Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
A 14.17: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Development of a cryogenic XUV-comb spectroscopy setup for the 229Th nuclear isomer — •anant agarwal1, lennart guth1, tobias heldt1, florian zacherl2, thorsten schumm3, lars von der wense2, thomas pfeifer1, and josé r. crespo lópez-urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Johannes Gutenberg University Mainz, Germany — 3Vienna University of Technology, Austria
The laser-accessible (148 nm) nuclear transition in 229Th offers intriguing pathways for fundamental physics research and development of novel frequency standards. We aim to investigate the temperature dependence of the transition frequency and variations in the decay time at cryogenic temperatures. In this work, we describe a setup designed to excite the nuclei of Th4+ ions embedded in a Th:CaF2 crystal cooled in a helium cryogenic environment, using an extreme-ultraviolet (XUV) frequency comb. The XUV comb is generated as the 7th harmonic of a near-infrared frequency comb through intra-cavity high harmonic generation.
Keywords: Thorium; Frequency comb spectroscopy; Cryogenic; XUV; Nuclear clock