Laser Spectroscopy of He-Like Carbon and Further Prospects for Other He-Like Light SystemsHYBRID

The nuclear charge radius is a key observable in nuclear structure studies. Using the Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) at the Institute of Nuclear Physics of TU Darmstadt, an all-optical approach for the nuclear charge radius determination was tested with the well-known nucleus of 12C. Here, the nuclear charge radius of 12C was extracted purely from laser spectroscopy measurements that were combined with non-relativistic QED calculations. Laser excitation of helium-like C4+ started from the metastable state with a lifetime of 21 ms to reach the
2 3S1 states. The precision of the corresponding transition frequencies was improved by more than 3 orders of magnitude. Furthermore, the hyperfine spectrum of 13C4+ was measured and the differential mean-square charge radius between 12C and 13C was extracted in combination with state-of-the-art atomic structure calculations. This represents the first optical charge radius measurements in the carbon isotope chain and will be the starting point for the necessary improvement of charge radii of the light-mass nuclei. In this talk, I will give an overview of the project, present the measured transition frequencies along with the extracted all-optical nuclear charge radius of 12,13C and give an outlook on upcoming measurements at COALA. Furthermore, prospects for other He-like light systems also in the context of radioactive ion beam facilities will be discussed.

This project was supported by DFG (Project-ID 279384907 - SFB 1245) and by BMBF (05P21RDFN1).

https://gsi-fair.zoom.us/j/63856816325
Meeting-ID: 638 5681 6325
Passcode: AP_Seminar
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