The gyromagnetic ratio of ${\mathrm{He}}^3$ was compared to that of ${\mathrm{H}}_2$ gas by the magnetic resonance method with the result $\frac{\left|\gamma \right({\mathrm{He}}^3\left)\right|}{\left|\gamma \right({\mathrm{H}}_2\left)\right|}=0.7617866\mathrm{}\pm 0.0000012$

To obtain the nuclear gyromagnetic ratios, a diamagnetic correction must be made which raises this by approximately 38 parts in ${10}^6$ to $\frac{\left|\gamma {\mathrm{He}}^3\right|}{\left|{\gamma }_p\right|}=0.761815\mathrm{}$

Intensity measurements were consistent with a spin of ½. In nuclear magnetons, the magnetic moment $\mu {\mathrm{He}}^3=(-)2.12815$ based on the value ${\mu }_p=2.79353\mathrm{}$ obtained by Taub and Kusch. The negative sign has not yet been verified.

• Received 18 July 1949

DOI:https://doi.org/10.1103/PhysRev.76.1460