Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 82: Neutrino physics 9

T 82.1: Talk

Thursday, March 7, 2024, 16:00–16:15, Geb. 20.30: 2.058

Final CEvNS result of the CONUS experiment at the Brokdorf reactor — •Nicola Ackermann for the CONUS collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The CONUS experiment (COherent elastic NeUtrino nucleus Scattering) aimed to detect coherent elastic neutrino-nucleus scattering (CEvNS) of reactor antineutrinos on germanium nuclei by measuring their recoil after such an interaction. It operated from 2017 to 2022 at 17m distance from the 3.9 GWth core of the Brokdorf nuclear power plant (Germany). The experiment employed four 1 kg point-contact high-purity germanium (HPGe) detectors, which provided an energy threshold of 210 eV and background rates in the order of 10 events per kg, day and keV.

The analysis of the final CONUS data set allows to establish the current best limit on CEvNS from a nuclear reactor with a germanium target, improving the previous CONUS result by an order of magnitude. Moreover, this new result refutes other measurements where quenching factors deviating significantly from Lindhard theory were considered. The results from the last physics run together with the quenching measurements performed by CONUS will be discussed in this talk.

Keywords: Neutrinos; CEvNS; Reactors; Germanium; Low background