A Monte Carlo simulation of the Sudbury Neutrino Observatory proportional counters

Abstract

The third phase of the Sudbury Neutrino Observatory (SNO) experiment added an array of 3He proportional counters to the detector. The purpose of this Neutral Current Detection (NCD) array was to observe neutrons resulting from neutral-current solar neutrino-deuteron interactions. We have developed a detailed simulation of the current pulses from the NCD array proportional counters, from the primary neutron capture on 3He through the NCD array signal-processing electronics. This NCD array Monte Carlo simulation was used to model the alpha-decay background in SNO's third-phase 8B solar-neutrino measurement.

38 pages; submitted to the New Journal of Physics

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• Event Identification in ${}^3$He Proportional Counters Using Risetime Discrimination
• Unfolding Neutron Spectrum with Markov Chain Monte Carlo at MIT Research Reactor with He-3 Neutral Current Detectors
• Long-term evolution of the neutron rate at the Canfranc Underground Laboratory