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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Instrumentation V
HK 26.5: Vortrag
Mittwoch, 18. März 2026, 14:45–15:00, PHIL A 301
A new Liquid Scintillator Veto System for Rare Event Searches — •Michail Kontogoulas 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++ experiments have combined their efforts to probe a new region of parameter space. DarkMESA is a forthcoming electron beam dump experiment to be located in the new MESA accelerator facility in Mainz, designed to detect light dark matter particles using a PbF2 crystal calorimeter. The NuDoubt++ experiment will utilize an opaque liquid scintillator detector to investigate the double beta decay (2β+) and the neutrinoless double beta decay (0νββ). Due to the expected rarity of these interactions, exceptional background rejection is crucial for identifying potential events. Therefore, both experiments plan to use passive and active shielding layers against background radiation.
This contribution will focus on the development of a liquid scintillator veto prototype for use in both experiments. The prototype will feature a hexagonal geometry with an active volume of approximately 0.351 m3, filled with a linear alkylbenzene (LAB) scintillator, doped with 0.2wt.% Gadolinium for enhanced neutron tagging. The scintillator will be read out by seven 5-inch PMTs mounted on the top surface of the volume. A comparative analysis will be presented, comparing simulation results with initial tests of the prototype to evaluate veto efficiency, with particular emphasis on neutron rejection, given their significance as a background in dark matter searches.
Keywords: DarkMESA; NuDoubt; Light Dark Matter; Liquid Scintillator; Veto System