/ hep-ex arXiv:1709.00756


Improved measurement of 8B solar neutrinos with 1.5 kt y of Borexino exposure


Agostini, M. (GSSI, Aquila) ; Altenmüller, K. (Munich, Tech. U.) ; Appel, S. (Munich, Tech. U.) ; Atroshchenko, V. (Kurchatov Inst., Moscow) ; Bagdasarian, Z. (Julich, Forschungszentrum) ; Basilico, D. (Milan U.) ; Bellini, G. (Milan U.) ; Benziger, J. (Princeton U., Chem. Eng. Dept.) ; Bick, D. (Hamburg U.) ; Bonfini, G. (Gran Sasso) ; Bravo, D. (Virginia Tech.) ; Caccianiga, B. (Milan U.) ; Calaprice, F. (Princeton U.) ; Caminata, A. (INFN, Genoa) ; Caprioli, S. (Milan U.) ; Carlini, M. (Gran Sasso) ; Cavalcante, P. (Gran Sasso) ; Chepurnov, A. (SINP, Moscow) ; Choi, K. (Hawaii U.) ; Collica, L. (Milan U.) ; D'Angelo, D. (Milan U.) ; Davini, S. (INFN, Genoa) ; Derbin, A. (St. Petersburg, INP) ; Ding, X.F. (GSSI, Aquila) ; Di Ludovico, A. (Princeton U.) ; Di Noto, L. (INFN, Genoa) ; Drachnev, I. (INFN, Trieste) ; Fomenko, K. (Dubna, JINR) ; Formozov, A. (Dubna, JINR) ; Franco, D. (APC, Paris) ; Gabriele, F. (Gran Sasso) ; Galbiati, C. (Princeton U.) ; Ghiano, C. (Gran Sasso) ; Giammarchi, M. (Milan U.) ; Goretti, A. (Princeton U.) ; Gromov, M. (SINP, Moscow) ; Guffanti, D. (GSSI, Aquila) ; Hagner, C. (Hamburg U.) ; Houdy, T. (APC, Paris) ; Hungerford, E. (Houston U.) ; Aldo Ianni\affiliation{INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy (Gran Sasso) ; Ianni, Andrea (Princeton U.) ; Jany, A. (Jagiellonian U.) ; Jeschke, D. (Munich, Tech. U.) ; Kobychev, V. (Kiev, INR) ; Korablev, D. (Dubna, JINR) ; Korga, G. (Houston U.) ; Kryn, D. (APC, Paris) ; Laubenstein, M. (Gran Sasso) ; Litvinovich, E. (Kurchatov Inst., Moscow) ; F.Lombardi\affiliation{INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy (Gran Sasso) ; Lombardi, P. (Milan U.) ; Ludhova, L. (RWTH Aachen U.) ; Lukyanchenko, G. (Kurchatov Inst., Moscow) ; Lukyanchenko, L. (Kurchatov Inst., Moscow) ; Machulin, I. (Kurchatov Inst., Moscow) ; Manuzio, G. (INFN, Genoa) ; Marcocci, S. (INFN, Trieste) ; Martyn, J. (U. Mainz, PRISMA) ; Meroni, E. (Milan U.) ; Meyer, M. (Dresden, Tech. U., ITP) ; Miramonti, L. (Milan U.) ; Misiaszek, M. (Jagiellonian U.) ; Muratova, V. (St. Petersburg, INP) ; Neumair, B. (Munich, Tech. U.) ; Oberauer, L. (Munich, Tech. U.) ; Opitz, B. (Hamburg U.) ; Orekhov, V. (Kurchatov Inst., Moscow) ; Ortica, F. (Perugia U.) ; Pallavicini, M. (INFN, Genoa) ; Papp, L. (Munich, Tech. U.) ; Penek, Ö. (RWTH Aachen U.) ; Pilipenko, N. (St. Petersburg, INP) ; Pocar, A. (Massachusetts U., Amherst) ; Porcelli, A. (U. Mainz, PRISMA) ; Ranucci, G. (Milan U.) ; Razeto, A. (Gran Sasso) ; Re, A. (Milan U.) ; Redchuk, M. (RWTH Aachen U.) ; Romani, A. (Perugia U.) ; Roncin, R. (Gran Sasso) ; Rossi, N. (Gran Sasso) ; Schönert, S. (Munich, Tech. U.) ; Semenov, D. (St. Petersburg, INP) ; Skorokhvatov, M. (Kurchatov Inst., Moscow) ; Smirnov, O. (Dubna, JINR) ; Sotnikov, A. (Dubna, JINR) ; Stokes, L.F.F. (Gran Sasso) ; Suvorov, Y. (UCLA) ; Tartaglia, R. (Gran Sasso) ; Testera, G. (INFN, Genoa) ; Thurn, J. (Dresden, Tech. U., ITP) ; Toropova, M. (Kurchatov Inst., Moscow) ; Unzhakov, E. (St. Petersburg, INP) ; Vishneva, A. (Dubna, JINR) ; Vogelaar, R.B. (Virginia Tech.) ; von Feilitzsch, F. (Munich, Tech. U.) ; Wang, H. (UCLA) ; Weinz, S. (U. Mainz, PRISMA) ; Wojcik, M. (Jagiellonian U.) ; Wurm, M. (U. Mainz, PRISMA) ; Yokley, Z. (Virginia Tech.) ; Zaimidoroga, O. (Dubna, JINR) ; Zavatarelli, S. (INFN, Genoa) ; Zuber, K. (Dresden, Tech. U., ITP) ; Zuzel, G. (Jagiellonian U.)

