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We report the first observation of the decay D^+ -> eta' e^+ nu_e in twoanalyses, which combined provide a branching fraction of B(D+ -> eta' e nu) =(2.16 +/- 0.53 +/- 0.07) x 10^{-4}. We also provide an improved measurement ofB(D+ -> eta e nu) = (11.4 +/- 0.9 +/- 0.4) x 10^{-4}, provide the first formfactor measurement, and set the improved upper limit B(D+ -> phi e nu) < 0.9 x10^{-4} (90% C.L.).

Studies of D^+ -> {eta', eta, phi} e^+ nu_e