Photomultiplier tubes, designed to pick up faint light signals from particle interactions, line the inside of a detector for the Daya Bay Reactor Neutrino experiment. (Credit: Roy Kaltschidt/Berkeley Lab)
Photomultiplier tubes, designed to pick up faint light signals from particle interactions, line the inside of a detector for the Daya Bay Reactor Neutrino experiment. (Credit: Roy Kaltschidt/Berkeley Lab) - The Daya Bay Reactor Neutrino Experiment collaboration - which made a precise measurement of an important neutrino property eight years ago, setting the stage for a new round of experiments and discoveries about these hard-to-study particles - has finished taking data. Though the experiment is formally shutting down, the collaboration will continue to analyze its complete dataset to improve upon the precision of findings based on earlier measurements. The experiment collected enough data within its first 55 days of operation to announce an important discovery in early March 2012. To celebrate this success and others that followed, the Daya Bay collaboration and science-agency officials will participate in a ceremony on Dec. 12 to mark the end of operations at the site ( see event details in sidebar ). International partnership enables experiment's successes Operating in a cavernous underground space containing a series of large, drum-like particle detectors immersed in large pools of water in Guangdong, China, the experiment was built through an international effort that featured a first-of-its-kind equal partnership in a major physics project between the U.S. and China.
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