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Q: Fachverband Quantenoptik und Photonik
Q 52: Nuclear Clocks
Q 52.4: Vortrag
Donnerstag, 13. März 2025, 12:00–12:15, HS Botanik
Buffer Gas Stopping Cell for Extraction of 229Th Ions for Nuclear Clock Development — •Srinivasa Pradeep Arasada1, Florian Zacherl1, Keerthan Subramanian1, Jonas Stricker1,2, Valerii Andriushkov2,3, Yumiao Wang1,4, Nutan Kumari Sah1, Ke Zhang1, Ferdinand Schmidt-Kaler1, Dmitry Budker1,2,3,5, Christoph E Düllmann1,2,3, and Lars von der Wense1 — 1Johannes Gutenberg Universität Mainz, Germany — 2Helmholtz Institute Mainz, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 4Fudan University, Shanghai, China — 5Department of Physics, University of California, Berkeley, USA
The isomeric state of 229Th offers a unique opportunity for precision spectroscopy due to its exceptionally low excitation energy, making it most suitable for developing nuclear clocks with unprecedented accuracy. The isomeric state in 229Th can be populated via a 2% decay branch during α decay of 233U. Here we outline our plans for extracting thorium ions from a 233U recoil-ion source using a buffer gas stopping cell. The system utilizes ultra-pure helium gas to minimize substantial losses caused by charge exchange or molecular formation. The extracted Th3+ions are subsequently loaded into a Paul trap via a radio frequency quadrupole (RFQ) guide and Quadrupole Mass Spectrometer(QMS), where they are co-trapped with laser-cooled 40Ca+ ions for spectroscopic interrogation.
This project is supported by the BMBF Quantum Futur II Grant Project ’NuQuant’(FKZ 13N16295A).
Keywords: Nuclear clock; Buffer gas; Thorium ions; α decay; Paul trap