Nuclear moments of Li9

F. D. Correll, L. Madansky, R. A. Hardekopf, and J. W. Sunier
Phys. Rev. C 28, 862 – Published 1 August 1983
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Abstract

The ground-state magnetic dipole and electric quadrupole moments of the β emitter Li9 (Jπ=32, T12=0.176 s) have been measured for the first time. Polarized Li9 nuclei were produced in the Li7(t, p) reaction, using 5-6 MeV polarized tritons. The recoiling Li9 nuclei were stopped either in Au foils or in LiNbO3 single crystals, and their polarization was detected by measuring the β-decay asymmetry. Nuclear magnetic resonance techniques were used to depolarize the nuclei, and the resonant frequencies were deduced from changes in the asymmetry. The Li9 dipole moment was deduced from the measured Larmor frequency in Au; the result, including corrections for diamagnetic shielding and the Knight shift, is |μ|=3.4391(6) μN. The ratio of the Li9 quadrupole moment to that of Li7 was derived from their respective quadrupole couplings in LiNbO3; the value is |Q(Li9)Q(Li7)|=0.88±0.18. Both results are in agreement with shell model predictions.

RADIOACTIVITY Polarized Li9 from Li7(t, p); measured β asymmetry, polarization transfer, NMR; deduced Li9 magnetic moment |μ|, ratio Li9 to Li7 quadrupole moments |Q(Li9)Q(Li7)|. Comparison with shell-model values.

  • Received 17 March 1983

DOI:https://doi.org/10.1103/PhysRevC.28.862

©1983 American Physical Society

Authors & Affiliations

F. D. Correll* and L. Madansky

  • Department of Physics, The Johns Hopkins University, Baltimore, Maryland 21218

R. A. Hardekopf and J. W. Sunier

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

  • *Present address: Physics Department, United States Naval Academy, Annapolis, MD 21402.

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Vol. 28, Iss. 2 — August 1983

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