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Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso

Abstract

Electron antineutrino interactions above the inverse beta decay energy of protons (Eν̄e>1.8 MeV) were looked for with the Borexino counting test facility (CTF). One candidate event survived after rejection of background, which included muon-induced neutrons and random coincidences. An upper limit on the solar ν̄e flux, assumed having the 8B solar neutrino energy spectrum, of 1.1×105 cm-2 s-1 (90% C.L.) was set with a 7.8 ton × year exposure. This upper limit corresponds to a solar neutrino transition probability, νe→ν̄e, of 0.02 (90% C.L.). Predictions for antineutrino detection with Borexino, including geoneutrinos, are discussed on the basis of background measurements performed with the CTF.

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PACS

13.15.+g, 14.60.St, 13.40.Em, 96.60.Hv, 96.60.qd, 23.40.Bw

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The Borexino Collaboration. Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso. Eur. Phys. J. C 47, 21–30 (2006). https://doi.org/10.1140/epjc/s2006-02560-4

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  • DOI: https://doi.org/10.1140/epjc/s2006-02560-4

Keywords

  • Solar Neutrino
  • Liquid Scintillator
  • Candidate Event
  • Coincidence Time
  • Electron Antineutrino