Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Precision spectroscopy of atoms and ions (joint session A/Q)
Q 44.18: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
The muonic hydrogen ground state hyperfine splitting experiment — •Ahmed Ouf on behalf of the CREMA collaboration1, Siddarth Rajamohanan1, Lukas Goerner1, and Randolf Pohl2 — 1Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik, Mainz, Germany — 2Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik & Exzellenzcluster PRISMA +, Mainz, Germany
The ground state hyperfine splitting (1S-HFS) in ordinary hydrogen (the famous 21 cm line) has been measured with 12 digits accuracy almost 50 years ago [1], but its comparison with QED calculations is limited to 6 digits by the uncertainty of the Zemach radius determined from elastic electron-proton scattering. The Zemach radius encodes the magnetic properties of the proton and it is the main nuclear structure that contributes to the hyperfine splitting (HFS) in hydrogen together with the proton polarizability. The ongoing experiment of the CREMA Collaboration at PSI aims at the first measurement of the 1S-HFS in muonic hydrogen (µ p). The measurement aims at determining the proton structure effects referred to as the two-photon exchange with an accuracy of 1 × 10−4, which is a hundredfold improved determination of (Zemach radius and the proton polarizability). Eventually, then this will improve the QED test using the 21 cm line by a factor of 100. We will present the current status of the experimental effort including the unique detection system and the novel laser development.