探测$N = 14$亚壳层闭合：$^{26}$ Mg（2 $^+_1$）状态的PDMATHAAB因子
Probing the $N = 14$ subshell closure: $g$ factor of the $^{26}$Mg(2$^+_1$) state
摘要：
用高速瞬态场技术测量了$^{26}$ Mg的第一激发态$g$ ~-因子与$^{24}$ Mg（$2^+_1$）态的$g$因子的关系，给出了$g=+0.86\pm0.10$ .这种新的测量与目前采用的值有很大的不同，但与使用USDB相互作用的$sd$ -壳模型一致。新测量的$g$因子，连同$E(2^+_1)$和$B(E2)$系统学，标志着$N=14$处的$νd_{5/2}$亚壳的闭合。精确的$g$ -因子测量可能表明中子$pf$掺合物在低于$^{32}$ Mg的第一激发态偶-偶镁同位素中的开始的可能性进行了讨论，并指出了用$N\neq Z$对$sd$ ~壳核进行精确的激发态$g$ -因子测量以检验壳模型波函数的重要性。
英文摘要：
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 $g=+0.86\pm0.10$. 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 $νd_{5/2}$ subshell at $N=14$. The possibility that precise $g$-factor measurements may indicate the onset of neutron $pf$ 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 $N\neq Z$ to test shell-model wavefunctions is noted.
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