IceTop Surface Array of Optical Detectors (IMAGE) University of Delaware Caption The IceTop surface array of detectors is installed on top of the over mile-long string of optical detectors frozen in deep holes below the snow-covered surface. The surface "eyes" will measure cascades of neutrino particles generated by high-energy cosmic rays. Credit University of Delaware Usage Restrictions Image must include credit to University of Delaware. 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.