Electron energy spectra, fluxes, and day-night asymmetries of 8B solar neutrinos from measurements with NaCl dissolved in the heavy-water detector at the Sudbury Neutrino Observatory -: art. no. 055502

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the (H2O)-H-2 ("D2O") target. The addition of salt enhanced the signal from neutron capture as compared to the pure D2O 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 10(6)cm(-2)s(-1), the total flux of active-flavor neutrinos from B-8 decay in the Sun is found to be 4.94(-0.21)(+0.21)(stat)(-0.34)(+0.38)(syst) and the integral flux of electron neutrinos for an undistorted B-8 spectrum is 1.68(-0.06)(+0.06)(stat)(-0.09)(+0.08)(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 m(2)=(8.0(-0.4)(+0.6))x10(-5) eV(2) and theta=33.9(-2.2)(+2.4) degrees.