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Irvine–Michigan–Brookhaven (detector)
IMB, the Irvine-Michigan-Brookhaven detector, was a nucleon decay experiment and neutrino observatory located in a Morton Salt company's Fairport mine on the shore of Lake Erie in the United States. It was a joint venture of the University of California, Irvine, the University of Michigan, and the Brookhaven National Laboratory.〔The Underground Search for Cluses to an Unstable Universe, (Popular Science ), Vol. 219, No. 8 (December, 1981); pages 64-67.〕 Like several other particle detectors (see ''Kamiokande II''), it was built primarily with the goal of observing proton decay, but it achieved greater fame through neutrino observation, particularly those from Supernova SN 1987A.〔(John C. Vander Velde's IMB page ), accessed 11 April 2008.〕
== Design ==
IMB consisted of a roughly cubical tank about 17 × 17.5 × 23 meters, filled with 2.5 million gallons of ultrapure water which was surrounded by 2,048 photomultiplier tubes.〔(A Proposal for a Long Baseline Oscillation Experiment Using A High Intensity Neutrino Beam from the Fermilab Main Injector to the IMB Water Cerenkov Detector; FNAL P805. )〕 IMB detected fast moving particles such as those produced by proton decay or neutrino interactions by picking up the Cerenkov radiation generated when such a particle moves faster than the speed of light in water. Since directional information was available from the phototubes, it was able to estimate the initial direction of neutrinos.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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