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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 Accelerator Neutrino Neutron Interaction Experiment ： ウィキペディア英語版 Accelerator Neutrino Neutron Interaction Experiment The Accelerator Neutrino Neutron Interaction Experiment, abbreviated as ANNIE, is a proposed water Cherenkov detector experiment designed to examine the nature of neutrino interactions. This experiment will study phenomena like proton decay, and neutrino oscillations, by analyzing neutrino interactions in gadolinium-loaded water and measuring their neutron yield. Neutron Tagging plays an important role in background rejection from atmospheric neutrinos. By implementing early prototypes of LAPPDs (''Large Area Picosecond Photodetector''), high precision timing is possible. The suggested location for ANNIE is the ''Sci-BooNE'' hall on the ''Booster Neutrino Beam'' associated with the MiniBooNE experiment. The neutrino beam originates in Fermilab where The Booster delivers 8 GeV protons to a beryllium target producing secondary pions and kaons. These secondary mesons decay to produce a neutrino beam with an average energy of around 800 MeV. ANNIE will begin installation in the summer of 2015. ==Experimental design== ANNIE will be run using the Booster Neutrino Beam (BNB) which runs at 7.5 Hz, with roughly 4 x 1012 protons-on-target per spill. these are delivered in 81 bunches over 1.6 microseconds per spill to a target 100 meters upstream of the SciBooNE hall. The beam, in neutrino mode, is 94% pure muon neutrinos with a flux peak energy at around 700 MeV.〔 The water target use by ANNIE is a cylindrical volume 3.8 m long and 2.3 m in diameter encased by a plastic liner and aluminum enclosure. The target is to be instrumented by 60 to 100 eight-inch photomultiplier tubes. Part of the iron-scintillator sandwich detector used to track the direction of daughter muons in the SCiBooNE target, called the Muon Range Detector (MRD), could be used by ANNIE. The MRD will be modified by replacing 10 or the 13 layers of scintillator with resistive plate chambers (RPCs). This upgrade will allow centimeter-level precision at each layer. Moreover, the RCPs are capable of withstanding a 1 T magnetic field. Such an applied field could someday be added to ANNIE in order to achieve charge-spin reconstruction in the MRD. This would also allow momentum reconstruction at the highest event energies. Given the few-meter scale of the detector, it would be possible to achieve timing based reconstruction of events using information from the Cherenkov radiation produced during events in the detector. In order to achieve the necessary picosecond time resolution, ANNIE intends to use early commercial prototypes of Large Area Picosecond Photodetectors (LAPPDs).〔 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「Accelerator Neutrino Neutron Interaction 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.