| 翻訳と辞書 |
| Jiangmen Underground Neutrino Observatory ： ウィキペディア英語版 |
Jiangmen Underground Neutrino Observatory
The Jiangmen Underground Neutrino Observatory (JUNO) is a medium baseline〔 reactor neutrino experiment at Kaiping, Jiangmen in Southern China. It aims to determine the neutrino mass hierarchy and perform precision measurements of the Pontecorvo–Maki–Nakagawa–Sakata matrix elements. It will build on the mixing parameter results of many previous experiments. The collaboration was formed in July 2014 and construction began January 10, 2015. Funding is provided by the Chinese Academy of Sciences, but the collaboration is international.
Planned as a follow-on to the Daya Bay Reactor Neutrino Experiment, it was originally planned for the same location, but the construction of a third nuclear reactor (the planned Lufeng nuclear power plant) in that area would disrupt the experiment, which depends on maintaining a fixed distance to nearby nuclear reactors.〔 Instead it was moved to a loation 53 km from both of the planned Yangjiang and Taishan nuclear power plants.
== Detector ==
The main detector consists of a sphere of 20,000 tons of linear alkylbenzene liquid scintillator, surrounded by approximately 15000 photomultiplier tubes, a water pool, and a muon veto. Deploying this 700 m underground will detect neutrinos with excellent energy resolution. The overburden includes 270 m of granite mountain, which will reduce cosmic muon background.
The much larger distance to the reactors (compared to less than 2 km for the Daya Bay far detector) makes the experiment better able to distinguish neutrino oscillations, but requires a much larger, and better-shielded, detector to detect a sufficient number of reactor neutrinos.
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「Jiangmen Underground Neutrino Observatory」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.
|
|