B13Nuclear Magnetic Dipole Moment

Abstract

Polarized ${}_{}{}^{13}{}_{}{}^{}\mathrm{B}$ nuclei have been produced through the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}\mathrm{}(t,p)\mathrm{}{}_{}{}^{13}{}_{}{}^{}\mathrm{B}$ reaction using the 3.5-MeV Van de Graaff accelerator at Brookhaven National Laboratory. The recoiling nuclei were stopped in Au, Pd, and Pt foils, and the effective dipole moments of ${}_{}{}^{13}{}_{}{}^{}\mathrm{B}$ in these metals were measured by a resonant depolarization technique. From earlier measurements of the spin-lattice relaxation times of ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$ in the same metals, the magnetic effects of the stopping foils were estimated. Using a common enhancement factor for the three metals, the ${}_{}{}^{13}{}_{}{}^{}\mathrm{B}$ magnetic dipole moment was found to be $\mu ({}_{}{}^{13}{}_{}{}^{}\mathrm{B}=+3.17712\mathrm{}(51)\mathrm{}{\mu }_N$, the plus sign being inferred from the Schmidt limits for odd-proton spin $\frac{3}{2}$ nuclei.