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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. Speidel^1,2, 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 d_5/2 neutrons in the wavefunction and bear a similarity to ¹⁸O where two neutrons in the d_5/2 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