Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: Precision Spectroscopy of atoms and ions I (joint session A/Q)

A 3.8: Vortrag

Montag, 11. März 2019, 12:15–12:30, S HS 2 Physik

Towards laser spectroscopy of the ground-state hyperfine splitting in muonic hydrogen — •A. Ouf and R. Pohl on behalf of the CREMA collaboration — Johannes Gutenberg-Universität Mainz, Institut für Physik, QUANTUM & Exzellenzcluster PRISMA +, Mainz, Germany

Simple muonic atoms have proven to be of particular interest for studies of nuclear properties, such as the charge [1] and (magnetic) Zemach radii [2], and the nuclear polarizabilities. The Zemach radius encodes the magnetic properties of the proton and it is the main nuclear structure contribution to the hyperfine splitting (HFS) in hydrogen. The 1S-HFS in ordinary hydrogen (the famous 21 cm line) has been measured with 12 digits accuracy almost 50 years ago [3], but its comparison with QED calculations is limited to 6 digits by the uncertainty of the Zemach radius determined from elastic electron-proton scattering. We will present the ongoing measurement of the CREMA Collaboration at PSI which aims at a first measurement of the 1S-HFS in muonic hydrogen with the potential for a hundredfold improved determination of the proton structure effects (Zemach radius and polarizability), which will eventually improve the QED test using the 21 cm line by a factor of 100.

[1] R. Pohl et al., Nature 466, 213 (2010)
[2] A. Antognini et al., Science 339, 417 (2013)
[3] L. Essen et al, Nature 229, 110 (1971)