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The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) is taking dataat the Angra 2 nuclear reactor with the aim of detecting the coherent elasticscattering of reactor antineutrinos with silicon nuclei using charge-coupleddevices (CCDs). In 2019 the experiment operated with a hardware binning appliedto the readout stage, leading to lower levels of readout noise and improvingthe detection threshold down to 50 eV. The results of the analysis of 2019 dataare reported here, corresponding to the detector array of 8 CCDs with afiducial mass of 36.2 g and a total exposure of 2.2 kg-days. The differencebetween the reactor-on and reactor-off spectra shows no excess at low energiesand yields upper limits at 95% confidence level for the neutrino interactionrates. In the lowest-energy range, 50-180 eV, the expected limit stands at 34(39) times the standard model prediction, while the observed limit is 66 (75)times the standard model prediction with Sarkis (Chavarria) quenching factors.

Search for coherent elastic neutrino-nucleus scattering at a nuclear reactor with CONNIE 2019 data