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Coherent photoproduction of the neutral-pion and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math> -meson on the deuteron at incident energies below 1.15 GeV
Coherent photoproduction of the neutral-pion and $\ensuremath{\eta}$-meson on the deuteron, $\ensuremath{\gamma}d\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\eta}d$, was experimentally studied at incident photon energies ranging from the reaction threshold to 1.15 GeV. The total cross section demonstrates a rapid rise below 1 GeV. The data are underestimated by the existing theoretical calculations based on quasifree ${\ensuremath{\pi}}^{0}\ensuremath{\eta}$ …