Precision Measurement of theBe7Solar Neutrino Interaction Rate in Borexino

• DOI: 10.1103/physrevlett.107.141302
• Publication Date: 2011-09-30T18:01:57Z
• Authors: G. Bellini; J. Benziger; D. Bick; S. Bonetti; G. Bonfini; M. Buizza Avanzini; B. Caccianiga; L. Cadonati; F. Calaprice; C. Carraro; P. Cavalcante; A. Chavarria; D. D’Angelo; S. Davini; A. Derbin; A. Etenko; K. Fomenko; D. Franco; C. Galbiati; S. Gazzana; C. Ghiano; M. Giammarchi; M. Goeger-Neff; A. Goretti; L. Grandi; E. Guardincerri; S. Hardy; Aldo Ianni; Andrea Ianni; V. Kobychev; D. Korablev; G. Korga; Y. Koshio; D. Kryn; M. Laubenstein; T. Lewke; E. Litvinovich; B. Loer; F. Lombardi; P. Lombardi; L. Ludhova; I. Machulin; S. Manecki; W. Maneschg; G. Manuzio; Q. Meindl; E. Meroni; L. Miramonti; M. Misiaszek; D. Montanari; P. Mosteiro; V. Muratova; L. Oberauer; M. Obolensky; F. Ortica; M. Pallavicini; L. Papp; C. Peña-Garay; L. Perasso; S. Perasso; A. Pocar; R. S. Raghavan; G. Ranucci; A. Razeto; A. Re; A. Romani; A. Sabelnikov; R. Saldanha; C. Salvo; S. Schönert; H. Simgen; M. Skorokhvatov; O. Smirnov; A. Sotnikov; S. Sukhotin; Y. Suvorov; R. Tartaglia; G. Testera; D. Vignaud; R. B. Vogelaar; F. von Feilitzsch; J. Winter; M. Wojcik; A. Wright; M. Wurm; J. Xu; O. Zaimidoroga; S. Zavatarelli; G. Zuzel
• Keywords: Borexino; Oscillation (cell signaling)

A direct measurement of the 0.862 MeV 7Be solar neutrino interaction rate performed with Borexino detector at Laboratori Nazionali del Gran Sasso yields 46.0$\pm1.5_{\rm stat}$$^{+1.6}_{-1.5\,\rm syst}$ counts/day/(100 tons). Our result is first a sub-MeV an accuracy better than 5%. The hypothesis no oscillation for neutrinos rejected 4.9$\sigma$ C.L. Using latest Standard Solar Model (SSM) flux predictions, leads directly to precise determination survival probability $\nu_e$'s in vacuum, and permits us probe unprecedented sensitivity transition between matter-enhanced vacuum-dominated regimes characteristic MSW-LMA solution problem.