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Q: Fachverband Quantenoptik und Photonik

Q 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)

Q 19.2: Vortrag

Dienstag, 7. März 2023, 11:15–11:30, F303

Nuclear polarization effects in atoms and ions — Victor V. Flambaum^1,2,3, Igor B. Samsonov¹, Hoang Bao Tran Tan^1,4, and •Anna V. Viatkina^2,3,5,6 — ¹School of Physics, University of New South Wales, Sydney 2052, Australia — ²Helmholtz Institute Mainz, GSI Helmholtzzentrum für Schwerionenforschung, 55099 Mainz, Germany — ³Johannes Gutenberg University Mainz, 55099 Mainz, Germany — ⁴Department of Physics, University of Nevada, Reno, Nevada 89557, USA — ⁵Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — ⁶Institute of Mathematical Physics, Technical University Braunschweig, 38106 Braunschweig, Germany

Precision isotope shift spectroscopy offers an opportunity to search for new physics by means of measuring King plot (KP) nonlinearities. However, KP nonlinearities might arise from standard-model effects as well, thus obscuring possible new-physics signal. One of such effects is the variation of nuclear polarizabilities between isotopes. Even though this effect is estimated to be relatively small and not the leading contribution to KP nonlinearity, it should not be overlooked in the interpretation of the data. In our work, we calculated energy-level shifts due to electric-dipole and -quadrupole nuclear polarization for 1s, 2s, 2p_1/2 states in hydrogenlike ions, and for high-ns valence states in neutral atoms with Z≥ 20. We fit the results with elementary functions of nuclear parameters and derive a set of effective potentials which may be used to calculate polarization energy-level shifts in many-electron atoms and ions.