Scientists and engineers with the University of Wisconsin-Madison who are working on a giant neutrino observatory at the South Pole are coming off one of their most successful construction seasons.
Workers in Antarctica installed 19 strings of optical sensors in 1½-mile-deep holes drilled into the crystalline ice. That surpassed the projectâ??s goal by three and put the observatory on track to be completed by 2011, according to Francis Halzen, principal investigator of IceCube and a UW-Madison physics professor.