Bonn 2020 – wissenschaftliches Programm
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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 Nörtershäuser1 — 1IKP, 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 3S1 → 3PJ 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)  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).
 V.A. Yerokhin et al., Phys. Rev. A 98, 032503 (2018)