SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Precision Measurements
Q 51.1: Vortrag
Donnerstag, 9. März 2023, 14:30–14:45, A320
Search of dark matter boson via isotope shift measurements in ytterbium ions — •Chih-Han Yeh1, Laura S. Dreissen1, Melina Filzinger1, Nils Huntemann1, Henning A. Fürst1,2, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
Astronomical observations support the existence of dark matter, but its origin and composition are unknown. A dark matter boson coupling neutrons and electrons in an atom could be observed with isotope shift measurements and a so-called King-plot analysis [1-3]. Here, known atomic and nuclear effects that dominate the isotope shift follow a linear scaling. We performed accurate isotope shift measurements in trapped ytterbium ions to search for these interactions via non-linearities in the King-plot. We determined the absolute frequencies of the 2S1/2→ 2D5/2 and 2S1/2→ 2F7/2 transitions in all 5 stable even isotopes of Yb+ to the ∼10 Hz level. We reproduce the non-linearities observed in Ref. [4], but reach a 10 to 100 fold higher accuracy. With these results we hope to shed light onto the source of the observed non-linearity and investigate a possible coupling from a new boson beyond the previously explored parameter range.
[1] C. Delaunay, et al., Phys. Rev. D 96, 093001 (2017). [2] J. C. Berengut, et al., Phys. Rev. Lett. 120, 091801 (2018). [3] W. H. King, Isotope Shifts in Atomic Spectra (Plenum Press, New York, 1984). [4] J. Hur, et al., Phys. Rev. Lett. 128, 163201 (2022.)