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Transient-field $g$-factor measurements in inverse kinematics were performedfor the first-excited states of the stable, even isotopes of Ge and Se. The $g$factors of $^{74}$Ge and $^{74}$Se were measured simultaneously using acocktail beam, which eliminates most possible sources of systematic error in arelative $g$-factor measurement. The results are $g(^{74}{\rm Se})/g(^{74}{\rmGe})=1.34(7)$, $g(^{70}{\rm Ge})/g(^{74}{\rm Ge}) = 1.16(15)$, $g(^{72}{\rmGe})/g(^{74}{\rm Ge})=0.92(13)$, $g(^{76}{\rm Ge})/g(^{74}{\rm Ge})=0.88(5)$,$g(^{76}{\rm Se})/g(^{74}{\rm Se})=0.96(7)$, $g(^{78}{\rm Se})/g(^{74}{\rmSe})=0.82(5)$, $g(^{80}{\rm Se})/g(^{74}{\rm Se})=0.99(7)$ and $g(^{82}{\rmSe})/g(^{74}{\rm Se})=1.19(6)$. The measured $g$-factor ratios are in agreementwith ratios from previous measurements, despite considerable variation inprevious reported absolute values. The absolute values of the $g$ factorsremain uncertain, however the Rutgers parametrization was used to set thetransient-field strength and then compare the experimental $g$ factors withshell-model calculations based on the JUN45 and jj44b interactions. Modestagreement was found between experiment and theory for both interactions. Theshell model calculations indicate that the $g(2^+_1)$ values and trends aredetermined largely by the balance of the spin carried by orbital motion of theprotons.

First-excited state $g$ factors in the stable, even Ge and Se isotopes