Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)

Q 40.4: Talk

Thursday, March 14, 2024, 11:45–12:00, HS 1010

MMC Array to Study X-ray Transitions in Muonic Atoms — •Daniel Unger, Andreas Abeln, Thomas Elias Cocolios, Ofir Eizenberg, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, Cesar Godinho, Michael Heines, Daniel Hengstler, Paul Indelicato, Daniel Kreuzberger, Klaus Kirch, Andreas Knecht, Jorge Machado, Ben Ohayon, Nancy Paul, Randolf Pohl, Katharina von Schoeler, Stergiani Marina Vogiatzi, and Frederik Wauters — for the QUARTET Collaboration

The QUARTET collaboration aims to improve the accuracy of absolute nuclear charge radii of light nuclei from Li to Ne. A proof-of-principle measurement with lithium, beryllium and boron has recently been performed at the Paul Scherrer Institute. Conventional solid-state detectors do not provide sufficient accuracy in the relevant energy range. We use a low temperature Metallic Magnetic Calorimeter (MMC) array for high-precision X-ray spectroscopy of low-lying states in muonic atoms. MMCs are characterized by a high resolving power of several thousand and a high quantum efficiency in the energy range of interest. We present the experimental setup and the performance of the detector used. We discuss the first preliminary spectra and systematic effects in this first measurement. The obtained data in combination with the achieved energy resolution and calibration should allow a more precise characterization of the muonic X-ray lines. With the knowledge gained, a significant improvement in the determination of nuclear charge radii is expected.

Keywords: Metallic Magnetic Calorimeter; X-ray Spectroscopy; Muonic Atoms; Absolute Nuclear Charge Radii; QUARTET