First real time detection of 7Be solar neutrinos by Borexino

C. Arpesella, G. Bellini, J. Benziger, S. Bonetti, B. Caccianiga, F. Calaprice, F. Dalnoki-Veress, D. D'Angelo, H. de Kerret, A. Derbin, M. Deutsch, A. Etenko, K. Fomenko, R. Ford, D. Franco, B. Freudiger, C. Galbiati, S. Gazzana, M. Giammarchi, M. Goeger-NeffA. Goretti, C. Grieb, S. Hardy, G. Heusser, Aldo Ianni, Andrea Ianni, M. Joyce, G. Korga, D. Kryn, M. Laubenstein, M. Leung, E. Litvinovich, P. Lombardi, L. Ludhova, I. Machulin, G. Manuzio, A. Martemianov, F. Masetti, K. McCarty, E. Meroni, L. Miramonti, M. Misiaszek, D. Montanari, 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. Schönert, H. Simgen, O. Smirnov, M. Skorokhvatov, A. Sonnenschein, A. Sotnikov, S. Sukhotin, Y. Suvorov, V. Tarasenkov, R. Tartaglia, G. Testera, D. Vignaud, S. Vitale, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, O. Zaimidoroga, S. Zavatarelli, G. Zuzel

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239 Scopus citations


This Letter reports a direct measurement of the 7Be solar neutrino signal rate performed with the Borexino low background liquid scintillator detector at the Laboratori Nazionali del Gran Sasso. This is the first real-time spectral measurement of sub-MeV solar neutrinos. The result for 0.862 MeV 7Be neutrinos is 47 ± 7stat ± 12sys counts/(day ṡ 100 ton), consistent with predictions of Standard Solar Models and neutrino oscillations with LMA-MSW parameters.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
StatePublished - 3 Jan 2008
Externally publishedYes

Bibliographical note

Funding Information:
We sincerely thank the funding agencies: INFN (Italy), NSF (USA), BMBF, DFG and MPG (Germany), Rosnauka (Russia) and we acknowledge the generous support of the Laboratori Nazionali del Gran Sasso. We gratefully acknowledge the valuable contribution from former collaborators. This Letter is dedicated to the memory of Cristina Arpesella, Martin Deutsch, Burkhard Freudiger, Andrei Martemianov and Sandro Vitale, and to John Bahcall, a friend and strong supporter of Borexino.


  • Liquid scintillators
  • Low background detectors
  • Neutrino oscillations
  • Solar neutrinos


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