Super Kamiokande

Super Kamiokande

. This neutrino detector has been built a kilometer underground in a Japanese zinc mine. The huge stainless-steel vessel, 40 meters tall and 40 meters wide, has been filled with 50,000 tons of highly purified water. Its walls are lined with 11,000 light sensors, called photo-multiplier tubes, that pick up a flash of light generated by electrons recoiling from neutrino collisions in the water. (Courtesy of Yoji Totsuka, Institute for Cosmic Ray Research, University of Tokyo.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University