On the Nuclear Magnetic Moments of the Boron Isotopes

Abstract

The nuclear Landé $g$ values of ${}_5{}^{}{}_{}{}^{}\mathrm{B}_{}^{10}{}_{}{}^{}$ and ${}_5{}^{}{}_{}{}^{}\mathrm{B}_{}^{11}{}_{}{}^{}$ have been measured by means of the molecular beam magnetic resonance method, with the alkali tetraborates and metaborates. The values which were found are, in units of $\frac{e}{2Mc}$, 0.597±0.003 and 1.788±0.005. The assignment of the observed $g$ values to the appropriate isotopes is discussed with the result that the former is assigned to ${\mathrm{B}}^{10}$ and the latter to ${\mathrm{B}}^{11}$. If one assumes a value of 1 and $\frac{3}{2}$ for the nuclear spins of ${\mathrm{B}}^{10}$ and ${\mathrm{B}}^{11}$, respectively, the magnetic moments are 0.597±0.003 and 2.682±0.008 nuclear magnetons for the ${\mathrm{B}}^{10}$ and ${\mathrm{B}}^{11}$ isotopes, respectively.