true that the net result of higher shell admixtures is to rob strength from the low energy sector and move it to higher energies. In some cases the total strength gets depleted.

We next compare the low energy sum in the large space with the small space sum. In all cases the latter is larger than the low energy sum, thus indicating that there is a quenching of the low energy part due to higher shell admixtures. The hindrance factor $[(low~large)/small]$ is $0.88$ for the isovector orbital in $^8\mbox{Be}$, $0.73$ for the isovector spin in $^8\mbox{Be}$, $0.77$ for the total $M1$ in $^{10}\mbox{Be}$ etc.

Note that the total $M1$’s for $^{10}\mbox{Be}$ are somewhat larger than for $^8\mbox{Be}$. However there is a dramatic drop in the orbital strength in $^{10}\mbox{Be}$ relative to that in $^8\mbox{Be}$. The large space summed orbital strength for $^8\mbox{Be}$ is $0.73$ $\mu_N^2$ whereas for $^{10}\mbox{Be}$ (to $J=1^+$ $T=1$ and $T=2$) the value is ($0.196~+~0.183$)=$0.38$ $\mu_N^2$. In the low energy sector the $^8\mbox{Be}$ value is $0.59$ $\mu_N^2$ whereas for $^{10}\mbox{Be}$ it is $0.10~+~0.13~=~0.23$ $\mu_N^2$, less than half the value for $^8\mbox{Be}$.

From the systematics of orbital transitions in heavy nuclei one concludes that the proper milieu for isovector 