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Direct Measurement of the ^7Be Solar Neutrino Flux with 192 Days of Borexino Data

Arpesella, C. / Back, H.O. / Balata, M. / Bellini, G. / Benziger, J. / Bonetti, S. / Brigatti, A. / Caccianiga, B. / Cadonati, L. / Calaprice, F. / Carraro, C. / Cecchet, G. / Chavarria, A. / Chen, M. / Dalnoki-Veress, F. / D'Angelo, D. / De Bari, A. / De Bellefon, A. / De Kerret, H. / Derbin, A. / Deutsch, M. / Di Credico, A. / Di Pietro, G. / Eisenstein, R. / Elisei, F. / Etenko, A. / Fernholz, R. / Fomenko, K. / Ford, R. / Franco, D. / Freudiger, B. / Galbiati, C. / Gatti, F. / Gazzana, S. / Giammarchi, M. / Giugni, D. / Goeger-Neff, M. / Goldbrunner, T. / Goretti, D.A. / Grieb, C. / Hagner, C. / Hampel, W. / Harding, E. / Hardy, S. / Hartman, F.X. / Hertrich, T. / Heusser, G. / Ianni, Aldo / Ianni, Andrea / Joyce, M. / Kiko, J. / Kirsten, T. / Kobychev, V. / Korga, G. / Korschinek, G. / Kryn, D. / Lagomarsino, V. / LaMarche, P. / Laubenstein, M. / Lendvai, C. / Leung, M. / Lewke, T. / Litvinovich, E. / Loer, B. / Lombardi, P. / Ludhova, L. / Machulin, I. / Malvezzi, S. / Manecki, S. / Maneira, J. / W. Maneschg, H. / Manno, I. / Manuzio, D. / G. Manuzio, I. / Martemianov, A. / Masetti, F. / Mazzucato, U. / McCarty, K. / Mckinsey, D. / Meindl, Q. / Meroni, E. / Miramonti, L. / Misiaszek, M. / Montanari, D. / Monzani, M.E. / Muratova, V. / Musico, P. / Neder, H. / Nelson, A. / Niedermeier, L. / Oberauer, L. / Obolensky, M. / Orsini, M. / Ortica, F. / Pallavicini, M. / Papp, L. / Parmeggiano, S. / Perasso, L. / Pocar, A. / Raghavan, R.S. / Ranucci, G. / Rau, W. / Razeto, A. / Resconi, E. / Risso, P. / Romani, A. / Rountree, D. / Sabelnikov, A. / Saldanha, R., / Salvo, C. / Schimizzi, D. / Schonert, S. / Shutt, T. / Simgen, H. / Skorokhvatov, M. / Smirnov, O. / Sonnenschein, A. / Sotnikov, A. / Sukhotin, S. / Suvorov, Y. / Tartaglia, R. / Testera, G. / Vignaud, D. / Vitale, S. / Vogelaar, R.B. / Von Feilitzsch, F. / Von Hentig, R. / Von Hentig, T. / Wojcik, M. / Wurm, M. / Zaimidoroga, O. / Zavatarelli, S. / Zuzel, G. - 2015
We report the direct measurement of the ^7Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV ^7Be neutrinos is 49+-3(stat)+-4(syst) counts/(day * 100ton). The hypothesis of no oscillation for ^7Be solar neutrinos is inconsistent with our measurement at the 4sigma level. Our result is the first direct measurement of the survival probability for solar nu_e in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of ^7Be, pp, and CNO solar nu_e, and the limit on the magnetic moment of neutrinos.

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