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HK: Fachverband Hadronen und Kerne
HK 48: Nuclear Structure and Dynamics I
HK 48.8: Talk
Wednesday, March 18, 2009, 15:45–16:00, H-ZO 40
The even-even nucleus 196Hg and its relation to the “magical quartet" around 194Pt — •Christian Bernards, Michael Albers, Christoph Fransen, Stefan Heinze, Jan Jolie, Désirée Radeck, and Tim Thomas — Institute for Nuclear Physics, University of Cologne
The investigation of 196Hg – especially the determination of level spins and multipole mixing ratios of γ transitions between low-energy states – is of great interest for testing the existence of a relation between the nucleus 196Hg and the so-called “magical quartet" around 194Pt. Within the Uν(6/12) ⊗ Uπ(6/4) extended supersymmetry, this quartet is supposed to be the supermultiplet being described the best. Similar to the quartet members 194,195Pt and 195,196Au, the nucleus 196Hg can be described theoretically by seven IBA-2 particles to the shell closure, in particular by two j = 3/2 proton fermions and five sd neutron bosons as a two-fermions – five-bosons supermultiplet member.
In order to obtain experimental data on 196Hg a γγ angular correlation experiment was performed at the Tandem accelerator of the Institute for Nuclear Physics in Cologne. Using a 4He beam with an energy of 28 MeV impinging a 194Pt target the reaction 194Pt(α, 2n)196Hg was induced. To analyze the γ decays of yrast and non-yrast 196Hg states 13 high purity germanium detectors were mounted in the Horus cube γ-ray spectrometer, which allows the determination of level spins and multipole mixing ratios by the analysis of γγ angular correlations. We will discuss first results of the experiment.