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