Nuclear ground-state spin and magnetic moment of 21Mg

J. Krämer, K. Blaum, M. De Rydt, K. T. Flanagan, Ch Geppert, M. Kowalska, P. Lievens, R. Neugart, G. Neyens, W. Nörtershäuser, H. H. Stroke, P. Vingerhoets, D. T. Yordanov

    Research output: Contribution to journalArticlepeer-review


    We present the results of combined laser spectroscopy and nuclear magnetic resonance studies of 21Mg. The nuclear ground-state spin was measured to be I = 5 / 2 with a magnetic moment of μ = - 0.983 (7) μN. The isoscalar magnetic moment of the mirror pair (21F, 21Mg) is evaluated and compared to the extreme single-particle prediction and to nuclear shell-model calculations. We determine an isoscalar spin expectation value of 〈 σ 〉 = 1.15 (2), which is significantly greater than the empirical limit of unity given by the Schmidt values of the magnetic moments. Shell-model calculations taking into account isospin non-conserving effects, are in agreement with our experimental results.

    Original languageEnglish (US)
    Pages (from-to)465-469
    Number of pages5
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number5
    StatePublished - Aug 3 2009


    • Hyperfine structure
    • Laser spectroscopy
    • NMR
    • Nuclear magnetic moment

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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