Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 5: Near-Earth Space I & Planets and Small Bodies II

EP 5.1: Vortrag

Dienstag, 1. April 2025, 16:15–16:30, ZHG005

Preliminary Results of the CHerenkov Atmospheric Observation System (CHAOS) from the 2024 Balloon Experiments for University Students (BEXUS) Campaign — •Hannes Ebeling, Pierre Bornfleth, and Ava Pohley — Christian-Albrechts-Universität zu Kiel

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 uses a new detector design to measure the different particle species of the primary GCRs above the so-called Regener-Pfotzer Maximum. To perform these measurements, a combination of multiple solid state detectors and a bismuth germanium oxide (BGO) scintillator is used to measure the energy depositions of the particles. The use of an additional aerogel Cherenkov scintillator allows to separate between electrons and protons. Because electrons are much lighter than ions, electrons with energies above ∼ 1.1 MeV will trigger the Cherenkov detector whereas ions with the same energy are much slower and will not trigger the detector. Developed by a team of students at the Department for Extraterrestrial Physics at Kiel University, CHAOS flew on a stratospheric balloon as part of the BEXUS programme in fall 2024. In this talk I present the preliminary results from CHAOS’s balloon flight.

Keywords: Stratospheric Balloon; Cherenkov; Galactic Cosmic Rays; BEXUS; Particle Telescope