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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Struktur und Dynamik von Kernen II

HK 9.7: Vortrag

Montag, 21. März 2011, 18:15–18:30, O-1

β-delayed γ-ray spectroscopy of 196Hg — •C. Bernards^1,2, M. Elvers^1,2, D. Radeck^1,2, J. Jolie¹, T. Thomas¹, K.O. Zell¹, T. Ahn², A. Heinz², G. Ilie², D. Savran², V. Werner², T. Ahmed³, C. Deng³, E. Jiang³, R. Lee³, and N. Shenkov³ — ¹IKP, University of Cologne, Germany — ²WNSL, Yale University, USA — ³University of Richmond, USA

Recent experimental results on the nucleus 196Hg – especially newly determined level spins and multipole mixing ratios of γ-transitions between low-energy states – show a good agreement with supersymmetrical predictions, describing 196Hg as the two-fermion, five-boson member of the supermultiplet around 194Pt. To complete the data of a previous 194Pt(α, 2n) experiment and to search for further low-lying low-spin states that might not be populated by that reaction, we chose to perform a new experiment on 196Hg. This time we approach 196Hg via β-decay. We used a 35 MeV proton beam at the Wright Nuclear Structure Laboratory to induce the reaction 198Hg(p, 3n)196Tl. Our target consisted of highly enriched 198Hgs. One β-decay branch populates preferably the low-spin states we are interested in. The 196Hg γ-transitions were detected with the highly efficient YRAST Ball γ-spectrometer. We present results of the experiment and discuss the description of the even-even mercury isotopes in the context of the nuclear structure supersymmetry. Supported by DFG grants Jo391/2-3, Jo391/3-2, and by U.S. DOE grant DE-FG02-91ER40609.