SAMOP 2023 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)

A 6.4: Vortrag

Montag, 6. März 2023, 18:00–18:15, F107

Probing a beyond standard model force via isotope shift spectroscopy in ultracold mercury — •Thorsten Groh, Felix Affeld, and Simon Stellmer — Physikalisches Institut, Nussallee 12, Universität Bonn, 53115 Bonn, Germany

High precision spectroscopy of atomic isotope shifts could probe for a new beyond standard model (SM) force carrier that directly couples electrons and neutrons [Delaunay, PRD 96, 093001; Berengut, PRL 120, 091801], where signatures of such new particles would emerge as nonlinearities in King plots of scaled isotope shifts on different electronic transitions.

While latest spectroscopy of Ytterbium [Hur, PRL 128, 163201; Figueroa, PRL 128, 073001; Ono, PRX 12, 021033] down to the Hz-level already show strong deviations from linearity, it is hard to distinguish new physics from many SM effects like quadratic field shift and nuclear deformations.

Mercury is one of the heaviest laser-coolable elements with a core close to the lead nuclear shell closure, which suppresses nuclear deformations. It is an ideal platform for isotope spectroscopy possessing five naturally occurring bosonic isotopes, all of which we spectroscopically address in a magneto-optical trap. Our precision isotope shift spectroscopy in ultracold mercury on a total of five optical transitions combined with multidimensional King plot analysis show strong nonlinearities. We report on our latest improvements in the measurements and on new analysis of the nonlinearity origins.