XXth International Conference on Neutrino Physics and Astrophysics

Poster Abstract


Event Reconstruction at the Sudbury Neutrino Observatory

The Sudbury Neutrino Observatory is sensitive to solar neutrinos through three reactions: charged current, neutral current, and elastic scattering. Each neutrino interaction in SNO leads to either one or more gamma-rays or an electron in the detector giving rise to Cherenkov radiation, which is detected by approximately 9600 photomultiplier tubes. The relative time-of-flight, spatial distribution, and number of these photons detected are used to reconstruct the position in the detector and momentum of the events. The backgrounds in SNO (mostly low energy backgrounds from daughters of 232-Th and 238-U in detector materials) have characteristic distributions in position and momentum that are well separated from the neutrino events so that momentum and position cuts can be applied to reduce those backgrounds to a negligible fraction of the neutrino signal. The position and momentum distributions of neutrino events are also used as characteristic distributions for separating the three signal classes. An overview of event reconstruction in SNO and associated systematic uncertainties will be presented, along with the impact on the current solar neutrino flux measurements from SNO.

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