Measurement of the magnetic dipole moment ofβ-emittingAl25by use of a polarized proton beam and nuclear magnetic resonance detection

Polarized $\beta$-emitting ${}_{}{}^{25}{}_{}{}^{}\mathrm{Al}$ nuclei ($I^{\pi }={\frac{5}{2}}^{+}$, $T_{\frac{1}{2}}=7.2\mathrm{}$ sec) were produced in the reaction ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}{(\overrightarrow{p},\alpha )}^{25}\mathrm{Al}$ in a thick single crystal of Si which served as host for the implanted ${}_{}{}^{25}{}_{}{}^{}\mathrm{Al}$ nuclei. The net polarization transferred to the ${}_{}{}^{25}{}_{}{}^{}\mathrm{Al}$ nuclei was detected by measuring the asymmetry in the $\beta$-decay. The magnetic dipole moment of ${}_{}{}^{25}{}_{}{}^{}\mathrm{Al}$ was measured by nuclear magnetic resonance destruction of the polarization. Including the diamagnetic correction, we obtain $\mu =[3.6455(12\left)\right]{\mu }_N$.