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Improved Isotope-Shift-Based Bounds on Bosons beyond the Standard Model through Measurements of theD23/2−D25/2Interval inCa+
Physical Review Letters ( IF 8.385 ) Pub Date : 2020-09-15 , DOI: 10.1103/physrevlett.125.123003
Cyrille Solaro; Steffen Meyer; Karin Fisher; Julian C. Berengut; Elina Fuchs; Michael Drewsen

We perform high-resolution spectroscopy of the 3dD23/23dD25/2 interval in all stable even isotopes of CaA+ (A=40, 42, 44, 46, and 48) with an accuracy of 20Hz using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the 4sS21/23dD25/2 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 4sS21/23dD23/2 transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret [Phys. Rev. A 100, 022514 (2019)].
更新日期:2020-09-15

 

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