Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Precision spectroscopy of atoms and ions IV (with Q)

A 39.5: Vortrag

Freitag, 27. März 2015, 12:00–12:15, C/kHS

The Experimental Apparatus of the Muonic Helium Lamb Shift Measurement — •Beatrice Franke and the CREMA Collaboration — Max-Planck-Institute of Quantum Optics, Garching

Muonic atoms have an increased sensitivity on finite size effects of the nucleus due to the approximately 200-fold mass of the muon compared to the electron. The Lamb shift experiment of the CREMA collaboration in muonic hydrogen [1] and deuterium allowed to determine the proton radius and other nuclear properties with an improved precision compared to previously conducted measurements. As a successor experiment, the determination of the Lamb shift in the muonic helium ions mu3He+ and mu4He+ [2] will be a contribution to solving the proton radius puzzle [3] as well as the discrepancy in electronic isotope-shift measurements. In this talk, an overview of the components of the experimental apparatus is given: Details on the muon beam line, the laser scheme and the different detector systems as well as other specifics necessary to perform this high sensitivity measurement.

[1] R. Pohl et al. (CREMA coll.), Nature 466, 213 (2010)

[2] A. Antognini et al. (CREMA coll.), Can. J. Phys. 89, 47-57 (2011)

[3] R. Pohl et al., Annu. Rev. Nucl. Part. Sci. 63, 175-204 (2013)