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First evidence of pep solar neutrinos by direct detection in Borexino

Author(s): Galbiati, C; Bellini, G; Benziger, J; Bick, D; Bonetti, S; et al

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Abstract: 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±0.3syst counts/(day·100 ton). Assuming the pep neutrino flux predicted by the Standard Solar Model, we obtained a constraint on the CNO solar neutrino interaction rate of <7.9 counts/(day·100 ton) (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 11C, the dominant background in the 1–2 MeV region. Assuming the MSW-LMA solution to solar neutrino oscillations, these values correspond to solar neutrino fluxes of (1.6±0.3)×108 cm−2 s−1 and <7.7×108 cm−2 s−1 (95% C.L.), respectively, in agreement with both the High and Low Metallicity Standard Solar Models. These results represent the first direct evidence of the pep neutrino signal and the strongest constraint of the CNO solar neutrino flux to date.
Publication Date: 30-Jul-2012
Electronic Publication Date: 30-Jul-2012
Citation: Galbiati, C, Bellini, G, Benziger, J, Bick, D, Bonetti, S, Bonfini, G, Bravo, D, Avanzini, M Buizza, Caccianiga, B, Cadonati, L, Calaprice, F, Carraro, C, Cavalcante, P, Chavarria, A, DAngelo, D, Davini, S, Derbin, A, Etenko, A, Fomenko, K, Franco, D, Galbiati, C, Gazzana, S, Ghiano, C, Giammarchi, M, Neff, M Goeger-, 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, RS, 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, RB, von Feilitzsch, F, Winter, J, Wojcik, M, Wright, A, Wurm, M, Xu, J, Zaimidoroga, O, Zavatarelli, S, Zuzel, G. (2012). First evidence of pep solar neutrinos by direct detection in Borexino. Journal of Physics: Conference Series, 375 (4), 042030 - 042030. doi:10.1088/1742-6596/375/1/042030
DOI: doi:10.1088/1742-6596/375/1/042030
EISSN: 1742-6596
Pages: 042030 -
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Physics: Conference Series
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.



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