Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Physik mit schweren Ionen III / Kernphysik
HK 12.9: Vortrag
Montag, 20. März 2000, 18:45–19:00, B 98
Measurements of Magnetic Moments of 78−86Kr Isotopes + — •K.-H. Speidel1, N. Benczer-Koller2, T. Mertzimekis2, G. Kumbartzki2, J. Holden2, G. Jakob2, P. Maier-Komor3, W. Korten4, A. Pakou5, I.Y. Lee6, A. Macchiavelli6, M. McMahan6, L. Phair6, S. Vincent7 und A. Aprahamina7 — 1Inst. für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2Dept. of Physics & Astronomy, Rutgers Univ., NJ, USA — 3Physik-Dept. TU-München, D-85748 Garching — 4CEA-Saclay, F-91191 Gif-sur-Yvette — 5Dept. of Physics, Univ. of Ioannina, 45110 Ioannina, Greece — 6LBL, CA, USA — 7Phys. Dept., Univ. of Notre Dame, IN, USA
The g factors of the first 2+ states of even-even Kr isotopes have been measured for the first time. For 78,80Kr also g(4+) values were obtained. The structure of Kr is similar to neighbouring Se. Shell closure effects as well as coexisting shapes are the dominant features. Kr beams of 220MeV and 250MeV were provided by the 88" cyclotron of LBL. The nuclear states were Coulomb excited in inverse kinematics with a 26Mg target. The γ rays were detected in coincidence with the forward recoiling Mg ions in Ge or NaI(Tl) detectors. A Si solar cell served as particle detector. Whereas the g factor of 86Kr(2+) is large reflecting proton configurations at N=50 shell closure, the lighter isotopes show smaller values with a definite rise towards the lighter isotopes. This behaviour can be attributed to an increase of collectivity (g=Z/A), however, the larger value of the 78Kr(4+) state is indicative of single particle contributions. + supported by DFG and BMBF