The Nuclear Magnetic Moments of ${\mathrm{C}}^{13}$, ${\mathrm{Ba}}^{135}$ and ${\mathrm{Ba}}^{137}$

The nuclear gyromagnetic ratios for ${\mathrm{C}}^{13}$, ${\mathrm{Ba}}^{135}$ and ${\mathrm{Ba}}^{137}$ have been measured by the molecular beam magnetic resonance method. The signs of the nuclear magnetic moments have also been determined. For ${\mathrm{C}}^{13}$ the $g$ value is 1.402±0.004 and the moment is positive. When this fact is considered with the results of theoretical treatments of the ${\mathrm{C}}^{13}$ nucleus, $I=\frac{1}{2}$ seems to be the preferable value for ${\mathrm{C}}^{13}$. The resultant nuclear magnetic moment is +0.701±0.002 n. m. The moments for both ${\mathrm{Ba}}^{135}$ and ${\mathrm{Ba}}^{137}$ are positive. The $g$ values are 0.5575±0.0017 and 0.6236±0.0019 respectively. Using $I=\frac{3}{2}$ for both nuclei, the corresponding nuclear magnetic moments are +0.8363±0.0026 and +0.9354±0.0029, respectively. The ratio of the moments is 1.1174±0.0010. All $g$ values are referred to that for ${\mathrm{Li}}^7$ of 2.1688. Careful examination of the barium beam intensity as a function of homogeneous field strength with constant oscillating field frequency revealed only two resonance minima.