We report on an improved measurement of the B-8 solar neutrino interaction rate with the Borexino experiment at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large volume of liquid scintillator. The measured rate of scattered electrons above 3 MeV of energy is 0.223(-0.016)(+0.015) (stat) (+0.006)(-0.006) (syst) cpd/100 t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of Phi(ES)(8B) = 2.57(-0.18)(+0.17) (stat) (+0.07)(-0.07) (syst) x 10(6) cm(-2) s(-1). This measurement exploits the active volume of the detector in almost its entirety for the first time, and takes advantage of a reduced radioactive background following the 2011 scintillator purification campaign and of novel analysis tools providing a more precise modeling of the background. Additionally, we set a new limit on the interaction rate of solar hep neutrinos, searched via their elastic scattering on electrons as well as their neutral current-mediated inelastic scattering on carbon, C-12(nu, nu')C-12* (E-gamma = 15.1 MeV).
Improved measurement of B8 solar neutrinos with 1.5 kt·y of Borexino exposure / M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, D. Bick, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, P. Cavalcante, A. Chepurnov, D. D’Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X. . Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, A. Formozov, D. Franco, C. Galbiati, M. Gschwender, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, C. Hagner, T. Houdy, E. Hungerford, A. Ianni, A. Ianni, A. Jany, D. Jeschke, V. Kobychev, G. Korga, S. Kumaran, T. Lachenmaier, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, S. Marcocci, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. . Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Rottenanger, S. Schönert, D. Semenov, M. Skorokhvatov, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. . Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, K. Zuber, G. Zuzel. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 101:6(2020 Mar), pp. 062001.1-062001.14.
Improved measurement of B8 solar neutrinos with 1.5 kt·y of Borexino exposure
D. Basilico;G. Bellini;D. D’Angelo;A. Formozov;M. Giammarchi;E. Meroni;L. Miramonti;A. Re;
2020
Abstract
We report on an improved measurement of the B-8 solar neutrino interaction rate with the Borexino experiment at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large volume of liquid scintillator. The measured rate of scattered electrons above 3 MeV of energy is 0.223(-0.016)(+0.015) (stat) (+0.006)(-0.006) (syst) cpd/100 t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of Phi(ES)(8B) = 2.57(-0.18)(+0.17) (stat) (+0.07)(-0.07) (syst) x 10(6) cm(-2) s(-1). This measurement exploits the active volume of the detector in almost its entirety for the first time, and takes advantage of a reduced radioactive background following the 2011 scintillator purification campaign and of novel analysis tools providing a more precise modeling of the background. Additionally, we set a new limit on the interaction rate of solar hep neutrinos, searched via their elastic scattering on electrons as well as their neutral current-mediated inelastic scattering on carbon, C-12(nu, nu')C-12* (E-gamma = 15.1 MeV).
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