Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei IX

HK 60.7: Talk

Friday, March 31, 2017, 15:45–16:00, F 2

Identification of the Mixed-Symmetry One-Phonon-2_1,ms⁺-State of ²⁰²Hg — •Ralph Kern¹, Robert Stegmann¹, Thomas Möller¹, Norbert Pietralla¹, Georgi Rainovski², Christian Stahl¹, Marc Lettmann¹, Robert Janssens³, Mike Carpenter³, and Shaofei Zhu³ — ¹Institut für Kernphysik, TU Darmstadt — ²Faculty of Physics, St. Kliment Ohridski University Sofia, Bulgarien — ³Argonne National Laboratory, Argonne, IL, USA

The IBM-2 predicts excited nuclear states of anti-symmetric proton-neutron character, so-called mixed-symmetry states (MSS). MSS probe the effective proton-neutron interaction and are suitable to study the two-fluid properties of atomic nuclei. The 2_1,ms⁺-state can be identified by its large absolute ⟨2_1,ms⁺||M1||2₁⁺⟩≈1µ_N. Recently low-lying one-phonon 2_1,ms⁺-states have been identified for the first time in ²⁰⁴Hg and ²¹²Po, which exhibit a valence alpha (hole) particle structure with respect to the double magic ²⁰⁸Pb. ²⁰²Hg has 4 valence neutron-holes and 2 valence proton-holes, which leads to a similar boson structure like in ²⁰⁴Hg. Therefore a projectile Coulomb-excitation experiment was performed at the Argonne National Laboratory in order to identify the 2_1,ms⁺-state of ²⁰²Hg. The emitted gamma-rays were detected by the Gammasphere spectrometer. First results will be presented. Supported by DFG Pi 393/2-3 and BMBF 05P12RDCIB and 05P15RDCIA.