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Photonuclear reactions ${^{65}\rm{Cu}}(γ,n)^{64}\rm{Cu}$ and ${^{63}\rm{Cu}}(γ,xn)^{63-x}\rm{Cu}$ cross-sections in the energy range $E_{\rm{γmax}}$ = 35-94 MeV

The bremsstrahlung flux-averaged cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle$ for the photonuclear reactions ${^{65}\rm{Cu}}(γ,n)^{64}\rm{Cu}$, ${^{63}\rm{Cu}}(γ,n)^{62}\rm{Cu}$, ${^{63}\rm{Cu}}(γ,2n)^{61}\rm{Cu}$ and ${^{63}\rm{Cu}}(γ,3n)^{60}\rm{Cu}$ have been measured in the range of bremsstrahlung end-point energies $E_{\rm{γmax}}$ = 35-94 MeV. The experiments were performed with the electron beam from the NSC KIPT linear accelerator LUE-40 with the use of the activation and off-line $γ$-ray spectrometric technique. The calculation of the flux-average cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{th}}$ was carried out using the cross-section $σ(E)$ values from the TALYS1.95 code with the default options. It is shown that the experimental average cross-sections for the reactions ${^{65}\rm{Cu}}(γ,n)^{64}\rm{Cu}$, ${^{63}\rm{Cu}}(γ,n)^{62}\rm{Cu}$, ${^{63}\rm{Cu}}(γ,2n)^{61}\rm{Cu}$ are systematically higher than the theoretical estimates in the TALYS1.95 code. The obtained $\langle{σ(E_{\rm{γmax}})}\rangle$ supplement the data of different laboratories for the case of reactions $(γ,n)$ and $(γ,2n)$. For the reaction ${^{63}\rm{Cu}}(γ,3n)^{60}\rm{Cu}$, the values of $\langle{σ(E_{\rm{γmax}})}\rangle$ were measured for the first time.