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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 7: Nuclear Moments

HK 7.1: Vortrag

Montag, 16. März 1998, 14:00–14:15, E

Measurement of the magnetic moment of 11Be — •S. Kappertz1, M. Keim2, S. Wilbert2, W. Geithner1, R. Neugart1, P. Lievens3, L. Vermeeren3, and ISOLDE Collaboration21Inst. für Physik, Univ. Mainz — 2CERN, Geneva — 3Dept. Natuurkunde, K.U. Leuven

Neutron halo nuclei such as 11Li and 11Be have been investigated mainly in intermediate-energy heavy-ion reactions. We report on a measurement of the magnetic moment of the 1/2+ ground state of 11Be. Actual theoretic models result in a magnetic moment depending on the admixture of the |10Be(2+)× d5/2;1/2+ ⟩ configuration to the (ν1s1/2) halo orbit. We have investigated the magnetic moment of 11Be using the β-NMR technique on 11Be nuclei implanted in a beryllium single crystal. For preparation, we measured the isotope shift and hyperfine structure splitting of 7,10Be using collinear laser spectroscopy. The Be isotopes are obtained at ISOLDE from proton-induced fragmentation reactions in a UC2 target which is connected to a two-step laser ionization source. The 11Be+ ion beam is spin-polarized by optical pumping. The ions are implanted into a Be single crystal placed in a static magnetic field of ∼ 0.3 T. Nuclear magnetic resonance destroys the polarization which is detected via the asymmetry of the β-radiation. The relative long half-life of 13.8 s requires cooling to about 50 K in order to preserve the nuclear spin polarization in the crystal lattice. A calibration of the NMR-field is obtained from a reference measurement on 8Li. The results are discussed in comparison with recent shell-model calculations.

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