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

Borexino collaboration·M. Balata
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Abstract

Electron antineutrino interactions above the inverse beta decay energy of protons ($E_\barν_e>$1.8) where 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 $\barν_{e}$ flux, assumed having the $^8$B solar neutrino energy spectrum, of 1.1$\times10^{5}$ cm$^{-2}$~s$^{-1}$ (90% C.L.) was set with a 7.8 ton $\times$ year exposure. This upper limit corresponds to a solar neutrino transition probability, $ν_{e} \to \barν_{e}$, 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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Borexino collaboration, M. Balata. 2006-05-10. Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso. https://doi.org/10.1140/epjc%2Fs2006-02560-4

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