Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Structure and Dynamics of Nuclei VII
HK 37.2: Talk
Wednesday, April 1, 2020, 17:00–17:15, J-HS E
Nuclear Isovector Valence-shell Excitation of 202,204Hg — •Ralph Kern1, Robert Stegmann1, Norbert Pietralla1, Georgi Rainovski2, Mike P. Carpenter3, Robert V. F. Janssens4,5, Marc Lettmann1, Oliver Möller1, Thomas Möller1, Christian Stahl1, Volker Werner1, and Shaofei Zhu3 — 1Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany — 2Faculty of Physics, University of Sofia St. Kliment Ohridski, Sofia, Bulgaria — 3Physics Division, ANL, Argonne, IL, USA — 4Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA — 5Triangle Universities Nuclear Laboratory, Duke University, Dunham, NC, USA
In the framework of the IBM-2, a class of excited states is predicted, where the collective valence-neutron and proton motions are out of phase. These so-called mixed-symmetry states (MSS) represent a rare physics case in which the interplay between nuclear collectivity, shell structure, and isospin degrees of freedom can be studied. MSS were observed in nuclei near shell closures in the A = 90, 130 mass regions, and recently near the doubly-magic 208Pb [1]. To extend the knowledge about this data in the A = 208 mass region, projectile Coulomb excitation experiments with stable Hg ion beams were performed at the ATLAS facility at Argonne National Laboratory [2,3].
Supported by the BMBF under Grant No. 05P18RDCIA.
[1] D. Kocheva et al., Phys. Rev. C 93, 011303(R) (2016).
[2] R. Stegmann et al., Phys. Lett. B 770, 77 (2017).
[3] R. Kern et al., Phys. Rev. C 99, 011303(R) (2019).