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T: Fachverband Teilchenphysik

T 18: Methods in Astroparticle Physics I

T 18.2: Vortrag

Montag, 16. März 2026, 16:30–16:45, KS 00.004

The detection principle and implementation of the Cryogenic Outer Veto for the NUCLEUS experiment — •Alexandra Schröder for the NUCLEUS collaboration — Technische Universität München

Coherent Elastic Neutrino-Nucleus Scattering (CEvNS) is predicted in the Standart model to be a neutral current process with low recoil energies in the order of keV. Its experimental observation requires extremely sensitive detectors, enabling the study of neutrino properties and offering the potential to probe physics beyond the Standard Model. The NUCLEUS experiment is designed to observe CEvNS using cryogenic calorimeters with ultra-low energy thresholds oi the order of a few 10 eV. The final experimental site will be at the Chooz nuclear power plant in France, featuring a relatively low overburden of 3 m water equivalent. As a result, a robust background mitigation strategy is required to achieve the desired sensitivity. The Cryogenic Outer Veto (COV), consisting of kilogram-scale high-purity germanium crystals, constitutes a key component of the NUCLEUS background suppression system. The realization of the COV was a collaboration-wide effort. Prior to the integration of the full COV configuration consisting of six crystals, a single COV crystal was tested and operated within the experiment. The complete six-crystal COV system was integrated in December 2024. In this talk, I will present the design and operating principle of the COV, along with an overview of the upscaling process from a single crystal to the final six-crystal configuration.

Keywords: Cryogenic Outer Veto