Puzzle of B(E2) strengths of the symmetric and mixed-symmetry 2+ states in 94Zr

Recently, E. Elhami et al. (2008) reported on a study of the low-spin structure of 94Zr with the (n,n',γ) reaction. The author claimed observation of an anomalous situation where the E2 excitation strength of the mixed-symmetry 2+2 exceeds the strength of the symmetric 2+1 state. Those excitations of 94Zr have been investigated with electron scattering at the S-DALINAC and a model-independent analysis of our (e,e') data has been performed. The extracted ratio of the E2 strengths, B(E2,0+1 → 2+ms)/B(E2,0+1 → 2+1) is less than the unity, which contradicts the (n,n',γ) results. The data analysis and the results are presented. The same analysis has been applied to a set of electron scattering data on 94Mo. The ratio of the of B(E2) strengths of the symmetric and mixed-symmetry 2+ states in 94Mo and their transition radius difference have been extracted for the first time.