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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Structure and Dynamics of Nuclei X
HK 40.4: Vortrag
Donnerstag, 13. März 2025, 15:00–15:15, HS 2 Physik
Coulomb excitation in 185g,mHg — •Hannah Kleis1, Peter Reiter1, Liam Gaffney2, Janne Pakarinen3, and Katarzyna Wrzosek-Lipska4 for the IS699 collaboration — 1IKP, University of Cologne, Germany — 2University of Liverpool, UK — 3University of Jyväskylä, Finland — 4HIL, University of Warsaw, Poland
Shape coexistence in the neutron-deficient lead region around N≈104 has been discovered in different nuclei especially in the mercury isotopes, where a staggering effect was found between even- and odd-mass nuclei using charge radii measurements [1,2]. In addition the study of the even-even 182,184,186,188Hg isotopes showed a mixing of weakly deformed oblate and more deformed prolate configurations which coexists at low excitation energies [3]. To investigate collective behavior of low-lying states on top of the (1/2−) ground-state in 185gHg and the (13/2+) isomeric state in 185mHg, a Coulomb excitation experiment was performed at HIE-ISOLDE. The 185g,mHg beams were accelerated onto 120Sn and 48Ti targets with an energy of 4 MeV/u. The emitted γ rays were detected utilizing the Miniball array in coincident to the scattered particles measured in the DSSSD detector. First results yield the discovery of the signature partner band of the ground-state band which was observed up to spin values of 25/2−. Supported by BMBF Projects 05P21KCI1, 05P24KCI1. This project has received funding from the European Union’s Horizon Research and Innovation programme under Grant Agreement No. 101057511. [1] B. Marsh et al., Nature Physics 14, 1163 (2018) [2] J. Bonn et al., Z Phys A 276(3), 203 (1976) [3] K. Wrzosek-Lipska et al., EPJ A 55:130 (2019)
Keywords: Miniball; HIE-ISOLDE; Mercury; Shape coexistence; Coulomb excitation