Speaker
Description
The QUARTET collaboration aims for high-precision spectroscopy of muonic atoms at the Paul Scherrer Institute (PSI) to extract nuclear charge radii in simple atomic systems. A key motivation of the experiment is to reduce the relative uncertainties of nuclear charge radii for stable isotopes ranging from Lithium to Neon. The current uncertainties in this region suffer mainly from experimental uncertainties. To fill this uncertainty gap, Metallic Magnetic Calorimeters (MMC) are employed, which provide a unique combination of superb energy resolution, linearity and stability. This contribution will present the experimental concept and first results from the beam time conducted in October 2025, highlighting the performance of the MMC-based detection system and the current status of data analysis.
