Measurement of the Quadrupole Moment ofLi8by Use of a Polarized Deuteron Beam and NMR Detection

Abstract

Polarized ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$ nuclei ($T_{\frac{1}{2}}=0.84\mathrm{}$ sec), produced in ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(d, p){}_{}{}^8{}_{}{}^{}\mathrm{Li}$ with polarized deuterons, were implanted in a thick LiI${\mathrm{O}}_3$ crystal used as the target. The asymmetry in the $\beta$ decay of ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$ was used to detect NMR in a strong magnetic field. About $\frac{1}{3}$ of the ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$ nuclei found Li substitutional sites where the polarization persisted for $T_1\approx 11$ sec. The quadrupole moment of ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$ was determined from a knowledge of the electric field gradient in LiI${\mathrm{O}}_3$.