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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 7: Nuclear Moments

HK 7.3: Talk

Monday, March 16, 1998, 14:30–14:45, E

Measurement of the electric quadrupole moments of 26−31Na — •S. Wilbert1, W. Geithner1, U. Georg1, S. Kappertz1, M. Keim2, P. Lievens3, R. Neugart1, L. Vermeeren3, B.A. Brown4, and ISOLDE Collaboration21Inst. für Physik, Universität Mainz — 2CERN, Geneva — 3Dept. Natuurkunde, K.U. Leuven — 4Michigan State Univ., East Lansing, USA

The neutron-rich sodium isotopes close to the N shell closure exhibit strong deviations from pure sd-configurations which can be understood as deformation effects. We have investigated the quadrupole moments of 26−31Na using β-NMR techniques. The beams of short-lived isotopes obtained from ISOLDE are spin-polarized by optical pumping. The atoms are implanted into single crystals of non-cubic symmetry (LiNbO3, Mg, NaNO3). The interaction between the nuclear quadrupole moment and the internal field gradient of the lattice leads to a 2I-fold splitting of the NMR signal. In the last year the measurements at the N shell closure were completed, and the quadrupole moments were determined for the full series of isotopes, 26−31Na. >From a measurement on 28Na in NaNO3 for which the gradient at the substitutional sodium site is known from classical NMR, a calibration of the field gradients was obtained. These results are discussed in comparison with recent shell-model calculations including fp-shell admixtures. In this context the sign of the quadrupole moments, determined from the relative line intensities, is important.

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