Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 31: Scintillator Detectors I
T 31.6: Talk
Tuesday, March 17, 2026, 17:30–17:45, KH 01.014
Optical simulations of plastic and CeBr3 scintillator modules read out by SiPMs for the scintLaCharm Compton camera — •Kaveh Kooshkjalali, Alexander Deisting, Theresa Hahn, and Uwe Oberlack — Institute of Physics and Excellence Cluster PRISMA++
Within the framework of the ScintLaCHARM (Localization and CHAracterization of Radioactive Material) Compton Camera Project, which aims at the development of scintillation-based Compton cameras for applications such as nuclear power plant decommissioning, we present a Geant4-based optical simulation developed to study scintillation and Cherenkov light production and transport in plastic and CeBr3 scintillators with silicon photomultiplier (SiPM) readout.
The detector geometry models two types of scintillation medium, reflective boundaries, and segmented top and bottom SiPM planes. Wavelength-dependent optical material properties and surface models are implemented to describe refraction, absorption, and reflection at all interfaces. Optical photon transport is tracked in detail, including absorption in the crystal, escape into the surrounding volume, and multiple reflections prior to detection. A SiPM sensitive detector records photon boundary crossings and classifies hits by detector plane, timing, and reflection history.
We study the impact of geometry and optical properties on detector performance, simulating light-collection efficiency, timing response, and detector position and energy resolution.