The European Physical Journal A

, Volume 8, Issue 1, pp 31-40

First online:

Measurement of the electric quadrupole moments of 26–29Na

  • M. KeimAffiliated withEP Division, CERN
  • , U. GeorgAffiliated withInstitut für Physik, Universität Mainz
  • , A. KleinAffiliated withInstitut für Physik, Universität Mainz
  • , R. NeugartAffiliated withInstitut für Physik, Universität Mainz
  • , M. NeurothAffiliated withInstitut für Physik, Universität Mainz
  • , S. WilbertAffiliated withInstitut für Physik, Universität Mainz
  • , P. LievensAffiliated withLaboratorium voor Vaste-Stoffysica en Magnetisme, K. U. Leuven
  • , L. VermeerenAffiliated withInstituut voor Kern- en Stralingsfysica, K. U. Leuven
  • , B. A. BrownAffiliated withDepartment of Physics and Astronomy and NSCL, Michigan State University

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The nuclear electric quadrupole moments of the isotopes 26Na, 27Na, 28Na and 29Na were measured by β-NMR spectroscopy in single crystals of LiNbO3 and NaNO3. High degrees of nuclear polarization were produced by optical pumping of the sodium atoms in a fast beam with a collinear laser beam. The polarized nuclei were implanted into the crystals and NMR signals were observed in the β-decay asymmetries. Preparatory measurements also yielded improved values for the magnetic moments of 27–31Na and confirmed the spin I = 3/2 for 31Na. The results are discussed in comparison with large-basis shell model calculations.


21.10.Ky Electromagnetic moments 27.30.+t 20 ≤ A ≤ 38 76.60.-k Nuclear magnetic resonance and relaxation