pd + 2pn)^{24}\rm{Na}$的韧致辐射通量平均截面$\langle{σ(E_{\rm{γmax}})}\rangle$和每当量光子的截面$\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$。使用来自NSC KIPT电子线性加速器LUE-40的束流，使用$γ$活化技术进行实验。韧致辐射量子通量用程序GEANT 4计算，此外，通过$^{100}\rm{Mo}(γ,n)^{99}\rm{Mo}$反应监测。截面$σ(E)$是使用具有默认选项的TMENS1.9代码计算的。测量的平均截面$\langle{σ(E_{\rm{γmax}})}\rangle$和$\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$似乎比理论结果高2.0至2.4倍。实验结果与其他实验室的数据吻合较好。考虑到特殊功能的计算$\langle{σ(E_{\rm{γmax}})}\rangle$和$\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$的$^{27}\!\rm{Al}(γ,\textit{x})^{24}\rm{Na}$反应，发生三个$^{27}\!\rm{Al}$光致衰变通道。本文还讨论了利用$^{27}\!\rm{Al}(γ,\textit{x})^{24}\rm{Na}$反应监测30 MeV以上光子能区韧致辐射$γ$ -量子通量的可能性。
英文摘要：
The bremsstrahlung flux-averaged cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle$ and the cross-sections per equivalent photon $\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$ were measured for the photonuclear multiparticle reaction $^{27}\!\rm{Al}(γ,\textit{x}; \textit{x} = {^{3}\rm{He}} + pd + 2pn)^{24}\rm{Na}$ at bremsstrahlung end-point energies ranging from 40 MeV to 95 MeV. The experiments were performed using the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of the $γ$-activation technique. The bremsstrahlung quantum flux was calculated with the program GEANT4 and, in addition, was monitored by means of the $^{100}\rm{Mo}(γ,n)^{99}\rm{Mo}$ reaction. The cross-sections $σ(E)$ were computed using the TALYS1.9 code with the default options. The measured average cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle$ and $\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$ have appeared to be higher by factors of 2.0 to 2.4 than the theoretical results. The experimental results have been found to be in good agreement with the data of other laboratories. Consideration is given to special features of calculation of $\langle{σ(E_{\rm{γmax}})}\rangle$ and $\langle{σ(E_{\rm{γmax}})_{\rm{Q}}}\rangle$ for the $^{27}\!\rm{Al}(γ,\textit{x})^{24}\rm{Na}$ reaction, with occurrence of three $^{27}\!\rm{Al}$ photodisintegration channels. The paper also discusses the possibility of using the $^{27}\!\rm{Al}(γ,\textit{x})^{24}\rm{Na}$ reaction for monitoring the bremsstrahlung $γ$-quantum flux in the photon energy region above 30 MeV.
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