The Sudbury Neutrino Observatory (SNO) has precisely determined the total active (nu_x) 8B solar neutrino flux without assumptions about the energy dependence of the nu_e survival probability. The measurements were made with dissolved NaCl in the heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21 +/- 0.27 (stat) +/- 0.38 (syst) x10^6 cm^{ -2}s^{ -1}, in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Delta m^{ 2} = 7.1^{ +1.2}_{ -0.6}x10^{ -5} ev^2 and theta = 32.5^{ +2.4}_{ -2.3} degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.
Categories: nucl-ex hep-ex