Abstract
The Sudbury Neutrino Observatory (SNO) is a new 1000-t D 2O Cherenkov solar neutrino detector. A high-energy gamma-ray source is needed to calibrate SNO beyond the 8B solar neutrino endpoint of 15 MeV. This paper describes the design and construction of a source that generates 19.8-MeV gamma rays using the 3H(p,γ) 4He reaction (“pT”), and demonstrates that the source meets all the physical, operational and lifetime requirements for calibrating SNO. An ion source was built into this unit to generate and to accelerate protons up to 30 keV, and a high-purity scandium tritide target with a scandium–tritium atomic ratio of 1 : 2.0±0.2 was included. This pT source is the first self-contained, compact, and portable high-energy gamma-ray source ( E γ >10 MeV) .
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