Improved isotope-shift-based bounds on bosons beyond the Standard Model through measurements of the ${}^2$D${}_{3/2}{-}^2$D${}_{5/2}$ interval in Ca${}^{+}$

Abstract

We perform high-resolution spectroscopy of the $3$d${}^2$D${}_{3/2}-3$d${}^2$D${}_{5/2}$ interval in all stable even isotopes of ${}^A$Ca${}^{+}$ (A = 40, 42, 44, 46 and 48) with an accuracy of $\sim$ 20 Hz using direct frequency-comb Raman spectroscopy. Combining these data with isotope shift measurements of the 4s${}^2$S${}_{1/2}\leftrightarrow 3$d${}^2$D${}_{5/2}$ 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${}^2$S${}_{1/2}\leftrightarrow 3$d${}^2$D${}_{3/2}$ transition at 10 part-per-billion through combination with recent data of Knollmann et al (2019).

6 pages + appendix, 3 figures, 2 tables

References in corpus (9)

• Stellar cooling bounds on new light particles: plasma mixing effects
• Particle Physics Models for the 17 MeV Anomaly in Beryllium Nuclear Decays
• Neutron scattering and extra short range interactions
• Absolute frequency measurement of the 40Ca+ S1/2 - D5/2 clock transition
• Probing new spin-independent interactions through precision spectroscopy in atoms with few electrons
• Constraints on new interactions from neutron scattering experiments
• Dynamical Evidence For a Fifth Force Explanation of the ATOMKI Nuclear Anomalies
• Spectroscopy of a synthetic trapped ion qubit
• Unexpectedly large difference of the electron density at the nucleus in the 4p ${}^2$P${}_{1/2,3/2}$ fine-structure doublet of Ca${}^{+}$