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The bremsstrahlung flux-averaged cross-sections $\langle{\sigma(E_{\rm{\gammamax}})}\rangle$ and the cross-sections per equivalent photon$\langle{\sigma(E_{\rm{\gamma max}})_{\rm{Q}}}\rangle$ were first measured forthe photonuclear multichannel reaction${^{27}\!\rm{Al}}(\gamma,\textit{x})^{22}\rm{Na}$ at end-point bremsstrahlunggamma energies ranging from 35 MeV to 95 MeV. The experiments were performedwith the beam from the NSC KIPT electron linear accelerator LUE-40 with the useof the $\gamma$-activation technique. The bremsstrahlung quantum flux wascalculated with the program GEANT4.9.2 and, in addition, was monitored by meansof the $^{100}\rm{Mo}(\gamma,n)^{99}\rm{Mo}$ reaction. The flux-averagedcross-sections were calculated using the partial cross-section $\sigma(E)$values computed with the TALYS1.95 code for different level density models.Consideration is given to special features of calculating the cross-sections$\langle{\sigma(E_{\rm{\gamma max}})}\rangle$ and $\langle{\sigma(E_{\rm{\gammamax}})_{\rm{Q}}}\rangle$ for the case of the final nucleus $^{22}\rm{Na}$production in the $^{27}\!\rm{Al}$ photodisintegration reaction via severalpartial channels $\textit{x}$: $\rm{n}\alpha + dt + npt + 2n{^{3}\rm{He}} + n2d+ 2npd + 2p3n$.

chinese physics c, high energy physics and nuclear physics/chinese physics c

Cross-sections for the ${^{27}\!\rm{al}}(\gamma,\textit{x})^{22}\rm{na}$  multichannel reaction with the 28.3 mev difference of the reaction thresholds