33-4 - scatter in the water – heavier muons travel in...

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View into Super-K from tank top: an application of the photoelectric effect Each photomultiplier tube is 20 inches in diameter! 51
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Cherenkov light in water: applying ph116 optics Neutrino interacts in a nucleus in the water (oxygen or hydrogen) Produces a charged muon or electron, which carries an electromagnetic field Muon travels at v ~ c, but light travels at v=c/n ~ ¾ c in water Muon is going faster than its fields can travel in water: "shock wave" builds up Cherenkov light is emitted, in characteristic 42 o rings around the particle direction Cherenkov 'rings' are fuzzy for electrons and sharp for muons electrons
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Unformatted text preview: scatter in the water – heavier muons travel in straight paths until stopped n m light rays (v=0.75c) v ! c water (n=1.33) light waves Super-Kamiokande and T2K, in Japan Super-Kamiokande Underground Neutrino Observatory • In Mozumi mine of Kamioka Mining Co, near Toyama City • Detects natural (solar, atmospheric) and beam (T2K) neutrinos T2K (Tokai to Kamiokande) long baseline experiment • Neutrino beam is generated and sampled at Tokai (particle physics lab, near Tokyo) • Beam goes through the earth to Super-K, 300 km away Toyama SK Tokai 53 Super-K: underground neutrino observatory Tokyo Kamioka Tokai N...
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