Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Focus Session II: Accurate Nuclear Charge Radii of Light Elements

HK 25.2: Invited Talk

Wednesday, March 12, 2025, 14:25–14:50, HS 1 Physik

Precision radii of light elements using Metallic Magnetic Calorimeters — •Frederik Wauters — Institute for Nuclear Physics, Johannes Gutenberg University Mainz, Mainz, Germany

Nuclear charge radii are crucial for testing nuclear models and serve as key inputs for precision experiments. While optical isotope shift data provide charge radius differences, absolute radii are typically determined through muonic atom spectroscopy, a method particularly sensitive to nuclear finite size effects. Muonic hydrogen and helium have been measured using laser spectroscopy, achieving unprecedented accuracy. However, other light elements remain beyond reach.

At the Paul Scherrer Institute, a new high-precision X-ray spectroscopy initiative called QUARTET has been initiated, utilizing novel Metallic Magnetic Calorimeters. The goal is to improve the accuracy of charge radii measurements for light nuclei by an order of magnitude. Following a successful proof-of-principle measurement in 2023, a first physics run was completed in the 2024 campaign. I will present the current status and outlook of this project.

Keywords: charge radii; exotic atoms; spectrosopy; muon