Bohr-Weisskopf effect

Influence of the distributed nuclear magnetization on hfs

H. H. Stroke, H. T. Duong, J. Pinard

    Research output: Contribution to journalArticle

    Abstract

    Nuclear magnetic moments provide a sensitive test of nuclear wave functions, in particular those of neutrons, which are not readily obtainable from other nuclear data. These are taking added importance by recent proposals to study parity non-conservation (PNC) effects in alkali atoms in isotopic series. By taking ratios of the PNC effects in pairs of isotopes, uncertainties in the atomic wave functions are largely cancelled out at the cost of knowledge of the change in the neutron wave function. The Bohr-Weisskopf effect (B-W) in the hyperfine structure interaction of atoms measures the influence of the spatial distribution of the nuclear magnetization, and thereby provides an additional constraint on the determination of the neutron wave function. The added great importance of B-W in the determination of QED effects from the hfs in hydrogen-like ions of heavy elements, as measured recently at GSI, is noted. The B-W experiments require precision measurements of the hfs interactions and, independently, of the nuclear magnetic moments. A novel atomic beam magnetic resonance (ABMR) method, combining rf and laser excitation, has been developed for a systematic study and initially applied to stable isotopes. Difficulties in adapting the experiment to the ISOLDE radioactive ion beam, which have now been surmounted, are discussed. A first radioactive beam measurement for this study, the precision hfs of 126Cs, has been obtained recently. The result is 3629.515(∼0.001) MHz. The ability of ABMR to determine with high precision nuclear magnetic moments in free atoms is a desideratum for the extraction of QED effects from the hfs of the hydrogen-like ions. We also point out manifestations of B-W in condensed matter and atomic physics.

    Original languageEnglish (US)
    Pages (from-to)319-335
    Number of pages17
    JournalHyperfine Interactions
    Volume129
    Issue number1-4
    DOIs
    StatePublished - 2000

    Fingerprint

    Wave functions
    Magnetization
    Magnetic moments
    Atomic beams
    magnetization
    Neutrons
    Magnetic resonance
    Isotopes
    Atoms
    Hydrogen
    Condensed matter physics
    Atomic physics
    wave functions
    Heavy Ions
    Laser excitation
    magnetic moments
    Ions
    atomic beams
    Alkalies
    hydrogen ions

    Keywords

    • Bohr-Weisskopf effect
    • Hyperfine structure
    • Knight shift
    • Nuclear magnetic moments
    • Parity nonconservation in atomic interactions
    • QED

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Atomic and Molecular Physics, and Optics
    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials
    • Nuclear and High Energy Physics

    Cite this

    Bohr-Weisskopf effect : Influence of the distributed nuclear magnetization on hfs. / Stroke, H. H.; Duong, H. T.; Pinard, J.

    In: Hyperfine Interactions, Vol. 129, No. 1-4, 2000, p. 319-335.

    Research output: Contribution to journalArticle

    Stroke, H. H. ; Duong, H. T. ; Pinard, J. / Bohr-Weisskopf effect : Influence of the distributed nuclear magnetization on hfs. In: Hyperfine Interactions. 2000 ; Vol. 129, No. 1-4. pp. 319-335.
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