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Direct measurement of the Be7 solar neutrino flux with 192 days of Borexino bata

  • 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
  • , H. De Kerret
  • , 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, 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, 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, W. Maneschg, I. Manno, D. Manuzio, 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, 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. Schönert, T. Shutt, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sonnenschein, A. Sotnikov, S. Sukhotin, Y. Suvorov, R. Tartaglia, G. Testera, D. Vignaud, S. Vitale, R. B. Vogelaar, F. Von Feilitzsch, R. Von Hentig, T. Von Hentig, M. Wojcik, M. Wurm, O. Zaimidoroga, S. Zavatarelli, G. Zuzel
  • Laboratori Nazionali del Gran Sasso
  • University of Milan
  • North Carolina State University
  • Department of Chemical Engineering
  • University of Massachusetts Amherst
  • Princeton University
  • Istituto Nazionale per la Fisica della Materia
  • Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
  • Queen's University
  • Université Paris Diderot
  • Petersburg Nuclear Phys. Inst.
  • Massachusetts Institute of Technology
  • INFN Sezione di Perugia
  • National Research Centre "Kurchatov Institute"
  • Joint Inst. for Nuclear Research
  • SNOLab
  • Max-Planck-Institut für Kernphysik
  • Technical University of Munich
  • Booz Allen Hamilton, Inc.
  • European Patent Office
  • Universität Hamburg
  • Lockheed Martin Space Systems Company
  • Virginia Polytechnic Institute and State University
  • Institute for Nuclear Research
  • Laboratório de Instrumentacão e Física Experimental de Partícula
  • Wigner Research Centre for Physics
  • Carestream Health, Inc.
  • Yale University
  • Jagiellonian University
  • Stanford University
  • Case Western Reserve University
  • Fermi National Accelerator Laboratory

Research output: Contribution to journalArticlepeer-review

440 Scopus citations

Abstract

We report the direct measurement of the Be7 solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862MeV Be7 neutrinos is 49±3stat± 4systcounts/(day•100ton). The hypothesis of no oscillation for Be7 solar neutrinos is inconsistent with our measurement at the 4σ C.L. Our result is the first direct measurement of the survival probability for solar νe in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of Be7, pp, and CNO solar νe, and the limit on the effective neutrino magnetic moment using solar neutrinos.

Original languageEnglish
Article number091302
JournalPhysical Review Letters
Volume101
Issue number9
DOIs
StatePublished - 29 Aug 2008

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