SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 26: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 26.2: Talk
Thursday, March 9, 2023, 15:00–15:15, F303
Collinear laser spectroscopy in 12,13C4+ — •Patrick Müller1, Phillip Imgram1, Kristian König1, Bernhard Maass2, and Wilfried Nörtershäuser1 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Argonne National Laboratory, Chicago, IL, USA
Laser spectroscopy has since long been used to determine differential nuclear charge radii δ⟨ r2⟩ for stable and short-lived isotopes. Recently, much effort was put in improved atomic structure calculations of helium-like systems to be able to extract absolute nuclear charge radii from 1s2s 3S1 → 1s2s 3PJ transition frequencies [1]. This can be used in light He-like ions, i. e., Be to N, in which the metastable state has sufficient lifetime to perform collinear laser spectroscopy and the transition wavelengths are in the laser accessible region.
We report on high-precision collinear laser spectroscopy measurements of the 1s2s 3S1 → 1s2s 3P0,1,2 transitions in 12,13C4+ using the Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) at the Institute of Nuclear Physics, TU Darmstadt. Although theory has not reached the accuracy to directly extract ⟨ r2⟩ in He-like systems with competitive uncertainty yet, mass-shift calculations between 12,13C4+ will provide δ⟨ r2⟩12,13 with very high precision in the conventional approach. The measured hyperfine structure of 13C4+ which is modulated by significant hyperfine mixing will serve as another benchmark for testing atomic-structure theory. This project is supported by DFG (Project-ID 279384907 - SFB 1245).
[1] Yerokhin et al., Phys. Rev. A 106, 022815 (2022)