On the Nuclear Magnetic Moments of Several Stable Isotopes

The nuclear induction spectrometer which has previously been described was used to measure the magnetic moments of a number of nuclei. These values are without corrections of any kind and are based upon a value for the magnetic moment of the proton of (2.79348±0.00034) nuclear magnetons. The experience gained from the observation of a large variety of nuclei has made it possible to discuss in a general way the selection of a suitable sample compound. Various interesting phenomena which have turned up in the course of these measurements are discussed; some of these are the following. (a) Nuclear resonance frequencies have been found to depend upon the compound used for the sample in some cases. This has been noted for the isotopes of Cl and N, and for Co, the latter having resonances over a region as large as 1.3 percent. This effect has been demonstrated to be of molecular rather than nuclear origin, and it is responsible for our listing the chemical compounds used for each measurement. (b) The magnetic moments of both ${\mathrm{In}}^{113}$ and ${\mathrm{In}}^{115}$ have been found to be 0.64 percent greater than their respective atomic beam values, a discrepancy very similar to that noted for ${\mathrm{Ga}}^{69}$ and ${\mathrm{Ga}}^{71}$. (c) An hfs anomaly for the isotopes of chlorine has been observed, which is notable, because the atomic beam experiments deal with the ${\mathrm{P}}_{3/2}$ state of atomic chlorine. (d) An unusual structure for the ${\mathrm{Sb}}^{121}$ and ${\mathrm{Sb}}^{123}$ resonances in aqueous solution of NaSb${\mathrm{F}}_6$ has been observed and is qualitatively explained.