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MS: Fachverband Massenspektrometrie

MS 3: Studies of Nuclear Metastable States

MS 3.5: Vortrag

Dienstag, 15. März 2022, 11:50–12:05, MS-H9

A cryogenic Paul trap setup for the determination of the ionic radiative lifetime of ^229mTh³⁺ — •Daniel Moritz¹, K. Scharl¹, B. Seiferle¹, F. Zacherl¹, T. Dickel^2,3, F. Greiner^2,3, W. Plass^2,3, L. von der Wense^1,4, T. Leopold^5,6, P. Micke^5,7, J. Crespo López-Urrutia⁵, P.O. Schmidt⁶, and P.G. Thirolf¹ — ¹Ludwig Maximilians Universität München — ²Justus Liebig Universität Gießen — ³GSI Darmstadt — ⁴JILA, University of Colorado, USA — ⁵Max-Planck-Institut für Kernphysik, Heidelberg — ⁶PTB Braunschweig — ⁷CERN, Genf, Schweiz

The exceptionally low energy of the isomeric first excited nuclear state of ²²⁹Th, which has recently been constrained to 8.28±0.17 eV (i.e. λ=149.7±3.1 nm)[1], allows for direct laser excitation with current technology. This offers the unique opportunity to develop a nuclear clock capable of competing or even outperforming existing atomic clocks. One of the next steps towards the realization of such a clock is the determination of the ²²⁹Th isomer’s ionic lifetime (theoretically expected to range between 10³ − 10⁴ seconds) via hyperfine spectroscopy. In order to achieve the required long ion storage time, a cryogenic Paul-trap with a corresponding mass-selective ion guide system has been set up at LMU Munich. The talk will present this new experimental platform. This work was supported by DFG (Th956/3-2) as well as by the European Union’s Horizon 2020 research and innovation program under grant agreement 6674732 "nuClock" and the ERC Synergy Grant "ThoriumNuclearClock".

[1] B. Seiferle et al., Nature 573, 243 (2019).