Pages: 13

Abstract: We report on an improved measurement of the $^8$B solar neutrino interaction rate with the Borexino detector at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large, radio-pure liquid scintillator target. Novel analysis approaches exploiting most of the active volume of the detector have enabled the collection of data from 1.5 kt$\cdot$y exposure between 2008 and 2016. The measured rate of solar neutrino-induced, scattered electrons above 3 MeV of energy is $0.220\substack{+0.015 \\ -0.016}\,(stat)\,\substack{+0.006 \\ -0.006}\,(syst)$~cpd/100~t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of 2.55$\substack{+0.17 \\ -0.19}(stat)\substack{+0.07\\ -0.07}(syst)\times$10$^6$~cm$^{-2}\,$s$^{-1}$. If one assumes the $^8$B solar neutrino flux predicted by the high metallicity Standard Solar Model, the average $^8$B solar $\nu_e$ survival probability is 0.36$\pm$0.08 at the mean visible energy of 7.9~MeV, in good agreement with the MSW-LMA

Web-Page: http://inspirehep.net/record/1621429/files/fig_map.png; http://inspirehep.net/record/1621429/files/fig_intshapes.png; http://inspirehep.net/record/1621429/files/fig_radialfitHE.png; http://inspirehep.net/record/1621429/files/fig_radialfitLE.png; http://inspirehep.net/record/1621429/files/fig_energy.png; http://inspirehep.net/record/1621429/files/fig_externals.png; http://inspirehep.net/record/1621429/files/fig_neutrons.png; http://inspirehep.net/record/1621429/files/fig_peeLZ.png; http://inspirehep.net/record/1621429/files/fig_peeHZ.png; http://inspirehep.net/record/1621429/files/fig_thresholds.png; http://inspirehep.net/record/1621429/files/fig_bi212.png; http://inspirehep.net/record/1621429/files/fig_neutrinos.png; http://inspirehep.net/record/1621429/files/fig_tl208radial.png; http://inspirehep.net/record/1621429/files/fig_extshapes.png; http://inspirehep.net/record/1621429/files/arXiv:1709.00756.pdf


Note: *Temporary entry*; 13 pages, 14 figures, 4 tables

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