The Nuclear Spin and Magnetic Moment ofLi6

The spin of the ${\mathrm{Li}}^6$ nucleus and the h.f.s. separation of the ${}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}$ normal state have been measured by the atomic beam method of zero moments. The evaluation of the contribution of ${\mathrm{Li}}^7$ to the intensity in the neighborhood of the ${\mathrm{Li}}^6$ zero moment peak was made by an extension of the method of analysis previously used in determining the spin of ${\mathrm{K}}^{41}$ and ${\mathrm{Rb}}^{87}$. The spin of ${\mathrm{Li}}^6$ was found to be 2/2 and the h.f.s. separation 0.0077±0.0001 ${\mathrm{cm}}^{-1\mathrm{}}$ on the basis of the value of Fox and Rabi for ${\mathrm{Li}}^7$. The ratio of the magnetic moments of the isotopes is $\frac{{\mu }_6}{{\mu }_7}=0.258\mathrm{}\pm 0.5$ percent. From the value calculated by Breit and Doerman for ${\mathrm{Li}}^7$, the moment of ${\mathrm{Li}}^6$ is 0.85 nuclear magneton.