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Solaro, Cyrille; Meyer, Steffen; Fisher, Karin; Berengut, Julian C; Fuchs, Elina; Drewsen, Michael
Physical review letters, 09/2020, Letnik: 125, Številka: 12Journal Article
We perform high-resolution spectroscopy of the 3d2D3/2 − 3d2D5/2 interval in all stable even isotopes of ACa+ (A = 40, 42, 44, 46, and 48) with an accuracy of ∼20 Hz using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the 4s 2S1/2 ↔ 3d2D5/2 transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the standard model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in Ba+ and Yb+. Finally, the data yield isotope shifts of the 4s 2S1/2 ↔ 3d2D3/2 transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret Phys. Rev. A 100, 022514 (2019).
