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

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

2006-02-10

arxiv.org/abs/hep-ex/0602027v2

Eur.Phys.J.C47:21-30,2006

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 9 figures, 5 tables

Scientific paper

10.1140/epjc/s2006-02560-4

Electron antineutrino interactions above the inverse beta decay energy of protons ($E_\bar{\nu}_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$\times10^{5}$ 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, $\nu_{e} \to \bar{\nu}_{e}$, 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.

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