First Evidence of pep Solar Neutrinos by Direct Detection in Borexino
- Bellini, G.
- Benziger, J.
- Bick, D.
- Bonetti, S.
- Bonfini, G.
- Bravo, D.
- Buizza Avanzini, M.
- Caccianiga, B.
- Cadonati, L.
- Calaprice, F.
- Carraro, C.
- Cavalcante, P.
- Chavarria, A.
- Chepurnov, A.
- d'Angelo, D.
- Davini, S.
- Derbin, A.
- Etenko, A.
- Fomenko, K.
- Franco, D.
- Galbiati, C.
- Gazzana, S.
- Ghiano, C.
- Giammarchi, M.
- Goeger-Neff, M.
- Goretti, A.
- Grandi, L.
- Guardincerri, E.
- Hardy, S.
- Ianni, Aldo
- Ianni, Andrea
- Korablev, D.
- Korga, G.
- Koshio, Y.
- Kryn, D.
- Laubenstein, M.
- Lewke, T.
- Litvinovich, E.
- Loer, B.
- Lombardi, F.
- Lombardi, P.
- Ludhova, L.
- Machulin, I.
- Manecki, S.
- Maneschg, W.
- Manuzio, G.
- Meindl, Q.
- Meroni, E.
- Miramonti, L.
- Misiaszek, M.
- Montanari, D.
- Mosteiro, P.
- Muratova, V.
- Oberauer, L.
- Obolensky, M.
- Ortica, F.
- Otis, K.
- Pallavicini, M.
- Papp, L.
- Perasso, L.
- Perasso, S.
- Pocar, A.
- Quirk, J.
- Raghavan, R. S.
- Ranucci, G.
- Razeto, A.
- Re, A.
- Romani, A.
- Sabelnikov, A.
- Saldanha, R.
- Salvo, C.
- Schönert, S.
- Simgen, H.
- Skorokhvatov, M.
- Smirnov, O.
- Sotnikov, A.
- Sukhotin, S.
- Suvorov, Y.
- Tartaglia, R.
- Testera, G.
- Vignaud, D.
- Vogelaar, R. B.
- von Feilitzsch, F.
- Winter, J.
- Wojcik, M.
- Wright, A.
- Wurm, M.
- Xu, J.
- Zaimidoroga, O.
- Zavatarelli, S.
- Zuzel, G.
DOIAbstract
We observed, for the first time, solar neutrinos in the 1.0-1.5 MeV energy range. We determined the rate of pep solar neutrino interactions in Borexino to be 3.1±0.6stat±0.3systcounts/(day*100ton). Assuming the pep neutrino flux predicted by the standard solar model, we obtained a constraint on the CNO solar neutrino interaction rate of <7.9counts/(day*100ton) (95% C.L.). The absence of the solar neutrino signal is disfavored at 99.97% C.L., while the absence of the pep signal is disfavored at 98% C.L. The necessary sensitivity was achieved by adopting data analysis techniques for the rejection of cosmogenic C11, the dominant background in the 1-2 MeV region. Assuming the Mikheyev-Smirnov-Wolfenstein large mixing angle solution to solar neu...
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