Spin dependence of d(5/2) neutron configurations in the wave functions of Zr-92,Zr-94 from g-factor measurements

g factors of the 2(1)(+) and 4(1)(+) states in Zr-92,Zr-94 have been measur ed via Coulomb excitation of isotopically pure Zr-92,Zr-94 beams in inverse kinematics in combination with the transient field technique. The high pre cision results, g(Zr-92; 2(1)(+)) = -0.180(10) and g(Zr-94; 2(1)(+)) = -0.3 29(15) as well as the new data on the 4(1)(+) state, g(Zr-92; 4(1)(+)) = -0 .50(11), provide, for the first time, clear evidence of the dominant role o f d(5/2) neutrons in the wave functions of these nuclei just above the N = 50 shell closure. Moreover, the data imply increased purity of the d(5/2) n eutron component in the wave function with increasing spin. (C) 1999 Publis hed by Elsevier Science B.V. All rights reserved.