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The first-excited state $g$~factor of $^{26}$Mg has been measured relative tothe $g$ factor of the $^{24}$Mg($2^+_1$) state using the high-velocitytransient-field technique, giving $g=+0.86\pm0.10$. This new measurement is instrong 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 $\nud_{5/2}$ subshell at $N=14$. The possibility that precise $g$-factormeasurements may indicate the onset of neutron $pf$ admixtures in first-excitedstate even-even magnesium isotopes below $^{32}$Mg is discussed and theimportance of precise excited-state $g$-factor measurements on $sd$~shellnuclei with $N\neq Z$ to test shell-model wavefunctions is noted.

Probing the $N = 14$ subshell closure: $g$ factor of the $^{26}$Mg(2$^+_1$) state