Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 21: Precision Spectroscopy IV - highly charged ions (joint session A/Q)
A 21.1: Invited Talk
Tuesday, March 6, 2018, 14:00–14:30, K 1.016
High precision hyperfine measurements in bismuth challenge bound-state strong field QED — •Rodolfo Sánchez — GSI, Darmstadt, Germany
High-resolution laser spectroscopy on the ground-state hyperfine splitting of hydrogen-like and lithium-like bismuth ions (Bi82+, 80+) has been carried out at the "Experimentier Speicherring" (ESR) at the GSI Helmholtz-Center for Heavy Ion Research in Darmstadt. The accuracy of the hyperfine splitting determination was improved by more than an order of magnitude compared to previous measurements and sufficient to test bound-state strong-field QED in the so-called specific difference between the two hyperfine splitting energies for the first time. We found a surprising discrepancy from the atomic theory predictions by more than 7σ. I will report on these measurements, possible explanations for this "hyperfine puzzle" of strong-field QED and on further activities that have been started to resolve this issue.