T2K (IMAGE) University of Colorado at Boulder Caption The neutrino detector used in the T2K experiments surrounds 50,000 gallons of super pure water with 11,200 light-detecting photomultiplier tubes. Credit Science and Technology Facilities Council of the United Kingdom Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.