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HK: Fachverband Hadronen und Kerne

HK 48: Nuclear Structure and Dynamics I

HK 48.8: Vortrag

Mittwoch, 18. März 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 U_ν(6/12) ⊗ U_π(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.