Part of the EXO-200 Underground Detector (IMAGE) DOE/SLAC National Accelerator Laboratory Caption Part of the EXO-200 underground detector, which searched for a hypothetical nuclear decay that could reveal how neutrinos acquire their incredibly small mass. Credit EXO-200 Collaboration 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.