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We report the first measurements of the branching fractions: $B(\psi(2S) ->\gamma \eta') = (1.54 \pm 0.31 \pm 0.23) x 10^{-4}$ and $B(\psi(2S) -> \gamma\eta) = (0.53 \pm 0.31 \pm 0.08) x 10^{-4}$. The $\psi(2S)$ to $\gamma \eta'$result is consistent with expectations of a model that considers thepossibility of $\eta' - \eta$ mixing. The ratio of the $\psi(2S)$ to $\gamma\eta'$ and $\psi(2S)$ to $\gamma \eta$ rates is used to determine thepseudoscalar octet-singlet mixing angle.Comment: 10 pages with 3 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Branching fractions for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ψ</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mi>S</mml:mi><mml:mo>)</mml:mo><mml:mn /><mml:mo>→</mml:mo><mml:mi>γ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>η</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and γη

Branching fractions forψ(2S)→γη′and γη