Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 98: Search for Dark Matter 4

T 98.5: Talk

Thursday, March 7, 2024, 17:00–17:15, Geb. 30.35: HSI

Water Cherenkov muon veto for the COSINUS experiment — •Kumrie Shera for the COSINUS collaboration — Max-Planck Institue for Physics, Munich, Germany

The Cryogenic Observatory for Signals seen in Next Underground Searches (COSINUS) is a direct dark matter search utilizing sodium iodide (NaI) as a cryogenic calorimeter. The cryogenic facility is located in the hall B at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The NaI cryogenic detectors will be housed in a dry dilution refrigerator positioned at the center of a water tank with dimensions of 7 meters in diameter and height. The water serves as passive shielding against ambient radiation. High-energy muons can reach the detector surroundings, generating muon-induced neutrons that can cause nuclear recoils and potentially mimic a dark matter signal. To actively identify and veto against these events, the water tank will be equipped with 28 photo-multiplier tubes (PMTs), enabling the operation of the tank as a Cherenkov detector. This contribution introduces the water Cherenkov muon veto for the COSINUS experiment.

Keywords: Dark matter; Direct detection; Cryogenic detector; TES; muon veto