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Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran SassoBalata, M.; Bellini, G.; Benziger, J.; Bonetti, S.; Caccianiga, B.; Calaprice, F.; d'Angelo, D.; de Bellefon, A.; de Kerret, H.; Derbin, A.; Etenko, A.; Ford, R.; Franco, D.; Galbiati, C.; Gazzana, S.; Giammarchi, M.; Goretti, A.; Harding, E.; Heusser, G.; Ianni, A.; M. Ianni, A.; Kobychev, V.V.; Korga, G.; Kozlov, Y.; Kryn, D.; Laubenstein, M.; Lendvai, C.; Leung, M.; Litvinovich, E.; Lombardi, P.; Machulin, I.; Manuzio, D.; Manuzio, G.; Masetti, F.; Mazzucato, U.; Mccarty, K.; Meroni, E.; Miramonti, L.; E. Monzani, M.; Muratova, V.; Niedermeier, L.; Oberauer, L.; Obolensky, M.; Ortica, F.; Pallavicini, M.; Papp, L.; Perasso, L.; Pocar, A.; Raghavan, R.S.; Ranucci, G.; Razeto, A.; Sabelnikov, A.; Salvo, C.; Schoenert, S.; Simgen, H.; Skorokhvatov, M.; Smirnov, O.; Sotnikov, A.; Sukhotin, S.; Suvorov, Y.; Tarasenkov, V.; Tartaglia, R.; Testera, G.; Vignaud, D.; Vogelaar, R.B.; von Feilitzsch, F.; Vyrodov, V.; Wojcik, M.; Zaimidoroga, O.; Zuzel, G.
The European physical journal. C, Particles and fields, 07/2006, Letnik: 47, Številka: 1Journal Article
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.
