Lawrence Berkeley National Laboratory
The Sudbury Neutrino Observatory has demonstrated the existence of neutrino flavor change by measuring the total active 8B solar neutrino flux and its electron neutrino component. These measurements have placed strong constraints on the solar sector neutrino oscillation parameters. A recent improved analysis of the first two phases of the experiment has benefited from an increase in statistics, because of a lower energy threshold, and substantial reductions in systematic uncertainties. This talk describe the new analysis and improvements that have led to a dramatic increase in the experiment's precision.