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.
Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso / M. Balata, G. Bellini, J. Benziger, S. Bonetti, B. Caccianiga, F. Calaprice, D. D’Angelo, A. de Bellefon, H. de Kerret, A. Derbin, A. Etenko, R. Ford , D. Franco, C. Galbiati, S. Gazzana, M. Giammarchi, A. Goretti, E. Harding, G. Heusser, A. Ianni, A.M. Ianni, V.V. Kobychev, G. Korga, Y. Kozlov, D. Kryn, M. Laubenstein , C. Lendvai, M. Leung, E. Litvinovich, P.Lombardi, I. Machulin, D. Manuzio, G. Manuzio, F. Masetti, U. Mazzucato, K. McCarty, E. Meroni, L. Miramonti, M.E. Monzani, V. Muratova, L. Niedermeier, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, A. Pocar, R.S. Raghavan, G. Ranucci, A. Razeto, A. Sabelnikov, C. Salvo, S. Schoenert, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sotnikov, S. Sukhotin, Y. Suvorov, V. Tarasenkov, R. Tartaglia, G. Testera, D. Vignaud, R.B. Vogelaar, F. Von Feilitzsch, V. Vyrodov, M. Wojcik, O. Zaimidoroga, G. Zuzel. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 47:1(2006), pp. 21-30. [10.1140/epjc/s2006-02560-4]
Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso
G. BelliniSecondo
;S. Bonetti;B. Caccianiga;D. D’Angelo;D. Franco;E. Meroni;L. Miramonti;
2006
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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