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Background: Mixed-symmetry 2+ states in vibrational nuclei are characterizedby a sign change between dominant proton and neutron valence-shell componentswith respect to the fully symmetric 2+ state. The sign can be measured by adecomposition of proton and neutron transition radii with a combination ofinelastic electron and hadron scattering [C. Walz et al., Phys. Rev. Lett. 106,062501 (2011)]. For the case of 92Zr, a difference could be experimentallyestablished for the neutron components, while about equal proton transitionradii were indicated by the data. Method: Differential cross sections for theexcitation of one-phonon 2+ and 3- states in 92Zr have been measured with the(e,e') reaction at the S-DALINAC in a momentum transfer range q = 0.3-0.6fm^(-1). Results: Transition strengths B(E2;2+_1 -> 0+_1) = 6.18(23), B(E2;2+_2 -> 0+_1) = 3.31(10) and B(E3; 3-_1 -> 0+_1) = 18.4(11) Weisskopf units aredetermined from a comparison of the experimental cross sections toquasiparticle-phonon model (QPM) calculations. It is shown that amodel-independent plane wave Born approximation (PWBA) analysis can fix theratio of B(E2) transition strengths to the 2+_(1,2) states with a precision ofabout 1%. The method furthermore allows to extract their proton transitionradii difference. With the present data -0.12(51) fm is obtained. Conclusions:Electron scattering at low momentum transfers can provide information ontransition radii differences of one-phonon 2+ states even in heavy nuclei.Proton transition radii for the 2+_(1,2) states in 92Zr are found to beidentical within uncertainties. The g.s. transition probability for themixed-symmetry state can be determined with high precision limited only by theavailable experimental information on the B(E2; 2+_1 -> 0+_1) value.

E2 strengths and transition radii difference of one-phonon 2+ states of 92Zr from electron scattering at low momentum transfer