Direct measurement of the 7Be solar neutrino flux with 192 days of borexino data.

  title={Direct measurement of the 7Be solar neutrino flux with 192 days of borexino data.},
  author={Cristina Arpesella and Henning Olling Back and M Balata and Gianpaolo Bellini and Jay B. Benziger and Stefano Bonetti and A. Brigatti and Barbara Caccianiga and Laura Cadonati and Frank P. Calaprice and Carlo Carraro and G. Cecchet and Alvaro E. Chavarria and M. C. Chen and F. Dalnoki-Veress and D. D’Angelo and A. de Bari and A de Bellefon and H. de Kerret and Alexander Derbin and M Deutsch and A. di Credico and Gianfranco Di Pietro and Robert A. Eisenstein and Fausto Elisei and A. V. {\'E}tenko and Robert Fernholz and Kirill Fomenko and R Ford and D. Franco and B. Freudiger and Cristiano Galbiati and Flavio Gatti and S. Gazzana and Marco Giammarchi and Danilo Giugni and Marianne Goeger-Neff and Thomas Goldbrunner and Augusto Goretti and Christian Grieb and Caren Hagner and Wolfgang Hampel and Eric C. Harding and Steve Hardy and F. X. Hartman and Theo Hertrich and Gerd Heusser and Aldo Ianni and Andrea Ianni and Malcolm J. Joyce and J. Kiko and Till A. Kirsten and V. V. Kobychev and George Korga and G. Korschinek and D. Kryn and Vittorio Lagomarsino and P. H. Lamarche and Matthias Laubenstein and Christian Lendvai and M. Leung and Timo Lewke and Evgeny Litvinovich and B. Loer and Paolo Lombardi and Livia Ludhova and I. N. Machulin and Sandra Malvezzi and Szymon Manecki and Jos{\'e} Maneira and W. Maneschg and Istv{\'a}n Manno and D. Manuzio and Giulio Manuzio and A. Martemianov and Fausto Masetti and Ugo Mazzucato and Kevin McCarty and D. N. Mckinsey and Q. Meindl and Emanuela Meroni and Lino Miramonti and M. Misiaszek and Davide Montanari and M. E. Monzani and Viktorina N. Muratova and Paolo Musico and H. Neder and Andrew Nelson and Ludwig Niedermeier and Lothar Oberauer and Michel Obolensky and Massimo Orsini and Fausto Ortica and Marco Pallavicini and L{\'a}szl{\'o} Papp and Sergio Parmeggiano and Laura Perasso and Andrea Pocar and R. S. Raghavan and G. Ranucci and Wolfgang Rau and Alessandro Razeto and Elisa Resconi and P. Risso and Aldo Romani and Derek Rountree and A. A. Sabelnikov and R. Saldanha and C. Araya Salvo and D. Schimizzi and Stefan Sch{\"o}nert and Thomas Alan Shutt and H. Simgen and Mikhail Skorokhvatov and O. Yu. Smirnov and A. H. Sonnenschein and Albert Sotnikov and S. V. Sukhotin and Yura Suvorov and Roberto Tartaglia and Gemma Testera and Daniel Vignaud and Stefano Vitale and Robert Bruce Vogelaar and Franz von Feilitzsch and Roger von Hentig and T von Hentig and Mariusz W{\'o}jcik and Michael Wurm and Oleg Antonovich Zaimidoroga and S Zavatarelli and Grzegorz Zuzel},
  journal={Physical review letters},
  volume={101 9},
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+/-3stat+/-4syst counts/(day.100 ton). The hypothesis of no oscillation for 7Be solar neutrinos is inconsistent with our measurement at the 4sigma C.L. Our result is the first direct measurement of the survival probability for solar nu(e) in the transition region between matter-enhanced… 

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