Spin dependence of d5/2 neutron configurations in the wave functions of 92,94Zr from g-factor measurements

g factors of the 2+1 and 4+1 states in 92,94Zr have been measured via Coulomb excitation of isotopically pure 92,94Zr beams in inverse kinematics in combination with the transient field technique. The high precision results, g(92Zr; 2+1) = −0.180(10) and g(94Zr; 2+1) = −0.329(15) as well as the new data on the 4+1 state, g(92Zr; 4+1) = −0.50(11), provide, for the first time, clear evidence of the dominant role of d5/2 neutrons in the wave functions of these nuclei just above the N=50 shell closure. Moreover, the data imply increased purity of the d5/2 neutron component in the wave function with increasing spin.