Abstract

The Sudbury Neutrino Observatory (SNO) is the first experiment to measure the total flux of active, high‐energy neutrinos from the sun. Results from SNO have solved the long‐standing “Solar Neutrino Problem” by demonstrating that neutrinos change flavor. SNO measured the total neutrino flux with the neutral‐current interaction of solar neutrinos with 1000 tonnes of D2O. In the first two phases of the experiment we detected the neutron from that interaction by capture on deuterium and capture on chlorine, respectively. In the third phase an array of 3He proportional counters was deployed in the detector. This allows a measurement of the neutral‐current neutrons that is independent of the Cherenkov light detected by the PMT array. We are currently developing a unique, detailed simulation of the current pulses from the proportional‐counter array that will be used to help distinguish signal and background pulses.

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