SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Poster I
A 12.35: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
A calcium beam clock for high-precision isotope shift measurements — •Anica Hamer and Simon Stellmer — Physikalisches Institut, Nussallee 12, Universität Bonn, 53115 Bonn, Germany
In the pursuit of finding new particles and new physics beyond the standard model (BSM), the isotope shift of optical transitions treasures a wealth of information on the interaction between the nucleus and the electrons. It can be an approach to find evidence for novel types of interactions between neutrons and electrons that might be mediated by new bosons as force carriers with masses in the 1 keV to 100 MeV mass range [Berengut, PRL 120, 091801].
Calcium is an excellent candidate for BSM searches via isotope shift spectroscopy possessing five stable bosonic isotopes. Where in heavier elements like Ytterbium BSM effects are hard to distinguish from SM effects like quadratic field shift and nuclear deformations [Hur, PRL 128, 163201], the latter are strongly suppressed in the Ca nucleus. We can also benefit from King plot comparisons to ionic Ca data, where latest precision isotope spectroscopy [Solaro, PRL 125, 123003; Gebert, PRL 115, 0530039] down to the Hz-level can already put a limit on BSM scenarios.
The goal of this project is a highly precise determination of the isotope shifts in Ca on the 1S0 → 3P1 (657 nm, 370 Hz linewidth) and 1S0 → 1D2 transitions (458 nm, < 1 kHz) with target uncertainties in the 10 mHz range. The concept is based on Ramsey-Bordé atomic clock setup where two isotopes are interrogated co-located and simultaneously to suppress systematic shifts.