Search for coherent elastic neutrino-nucleus scattering at a nuclear reactor with CONNIE 2019 data
hep-ex
/ Authors
CONNIE collaboration, Alexis Aguilar-Arevalo, Javier Bernal, Xavier Bertou, Carla Bonifazi, Gustavo Cancelo, Victor G. P. B. de Carvalho, Brenda A. Cervantes-Vergara, Claudio Chavez, Gustavo Coelho Corrêa
and 26 more authors
Juan C. D'Olivo, João C. dos Anjos, Juan Estrada, Aldo R. Fernandes Neto, Guillermo Fernandez Moroni, Ana Foguel, Richard Ford, Julián Gasanego Barbuscio, Juan Gonzalez Cuevas, Susana Hernandez, Federico Izraelevitch, Ben Kilminster, Kevin Kuk, Herman P. Lima, Martin Makler, Mauricio Martinez Montero, Larissa Helena Mendes, Jorge Molina, Philipe Mota, Irina Nasteva, Eduardo Paolini, Dario Rodrigues
/ Abstract
The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) is taking data at the Angra 2 nuclear reactor with the aim of detecting the coherent elastic scattering of reactor antineutrinos with silicon nuclei using charge-coupled devices (CCDs). In 2019 the experiment operated with a hardware binning applied to the readout stage, leading to lower levels of readout noise and improving the detection threshold down to 50 eV. The results of the analysis of 2019 data are reported here, corresponding to the detector array of 8 CCDs with a fiducial mass of 36.2 g and a total exposure of 2.2 kg-days. The difference between the reactor-on and reactor-off spectra shows no excess at low energies and yields upper limits at 95% confidence level for the neutrino interaction rates. 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.