Abstract

The isoscalar part of the ${\ensuremath{\eta}}^{0}$ photoproduction amplitude near threshold has been determined by differential cross-section measurements of the coherent process $\ensuremath{\gamma}+d\ensuremath{\rightarrow}{\ensuremath{\eta}}^{0}+d$ from near threshold to 150 MeV above threshold. By comparison of the results with earlier measurements of $\ensuremath{\gamma}+p\ensuremath{\rightarrow}{\ensuremath{\eta}}^{0}+p$ and a recent measurement of $\ensuremath{\gamma}+d\ensuremath{\rightarrow}{\ensuremath{\eta}}^{0}+(p, n)$ it is possible to argue that the isovector part of the ${\ensuremath{\eta}}^{0}$ photoproduction amplitude near threshold is much smaller than the isoscalar part and is consistent with zero.

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