Observatory of neutrinos of Sudbury
The Observatoire of neutrinos of Sudbury ( ONS or SNO ) is a detector of solar Neutrino S builds under two Kilomètre S of rock in a mine of Nickel activates located at 25 kilometers of the Large-Sudbury downtown area of , in Ontario, with the Canada. It is a Tcherenkov detector with heavy Eau, i.e. it is sensitive in the light of the Effet Tcherenkov emitted by the electron S accelerated during reactions with the neutrinos.
The principal reactions taking place in the detector are: elastic scattering on the atomic electrons, the dissociation of the cores of Deuterium (known as of neutral current), and the transformation of a Neutron into Proton related to the emission of an electron (known as of current charged).
The detector is composed of an acrylic resin sphere containing 1 000 ton S of heavy water surrounded by 1 700 tons of light water, more 5 300 other tons of light water used as shielding against the ambient Radioactivity. The sphere is surrounded of almost 10 000 detectors of light (photomultipliers).
Lately, forty detectors made up of tubes containing of the Hélium 3 were installed in heavy water, so as to improve the sensitivity of SNO to the reactions of neutral current.
SNO is also able to detect a Supernova which would explode in our Galaxie.
- List of the astronomical observatories
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