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T: Fachverband Teilchenphysik

T 31: Scintillator Detectors I

T 31.8: Vortrag

Dienstag, 17. März 2026, 18:00–18:15, KH 01.014

Opaque liquid scintillator prototype for Light Dark MatterSearches — •Jonas Pätschke for the MAGIX collaboration — Institute for Nuclear Physics, Johannes Gutenberg-University Mainz, Germany

In the ongoing search for light dark matter, the DarkMESA and NuDoubt⁺⁺ collaborations have joined forces to explore a new region of parameter space. DarkMESA is an upcoming electron beam dump experiment at the new MESA accelerator facility in Mainz, designed to search for light dark matter particles mediated by a hypothetical dark photon γ’, using a crystal calorimeter for detection. The NuDoubt⁺⁺ experiment will employ an opaque liquid scintillator detector to investigate double beta decay (2ββ) and the beyond Standard Model neutrinoless double beta decay (0νββ), two processes that have yet to be discovered.
This contribution will focus on the ongoing investigation into the use of opaque liquid scintillators as an additional or alternative detector medium to the DarkMESA crystal calorimeter. Such a detector would be able to reject events based on the topological signature. For this purpose, a prototype detector was designed, simulated and tested at the MAMI accelerator at energies around 10 MeV. This detector uses a 22-litre cubic volume of linear alkylbenzene (LAB) scintillator and 255 wavelength-shifting fibres attached to SiPMs arranged in a triangular grid with 10 mm pitch near a beam entrance window. A comparative analysis will be presented, evaluating the simulation and expected performance against the results of this first prototype.

Keywords: Liquid Scintillator; Opaque; Light Dark Matter; DarkMESA; NuDoubt