Electron energy spectra, fluxes, and day-night asymmetries of boron-8 solar neutrinos from the 391-day salt phase sno data set
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Electron energy spectra, fluxes, and day-night asymmetries of boron-8 solar neutrinos from the 391-day salt phase sno data set

  • Author(s): Aharmim, B.
  • Ahmed, S.N.
  • Anthony, A.E.
  • Beier, E.W.
  • Bellerive, A.
  • Bergevin, M.
  • Biller, S.D.
  • Boger, J.
  • Boulay, M.G.
  • Bowler, M.G.
  • Bullard, T.V.
  • Chan, Y.D.
  • Chen, M.
  • Chen, X.
  • Cleveland, B.T.
  • Cox, G.A.
  • Currat, C.A.
  • Dai, X.
  • Dalnoki-Veress, F.
  • Deng, H.
  • Doe, P.J.
  • Dosanjh, R.S.
  • Doucas, G.
  • Duba, C.A.
  • Duncan, F.A.
  • Dunford, M.
  • Dunmore, J.A.
  • Earle, E.D.
  • Elliott, S.R.
  • Evans, H.C.
  • Ewan, G.T.
  • Farine, J.
  • Fergani, H.
  • Fleurot, F.
  • Formaggio, J.A.
  • Frame, K.
  • Frati, W.
  • Fulsom, B.G.
  • Gagnon, N.
  • Graham, K.
  • Grant, D.R.
  • Hahn, R.L.
  • Hall, J.C.
  • Hallin, A.L.
  • Hallman, E.D.
  • Handler, W.B.
  • Hargrove, C.K.
  • Harvey, P.J.
  • Hazama, R.
  • Heeger, K.M.
  • Heelan, L.
  • Heintzelman, W.J.
  • Heise, J.
  • Helmer, R.L.
  • Hemingway, R.J.
  • Hime, A.
  • Howard, C.
  • Howe, M.A.
  • Huang, M.
  • Jagam, P.
  • Jelley, N.A.
  • Klein, J.R.
  • Kormos, L.L.
  • Kos, M.S.
  • Kruger, A.
  • Kraus, C.
  • Krauss, C.B.
  • Krumins, A.V.
  • Kutter, T.
  • Kyba, C.C.M.
  • Labranche, H.
  • Lange, R.
  • Law, J.
  • Lawson, I.T.
  • Lesko, K.T.
  • Leslie, J.R.
  • Levine, I.
  • Loach, J.C.
  • Luoma, S.
  • MacLellan, R.
  • Majerus, S.
  • Mak, H.B.
  • Maneira, J.
  • Marino, A.D.
  • McCauley, N.
  • McDonald, A.B.
  • McGee, S.
  • McGregor, G.
  • Mifflin, C.
  • Miknaitis, K.K.S.
  • Moffat, B.A.
  • Nally, C.W.
  • Neubauer, M.S.
  • Nickel, B.G.
  • Noble, A.J.
  • Norman, E.B.
  • Oblath, N.S.
  • Okada, C.E.
  • Ollerhead, R.W.
  • Orrell, J.L.
  • Oser, S.M.
  • Ouellet, C.
  • Peeters, S.J.M.
  • Poon, A.W.P.
  • Rielage, K.
  • Robertson, B.C.
  • Robertson, R.G.H.
  • Rollin, E.
  • Rosendahl, S.S.E.
  • Rusu, V.L.
  • Schwendener, M.H.
  • Seibert, S.R.
  • Simard, O.
  • Simpson, J.J.
  • Sims, C.J.
  • Sinclair, D.
  • Skensved, P.
  • Smith, M.W.E.
  • Starinsky, N.
  • Stokstad, R.G.
  • Stonehill, L.C.
  • Tafirout, R.
  • Takeuchi, Y.
  • Tesic, G.
  • Thomson, M.
  • Thorman, M.
  • Tsui, T.
  • Van, R.
  • Berg, Van
  • R.G.
  • Water, de
  • Virtue, C.J.
  • Wall, B.L.
  • Waller, D.
  • Waltham, C.E.
  • Wan, H.
  • Tseung, Chan
  • Wark, D.L.
  • Wendland, J.
  • West, N.
  • Wilkerson, J.F.
  • Wilson, J.R.
  • Wittich, P.
  • Wouters, J.M.
  • Wright, A.
  • Yeh, M.
  • Zuber, K.
  • et al.
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the D_2O target. The addition of salt enhanced the signal from neutron capture, as compared to the pure D_2O detector. By making a statistical separation of charged-current events from other types based on event-isotropy criteria, the effective electron recoil energy spectrum has been extracted. In units of 106 cm-2 s-1, the total flux of active-flavor neutrinos from 8B decay in the Sun is found to be 4.94+0.21_-0.21(stat)+0.38_-0.34(syst) and the integral flux of electron neutrinos for an undistorted 8B spectrum is 1.68+0.06_-0.06(stat)+0.08_-0.09(syst); the signal from (nu_x,e) elastic scattering is equivalent to an electron-neutrino flux of 2.35+0.22-0.22(stat)+0.15_-0.15(syst). These results are consistent with those expected for neutrino oscillations with the so-called Large Mixing Angle parameters, and also with an undistorted spectrum. A search for matter-enhancement effects in the Earth through a possible day-night asymmetry in the charged-current integral rate is consistent with no asymmetry. Including results from other experiments, the best-fit values for two-neutrino mixing parameters are Delta m2 = (8.0+0.6_-0.4) x 10-5 eV2 and theta = 33.9 +2.4_-2.2 degrees.

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