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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.37: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Setup of a laser system for Th ions cooling and spectroscopy in a Paul Trap — •Yumiao Wang^1,2, Valerii Andriushkov^3,4, Keerthan Subramanian¹, Ke Zhang¹, Florian Zacherl¹, Nutan Kumari Sah¹, Jonas Stricker^1,3, Srinivasa Pradeep Arasada¹, Christoph E. Düllmann^1,3,4, Dmitry Budker^1,3,4,5, Ferdinand Schmidt-Kaler¹, and Lars von der Wense¹ — ¹University of Mainz, Germany — ²Fudan University, China — ³Helmholtz Institute Mainz, Germany — ⁴GSI Helmholtz Centre for Heavy Ion Research, Germany — ⁵University of California, USA

The ^229mTh isomeric state, with its low excitation energy, offers the potential for highly precise nuclear optical clocks, aiding in dark matter detection and measuring physical constants. Recent experiments have shown direct excitation and de-excitation of the ^229mTh nuclear transition in Th-doped crystals using VUV lasers and frequency combs, though excitation in a Paul trap has not yet been achieved. We aim to excite the nuclear transition in ²²⁹Th³⁺ ions, sympathetically cooled with Ca+ in a Paul trap, and detect it via a double-resonance scheme, where nuclear spin changes affect electronic levels through hyperfine interaction. Progress towards setting up the Paul trap and laser systems to probe the Th³⁺ electronic shell, along with future precision measurement possibilities for the octupole moment of the ground and isomeric states, will be presented.

This work is supported by the DFG Project ’TACTICa’ (grant no. 495729045) and the BMBF Quantum Futur II Grant Project ’NuQuant’ (FKZ 13N16295A).

Keywords: Th-229; Nuclear Clock; Paul Trap; Sympathetic Cooling; Hyperfine Spectroscopy