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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Daya Bay Reactor Neutrino Experiment ： ウィキペディア英語版 Daya Bay Reactor Neutrino Experiment The Daya Bay Reactor Neutrino Experiment is a China-based multinational particle physics project studying neutrinos. The multinational collaboration includes researchers from China, Chile, the United States, Taiwan, Russia, and the Czech Republic. The US side of the project is funded by the US Department of Energy's Office of High Energy Physics. It is situated at Daya Bay, approximately 52 kilometers northeast of Hong Kong and 45 kilometers east of Shenzhen. There is an affiliated project in the Aberdeen Tunnel Underground Laboratory in Hong Kong. It measures the neutrons produced by cosmic muons which may affect the Daya Bay Reactor Neutrino Experiment. The experiment consists of eight antineutrino detectors, clustered in three locations within of six nuclear reactors. Each detector consists of 20 t of liquid scintillator (linear alkylbenzene doped with gadolinium) surrounded by photomultiplier tubes and shielding. A much larger follow-up is in development in the form of the Jiangmen Underground Neutrino Observatory(JUNO) in Kaiping, which will use an acrylic sphere filled with 20,000 t of liquid scintillator to detect reactor antineutrinos. Groundbreaking began January 10, 2015, with operation expected in 2020. ==Neutrino oscillations== The experiment studies neutrino oscillations and is designed to measure the mixing angle ''θ''13 using antineutrinos produced by the reactors of the Daya Bay Nuclear Power Plant and the Ling Ao Nuclear Power Plant. Scientists are also interested in whether neutrinos are CP violators. On 8 March 2012, the Daya Bay collaboration announced a 5.2σ discovery of ''θ''13 ≠ 0, with : $\backslash sin^2\; (2\backslash theta\_)\; =\; 0.092\; \backslash pm\; 0.016\; \backslash ,\; \backslash mathrm\; \backslash pm\; 0.005\backslash ,\; \backslash mathrm.$ This significant result represents a new type of oscillation and is surprisingly large.〔http://neutrino.physics.berkeley.edu/news/News.html〕 It is consistent with earlier, but less significant results by T2K, MINOS and Double Chooz. With ''θ''13 so large, NOνA has about a 50% probability of being sensitive to the neutrino mass hierarchy. Experiments may also be able to probe CP violation among neutrinos. The collaboration produced an updated analysis of their results in 2014, which used the energy spectrum to improve the bounds on the mixing angle: : $\backslash sin^2\; (2\backslash theta\_)\; =\; 0.090^\_$ An independent measurement was also published using events from neutrons captured on hydrogen: $\backslash sin^2\; (2\backslash theta\_)\; =\; 0.083\; \backslash pm\; 0.018$ Daya Bay has used its data to search for signals of a light sterile neutrino, resulting in exclusions of some previous unexplored mass regions. At the Moriond 2015 physics conference a new best fit for mixing angle and mass difference was presented: $\backslash sin^2(2\backslash theta\_)\; =\; 0.084\; \backslash pm\; 0.005,\; \backslash quad\; |\backslash Delta\; m^2\_|\; =\; 2.44^\_\; \backslash times\; 10^\; ^2$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Daya Bay Reactor Neutrino Experiment」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.