The first-excited state g factor of 26 Mg has been measured relative to the g factor of the 24 Mg(2+1 ) state using the high-velocity transient-field technique, giving g = +0.86 ± 0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(2+1 ) and B(E2) systematics, signal the closure of the νd5/2 subshell at N = 14. The possibility that precise g-factor measurements may indicate the onset of neutron p f admixtures in first-excited state even–even magnesium isotopes below 32 Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N = Z to test shell-model wavefunctions is noted.

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