Magnetic Moment of the Proton in H2 O in Bohr Magnetons

We have measured the ratio of the magnetic moment of the electron in hydrogen to the magnetic moment of the proton in ${\mathrm{H}}_{2}$O to be $\frac{{g}_{j}(\mathrm{H})}{{{g}_{p}}^{\ensuremath{'}}}=658.2160091(68)$ [10 parts per billion (ppb)], at a temperature of 34.7\ifmmode^\circ\else\textdegree\fi{}C. This yields a value for the proton moment in Bohr magnetons of $\frac{{{\ensuremath{\mu}}_{p}}^{\ensuremath{'}}}{{\ensuremath{\mu}}_{\mathrm{B}}}=0.001520992983(17)$ (11 ppb). Our result differs from the currently accepted value by 150 ppb.