Transient-field g-factor measurements in inverse kinematics were performed for the first-excited states of the stable, even isotopes of Ge and Se. The g factors of 74Ge and 74Se were measured simultaneously using a cocktail beam, which eliminates most possible sources of systematic error in a relative g-factor measurement. The results are g(74Se)/g(74Ge)=1.34(7), g(70Ge)/g(74Ge)=1.16(15), g(72Ge)/g(74Ge)=0.92(13), g(76Ge)/g(74Ge)=0.88(5), g(76Se)/g(74Se)=0.96(7), g(78Se)/g(74Se)=0.82(5), g(80Se)/g(74Se)=0.99(7), and g(82Se)/g(74Se)=1.19(6). The measured g-factor ratios are in agreement with ratios from previous measurements, despite considerable variation in previous reported absolute values. The absolute values of the g factors remain uncertain, however, the Rutgers parametrization was used to set the transient-field strength and then compare the experimental g factors with shell-model calculations based on the JUN45 and jj44b interactions. Modest agreement was found between experiment and theory for both interactions. The shell-model calculations indicate that the g(2+1) values and trends are determined largely by the balance of the spin carried by orbital motion of the protons.

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