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T: Fachverband Teilchenphysik

T 26: Axions/ALPs I

T 26.6: Vortrag

Dienstag, 1. April 2025, 17:30–17:45, VG 0.110

Development of a Cosmic Muon and Neutron Veto System for BabyIAXO — •Dhruv Chouhan¹, Elisa Ruiz Choliz², and Matthias Schott¹ for the IAXO collaboration — ¹Rhenish Friedrich Wilhelm University of Bonn, Germany — ²Johannes Gutenberg University of Mainz, Germany

The International Axion Observatory (IAXO) experiment is a cutting-edge helioscope designed to search for axions and axion-like particles (ALPs) produced in the Sun. As a preliminary step, the BabyIAXO project has been proposed as a smaller-scale version of the helioscope, with the capability to achieve a sensitivity to the axion-photon coupling of 1.5 · 10⁻¹¹ GeV⁻¹ for axion masses up to 0.25 eV. This region of parameter space is particularly intriguing for axion physics.

A key challenge of the experiment lies in the design of a cosmic muon and neutron veto system, which will ensure an ultra-low-background environment for the x-ray detection system. This talk highlights the simulation and hardware advancements in developing the BabyIAXO cosmic-ray veto system, which leverages light-guided organic plastic scintillators coupled with Silicon Photomultiplier (SiPM) sensors.

To further optimize the veto system, Geant4 simulation studies have been conducted to replicate the performance of scintillators integrated with embedded wavelength-shifting fibers, accurately modeling energy deposition by various interacting particles.

Keywords: Muon Veto; Silicon Photomultiplier; Geant4 simulation; Scintillation Detectors; IAXO