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T: Fachverband Teilchenphysik

T 76: Silicon Detectors VII

T 76.6: Vortrag

Donnerstag, 19. März 2026, 17:30–17:45, KH 01.022

Results from an HV-MAPS-Based Detector Prototype for Position-Resolved µSR Measurements — •Lukas Mandok for the HVMAPS HD collaboration — Physikalisches Institut, Heidelberg, Germany

Muon Spin Spectroscopy (µSR) is a well-established technique in material science for probing magnetic properties at the atomic scale. Conventional µSR spectrometers based on scintillators are fundamentally limited by coarse granularity and strict pile-up constraints, which restrict the usable muon rate and prevent spatially resolved measurements.
To overcome these limitations, we developed a pixel-based µSR detector using four ultra-thin HV-MAPS tracking layers based on MuPix11 sensor modules, which record incoming muons and decay positrons with high spatial precision. This enables accurate track reconstruction and a sub-millimeter determination of the decay vertex inside the sample. The approach further supports measurements of multiple samples and composite materials, while the resulting spatial information allows three-dimensional sample reconstruction and provides access to local magnetic fields by correlating vertex positions with the position-dependent precession signal.
The detector was operated several times at the πE3 beamline at PSI, demonstrating stable performance at beam intensities two orders of magnitude beyond the limits of scintillator-based systems. Its combination of high-rate capability and precise vertexing marks a significant step toward next-generation µSR spectrometers.

Keywords: pixel sensors; HV-MAPS; muon spin specoscropy; vertex reconstruction; MuPix