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

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.

23 pages, 14 figures

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Cited by in corpus (22)

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• Direct observation of coherent elastic antineutrino-nucleus scattering
• Exploring coherent elastic neutrino-nucleus scattering using reactor electron antineutrinos in the NEON experiment
• Physics implications of recent Dresden-II reactor data
• Final CONUS results on coherent elastic neutrino-nucleus scattering at the Brokdorf reactor
• Implications of the first CONUS+ measurement of coherent elastic neutrino-nucleus scattering
• Constraining Light Mediators via Detection of Coherent Elastic Solar Neutrino Nucleus Scattering
• Reactor neutrino liquid xenon coherent elastic scattering experiment
• Probing neutrino magnetic moments and the XENON1T excess with coherent elastic solar neutrino scattering
• Fast Single-Quantum Measurement with a Multi-Amplifier Sensing Charge-Coupled Device
• On the impact of the Migdal effect in reactor CE$\nu$NS experiments
• COHERENT production of a dark fermion
• A neutrino window to scalar leptoquarks: from low energy to colliders
• Achieving Single-Electron Sensitivity at Enhanced Speed in Fully-Depleted CCDs with Double-Gate MOSFETs
• Incoherent solar-neutrino scattering off the stable Tl-isotopes
• Sterile neutrino searches with reactor antineutrinos using coherent neutrino-nucleus scattering experiments
• Searches for CEνNS and Physics beyond the Standard Model using Skipper-CCDs at CONNIE
• Particle background characterization and prediction for the NUCLEUS reactor CE$\nu$NS experiment
• Neutron capture-induced nuclear recoils as background for CE$\nu$NS~measurements at reactors
• Nuclear Recoil Identification in a Scientific Charge-Coupled Device
• Testing lepton non-unitarity with the next generation of Germanium-based CE$\nu$NS reactor experiments
• Skipper-CCDs: current applications and future