Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 62: Search for Dark Matter III

T 62.8: Vortrag

Mittwoch, 2. April 2025, 18:00–18:15, VG 4.102

Development of a Detector Module with Optimized Scintillation Light Sensitivity for the COSINUS Experiment — •Lutz Ziegele for the COSINUS collaboration — Max-Planck-Institut für Physik, 85748 Garching, Germany

The Cryogenic Observatory for SIgnatures seen in Next generation Underground Searches (COSINUS) is a direct dark matter search located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The experiment operates sodium iodide (NaI) as cryogenic calorimeters. Particle interactions within the crystal generate phonon signals, detected by a remote Transition Edge Sensor (remoTES). Combined with the scintillation signal detected by TES on a surrounding silicon beaker-shaped light absorber, a dual channel readout is achieved, enabling particle discrimination. This contribution focuses on the development of a detector module optimized in terms of scintillation light sensitivity. This is achieved by segmenting the light-collecting silicon beaker into multiple separated wafers surrounding the NaI crystal. The reduced size of these individual light absorbers minimizes heat capacity, thereby increasing sensitivity. The primary objective is the precise characterization of the scintillation light output of the ultrapure NaI crystals, which is vital for the data analysis of the upcoming COSINUS runs. Furthermore, this development represents a foundational step toward creating a detector module with single-photon resolution - a critical advancement for future investigations of dark matter interactions with electrons proposed within the LUCE/OνDES project funded by the Klaus Tschira foundation.

Keywords: Direct dark matter detection; Sodium iodide; Transition Edge Sensor; Scintillation light