Search for the process $e^{+}{e}^{-}\to {\eta }^{\mathit{\prime }}\gamma$ in the energy range $\sqrt{s}$ = 1.075 -- 2 GeV

The results of the search for the $e^{+}{e}^{-}\to {\eta }^{\mathrm{\prime }}\gamma$ process in the center-of-mass energy range from 1.075 to 2 GeV are presented. We analyze data with an integral luminosity of 746 pb${}^{-1}$ accumulated with the SND detector at the $e^{+}{e}^{-}$ collider VEPP-2000 in 2010–2024. The ${\eta }^{\mathrm{\prime }}\to \eta {\pi }^0{\pi }^0$ decay is used in the analysis, with the subsequent $\eta$ and ${\pi }^0$ decays into $\gamma \gamma$. Upper limits not exceeding 13 pb have been set on the $e^{+}{e}^{-}\to {\eta }^{\mathrm{\prime }}\gamma$ cross section at the 90% confidence level.