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HK: Physik der Hadronen und Kerne
HK 32: Postersitzung / Kernphysik
HK 32.8: Poster
Mittwoch, 24. März 1999, 10:15–12:00, Foyer
Evidence of neutron configurations in the structure of the first 2+ and 4+ states of 92Zr from g-factor measurements+ — •K.-H. Speidel1,2, N. Benzcer-Koller2, J. Holden2, G. Jakob2, G. Kumbartzki2, C. Beausang3, R. Krücken3, and P. Maier-Komor4 — 1Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2Dept. of Physics & Astronomy, Rutgers Univ. NJ, USA — 3WNSL, Yale Univ. New Haven CT, USA — 4Physik-Dept. TU-München, D-85748 Garching
90Zr is a half magic nucleus with the neutron number N=50. The heavier Zr isotopes are likely to exhibit strong neutron single particle characteristics which can be probed best by magnetic moment measurements. In former measurements g-factors were determined for the first 2+ state of 92,94Zr with poor accuracy using the conventional transient field (TF) technique [1]. In the present measurements performed at the tandem accelerator of Yale University Coulomb exitation of 300 MeV 92Zr beams on a Si target was combined in inverse kinematics with the TF technique using Gd as host. The detection of coincident γ-rays was accomplished with very efficient Clover Ge detectors. Preliminary results of g-factors deduced for the 2+ an 4+ states at 935 keV and 1496 keV with mean lives τ=7.2(6) ps and 147(4) ps, respectively, are g(2+)=−0.183(20) and g(4+)=−0.64(26). These new data clearly indicate the dominance of d5/2 neutrons in the wavefunction and bear a similarity to 18O where two neutrons in the d5/2 shell determine the g-factors of the 2+ and 4+ states as well [2].
[1] M. Hass et al., Phys. Rev. C22(1980)1065
[2] P. Raghavan, At. and Nucl. Data Tables 42(1989)189 +supported by the DFG