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The Sudbury Neutrino Observatory has measured the $^8$B solar neutrino fluxusing an array of 3He proportional counters. Results obtained using aMarkov-Chain Monte-Carlo (MCMC) parameter estimation, integrating over astandard extended likelihood, yield effective neutrino fluxes of:phi_nc=5.54+0.33-0.31(stat)+0.36-0.34(syst) x 10^6 /cm^2/s,phi_cc=1.67+0.05-0.04(stat)+0.07-0.08(syst) x 10^6 /cm^2/s, andphi_es=1.77+0.24-0.21(stat)+0.09-0.10(syst) x 10^6 /cm^2/s. These measurementsare in agreement with previous solar neutrino flux measurements, and withneutrino oscillation model results. Including these flux measurements in aglobal analysis of solar and reactor neutrino results yields an improvedprecision on the solar neutrino mixing angle of theta=34.4+1.3-1.2 degrees, andDelta m^2=7.59+0.19-0.21 eV^2.

Measurement of the Solar Neutrino Flux with an Array of Neutron Detectors in the Sudbury Neutrino Observatory