r=r0A13,r=r_0A^{\frac 13},r=r0A31,
rCurAl=(ACuAAl)13=(6427)13=43,\frac{r_{Cu}}{r_{Al}}=(\frac{{A_{Cu}}}{A_{Al}} )^{\frac 13}=(\frac{64}{27})^{\frac 13}=\frac 43,rAlrCu=(AAlACu)31=(2764)31=34,
rCu=43⋅3.6=4.8 fm.r_{Cu}=\frac 43\cdot 3.6=4.8~\text{fm}.rCu=34⋅3.6=4.8 fm.
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