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HK: Fachverband Hadronen und Kerne

HK 15: Nuclear Structure and Dynamics I

HK 15.2: Vortrag

Montag, 16. März 2009, 16:45–17:00, H-ZO 40

Study of collectivity in ⁶²Zn — •Michael Albers, Dennis Mücher, Jan Jolie, Christoph Fransen, Andrey Blazhev, Pavel Petkov, Désirée Radeck, and Christian Bernards — Institut für Kernphysik, Universität zu Köln

The experimental proof for the existence of proton-neutron mixed symmetry states has been shown in several, mostly stable nuclei in the 50<A<150 mass region in the last years by analysing M1 transitions to fully symmetric states, which are the main experimental signatures for the existence of these states. Since information about mixed symmetry states in unstable nuclei is very sparse, experiments have been performed at the Tandem accelerator of the Institut für Kernphysik in Cologne to identify the first mixed symmetry state 2_ms,1⁺ in several unstable N=48,52 isotones, but absolute transition strengths could not be obtained until now. An additional experiment was performed at the IKP in Cologne using the ⁶¹Ni(³He,2n γ)⁶²Zn reaction to identify the first mixed symmetry state in ⁶²Zn. Utilizing the high efficiency HORUS cube spectrometer, which allows the analysis of γ γ angular correlations and the determination of lifetimes via the DSA Method, absolute transition strengths in ⁶²Zn could be obtained, by which a fragmentation of the mixed symmetry state 2_ms,1⁺ turned out to be the case.

The results have been complemented to the systematical trends in the Z=30 Zinc isotopes and a predicted loss of collectivity in the lighter Zn isotopes up to ⁵⁸Zn could be verified.

Supported by DFG under grant JO397 3-2