Sudbury Neutrino Observatory (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption SNO captured all flavors of neutrinos with an acrylic vessel (center) filled with a thousand metric tons of heavy water, surrounded by almost 10,000 photomultiplier tubes (PMTs). Berkeley Lab designed and built the support structure for the PMTs. Credit Photo Roy Kaltschmidt, Berkeley Lab 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.