Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Structure and Dynamics of Nuclei X

HK 59.5: Vortrag

Freitag, 3. April 2020, 12:15–12:30, J-HS E

Current status of COALA - Towards an all-optical nuclear charge radius determination — •Phillip Imgram1, Zoran Andelkovic2, Axel Buß3, Volker M. Hannen3, Kristian König4, Jörg Krämer1, Konstantin Mohr1, Patrick Müller1, Rodolfo Sánchez2, and Wilfried Nörtershäuser11IKP, TU Darmstadt — 2GSI, Darmstadt — 3IKP, WWU Münster — 4NSCL, MSU, East Lansing, MI, USA

The Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) at the Institute of Nuclear Physics of TU Darmstadt has been designed to perform high-precision experiments on stable isotopes for high-voltage measurements, atomic physics and nuclear structure research. The planned upgrade with an electron-beam ion source will allow us to study transitions in multiply-charged ions. Here, the focus will be on light ions to determine nuclear charge radii with an all-optical approach, i.e. without referencing to charge radii determined by elastic electron scattering or transitions in muonic atoms. Therefore, the 3S13PJ transitions of He-like ions will be measured to an accuracy of <1 MHz with simultaneous collinear and anticollinear laser spectroscopy. This experimental value can directly be compared with nonrelativistic QED calculations (NRQED) [1] that are currently being performed. This contribution will summarize the current status of the project which is supported by BMBF (05P19PMFA1 and 05P19RDFAA) and by DFG (SFB 1245).
[1] V.A. Yerokhin et al., Phys. Rev. A 98, 032503 (2018)

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