2019-03-05 12:12:12

NEUTRINO research has suffered a major setback. Japan’s Super-Kamiokande detector is out of action after one of the phototubes lining its water-filled tank imploded during a routine refill. The shock wave destroyed another 7000 of 11,000 vacuum tubes, which pick up flashes of light created when neutrinos interact with the water. The tank is now contaminated with glass and chemicals. The main loss is an experiment called K2K in which neutrinos were fired from Tokyo to the Super-Kamiokande to measure how rapidly they change from one type to another. Yoji Totsuka, the experiment’s director,