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

C. Arpesella H.O. Back M. Balata G. Bellini J. Benziger S. Bonetti A. Brigatti B. Caccianiga L. Cadonati F. Calaprice C. Carraro G. Cecchet A. Chavarria M. Chen F. Dalnoki-Veress D. d'Angelo A. de Bari A. de Bellefon 1 H. de Kerret 2 A. Derbin M. Deutsch A. Di Credico G. Di Pietro R. Eisenstein F. Elisei A. Etenko R. Fernholz K. Fomenko R. Ford D. Franco B. Freudiger C. Galbiati F. Gatti S. Gazzana M. Giammarchi D. Giugni M. Goeger-Neff T. Goldbrunner D.A. Goretti C. Grieb C. Hagner W. Hampel E. Harding S. Hardy F.X. Hartman T. Hertrich G. Heusser Aldo Ianni Andrea Ianni M. Joyce J. Kiko T. Kirsten V. Kobychev G. Korga G. Korschinek D. Kryn 2 V. Lagomarsino P. Lamarche M. Laubenstein C. Lendvai M. Leung T. Lewke E. Litvinovich B. Loer P. Lombardi L. Ludhova I. Machulin S. Malvezzi S. Manecki J. Maneira H. W. Maneschg I. Manno D. Manuzio I. G. Manuzio A. Martemianov F. Masetti U. Mazzucato K. Mccarty D. Mckinsey Q. Meindl E. Meroni L. Miramonti M. Misiaszek D. Montanari M.E. Monzani V. Muratova P. Musico H. Neder A. Nelson L. Niedermeier L. Oberauer M. Obolensky 1 M. Orsini F. Ortica M. Pallavicini L. Papp S. Parmeggiano L. Perasso A. Pocar R.S. Raghavan G. Ranucci W. Rau A. Razeto E. Resconi P. Risso A. Romani D. Rountree A. Sabelnikov R. Saldanha C. Salvo D. Schimizzi S. Schonert T. Shutt H. Simgen M. Skorokhvatov O. Smirnov A. Sonnenschein A. Sotnikov S. Sukhotin Y. Suvorov R. Tartaglia G. Testera D. Vignaud 2 S. Vitale R.B. Vogelaar F. von Feilitzsch R. von Hentig T. von Hentig M. Wojcik M. Wurm O. Zaimidoroga S. Zavatarelli G. Zuzel
2 APC - Neutrinos
LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies, APC (UMR_7164) - AstroParticule et Cosmologie
Abstract : 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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Submitted on : Tuesday, September 9, 2008 - 11:55:17 AM
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C. Arpesella, H.O. Back, M. Balata, G. Bellini, J. Benziger, et al.. Direct Measurement of the ^7Be Solar Neutrino Flux with 192 Days of Borexino Data. Physical Review Letters, American Physical Society, 2008, 101, pp.091302. ⟨10.1103/PhysRevLett.101.091302⟩. ⟨in2p3-00319756⟩

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