SAMOP 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 51: Precision Measurements
Q 51.5: Vortrag
Donnerstag, 9. März 2023, 15:30–15:45, A320
Indirect excitation mechanisms for the 229Th isomer — •Tobias Kirschbaum1, Nikolay Minkov2, and Adriana Pálffy1 — 1Julius-Maximilians-Universität Würzburg, Germany — 2Institute for Nuclear Research and Nuclear Engineering, Sofia, Bulgaria
Amongst all nuclei, the 229Th nucleus presents the lowest first excited state at around 8 eV with an expected radiative lifetime of a few hours. Hence, this transition should be accessible with VUV light. In combination with its narrow linewidth, this renders 229Th an ideal candidate for a nuclear clock with excellent accuracy and stability [1]. However, a hindrance towards its experimental realization is the relatively large uncertainty on the transition energy which makes direct laser excitation cumbersome.
Here, we investigate theoretically two different approaches to indirectly populate 229Th’s isomeric state. The first approach deals with quantum optical transfer schemes involving STIRAP and π-pulses via the second excited state at 29.19 keV at the Gamma Factory [2]. The second approach considers Electronic Bridge (EB) schemes in a VUV-transparent crystal environment doped with 229Th [3]. Here, EB involves electronic defect states which appear in the band gap due to 229Th doping. We present different EB schemes and the corresponding excitation rates for 229Th:LiCAF.
[1] E. Peik et al., Quantum Sci. Technol. 6, 034002 (2021).
[2] T. Kirschbaum, N. Minkov and A. Pálffy, Phys. Rev. C 105, 064313 (2022).
[3] B. S. Nickerson et al., Phys. Rev. A 103, 053120 (2021).