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 ($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 ${\bar{\nu }}_e$ flux, assumed having the ${}^8$B solar neutrino energy spectrum, of 1.1$\times 10^5$ 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, ${\nu }_e\to {\bar{\nu }}_e$, 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.

10 pages, 9 figures, 5 tables

Cited by in corpus (4)

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