Neutral Current Measurement at the Sudbury Neutrino Observatory: Past and Future

Physics

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Scientific paper

With its first direct measurement of the total flux of ^8B solar neutrinos last year, the Sudbury Neutrino Observatory (SNO) provided strong evidence for the resolution of a question that has puzzled physicists for a quarter of a century. This mile and a quarter deep telescope revealed that the deficit of solar electron neutrinos seen in experiments to date was neither a misunderstanding of detectors or solar models, but of the nature of neutrinos themselves; thus confirming suspicions that, similar to quarks, the lepton sector must allow for flavor transformations. With the "Year of the Neutrino" behind it, SNO continues to move forward. Later this year, nearly 400 m of ^3He proportional counters will be immersed into SNO's 1000 tonnes of heavy water, essentially making SNO a new experiment. This forest of neutral current detectors is designed to allow independent confirmation of the previous result and to possibly set tighter limits on the ^8B solar neutrino flux. All the while, allowing SNO to be a 100% live-time supernova detector.

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