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EP: Fachverband Extraterrestrische Physik

EP 5: Astrophysics

EP 5.6: Vortrag

Mittwoch, 28. Februar 2024, 15:30–15:45, ELP 1: HS 1.22

Trajectory-Dependent Photo Emission and Detection of Scintillation Light in a Bismut Germanium Oxide Scintillator Crystal — •Tom Ruge, Stephan Böttcher, and Ava Pohley — Christian-Albrechts-Universität zu Kiel IEAP - Extraterrestrische Physik

The Earth is continuously exposed to high-energy charged particles, so-called Galactic Cosmic Rays (GCRs). When these particles hit the Earth’s atmosphere, they create a cascade of secondary particles. CHAOS (CHerenkov Atmospheric Observation System) is a particle telescope that is developed at the Department of Extraterrestrial Physics at Kiel University by a team of students to measure the different particle species of the primary GCRs. It consists of multiple solid-state detectors, a Cherenkov aerogel scintillator and a BGO scintillation calorimeter. The hexagonal BGO crystal with a side length of 52 mm and a thickness of 20 mm is one of the largest BGO crystals ever used for particle detection, which is why geometric effects within the BGO are more interesting than ever. When a charged particle interacts with the crystal, isotropic light is emitted that is measured by attached photodiodes. As part of my bachelor thesis, I am investigating in an experiment how much light is measured by the individual photodiodes, depending on where the particle has flown through the crystal. CHAOS is supposed to fly on a stratospheric balloon as part of the BEXUS (Balloon Experiments for University Students) program in fall 2024. This is why it is essential to investigate the properties of the used BGO. I will present my experiment and the findings.

Keywords: Scintillator; BEXUS; Particle Detection; BGO; Photodiode