Nuclear Moment ofNi61

A re-examination of the electron spin resonance spectra of nickel in MgO and nickel in germanium is made. It is proposed that the previously estimated value of 0.3 nm for the nuclear moment of ${\mathrm{Ni}}^{61}$ is in error by a factor of three, and that the value of 0.9 nm is more consistent with the published spectra. The internal fields in nickel and nickel alloys are discussed on the basis of this new moment.