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

Journal Article · · JHEP
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  1. Mexico U., ICN
  2. Asuncion Natl. U.
  3. Buenos Aires, CONICET
  4. Rio de Janeiro Federal U.; ITeDA, Buenos Aires
  5. Fermilab
  6. Rio de Janeiro Federal U.
  7. Piri Reis U., Istanbul
  8. Rio de Janeiro, CBPF
  9. Penn State U., University Park, IGC; Penn State U.; CEFET, Rio de Janeiro
  10. Fermilab; Buenos Aires, CONICET
  11. Buenos Aires U.; Buenos Aires, CONICET
  12. Buenos Aires, CONICET; CNEA, Buenos Aires; ITeDA, Buenos Aires
  13. Zurich U.
  14. Rio de Janeiro, CBPF; ITeDA, Buenos Aires
  15. Buenos Aires, CONICET; Fermilab
+ Show Author Affiliations

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.[graphic not available: see fulltext]

Research Organization:
Penn State U.; Asuncion Natl. U.; Rio de Janeiro, CBPF; Penn State U., University Park, IGC; ITeDA, Buenos Aires; Buenos Aires, CONICET; CNEA, Buenos Aires; Rio de Janeiro Federal U.; Mexico U., ICN; Piri Reis U., Istanbul; CEFET, Rio de Janeiro; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Zurich U.; Buenos Aires U.
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1827861
Report Number(s):
FERMILAB-PUB-21-515-AE-PPD-SCD; oai:inspirehep.net:1951144; arXiv:2110.13033
Journal Information:
JHEP, Journal Name: JHEP Vol. 05
Country of Publication:
United States
Language:
English

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Neutrino Detectors
Telescopes