Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Neutrino Physics II

T 22.5: Talk

Tuesday, March 17, 2026, 17:15–17:30, AudiMax

First observation of reactor antineutrinos by coherent scattering with CONUS+ — •Nicola Ackermann for the CONUS collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The CONUS+ experiment measures coherent elastic reactor anti-neutrino nucleus scattering (CEvNS) on germanium nuclei. The detector is located at the KKL nuclear power plant in Leibstadt, Switzerland at a distance of 20.7 m from the reactor core. It uses four High Purity Germanium detectors with energy thresholds of ~ 160 eV. In Run 1 of the experiment, which lasted from November 2023 to August 2024, the first observation of a CEvNS signal from a nuclear reactor was achieved. In 119 days of data taking (395+-106) anti-neutrinos were measured, compared to a predicted number of (347+-59) events. For improved sensitivity, the experiment is currently taking data in Run 2 using three new 2.4 kg germanium detectors.

Keywords: Coherent Elastic Neutrino Nucleus Scattering; Germanium; Neutrinos; Nuclear Reactor