Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 30: Nuclear Physics / Spectroscopy IV

HK 30.3: Vortrag

Mittwoch, 13. März 2002, 14:45–15:00, B

Evidence for proton excitations in ^130−136Xe isotopes from measurements of g factors of first excited 2⁺ and 4⁺ states⁺ — •K.-H. Speidel¹, R. Ernst¹, G. Jakob², N. Benczer-Koller², G. Kumbartzki², J. Holden², T.J. Mertzimekis², A.E. Stuchbery³, A. Pakou⁴, P. Maier-Komor⁵, A. Macchiavelli⁶, M. McMahan⁶, L. Phair⁶, and I.Y. Lee⁶ — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — ²Dept. of Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903, USA — ³Dept. of Nuclear Physics, Australian National Univ., Canberra ACT 0200, Australia — ⁴Dept. of Physics, Univ. of Joannina, Greece — ⁵Technische Univ. München, D-86748 Garching — ⁶Lawrence Berkeley National Lab., Berkeley, CA 94720, USA

The g factors of the 2₁⁺, 4₁⁺ and 2₂⁺ states in the stable ^130−136Xe isotopes have been measured via projectile Coulomb excitation in inverse kinematics in combination with the transient field technique. Isotopically pure Xe beams were provided by the 88-inch LBL cyclotron. The results show a steady decrease in g(2₁⁺) as the number of neutron holes increases in the lighter nuclei below the closed N=82 neutron shell. The g factors of the 4₁⁺ states in ^132,134Xe are consistently larger than the g factors of the 2₁⁺ states, a characteristic of proton excitation. In contrast, the g factors of the 2₁⁺, 4₁⁺ and 2₂⁺ states in ¹³⁰Xe are approximately equal as would be expected for a vibrational nucleus.

+ supported by BMBF and DFG