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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 Enriched Xenon Observatory ： ウィキペディア英語版 Enriched Xenon Observatory The Enriched Xenon Observatory (EXO) is a particle physics experiment searching for neutrinoless double beta decay of xenon-136 at WIPP near Carlsbad, NM. Neutrinoless double beta decay(0νββ) detection would prove the Majorana nature of neutrinos and impact the neutrino mass values and ordering. These are important open topics in particle physics. EXO currently has a 200-kilogram xenon liquid time projection chamber with R&D efforts on a ton-scale experiment. Xenon double beta decay was detected and limits have been set for 0νββ. == Overview == EXO measures the rate of neutrinoless decay events above the expected background of similar signals, to find or limit the double beta decay half-life, which relates to the effective neutrino mass using nuclear matrix elements. A limit on effective neutrino mass below 0.01 eV, would determine the neutrino mass order. The effective neutrino mass is dependent on the lightest neutrino mass in such a way that that bound indicates the normal mass hierarchy.〔See P. Vogel, A. Piepke (2007). "(Neutrinoless Double-beta decay )", in 〕 The expected rate of 0νββ events is very rare, so background radiation is a significant problem. WIPP has 650 m of rock overburden, equivalent to 1600m of water, to screen incoming cosmic rays. Lead shielding and a cryostat also protect the setup. The neutrinoless decays would appear as narrow spike in the energy spectrum around the xenon Q-value (Qββ = 2457.8 keV), which is fairly high and above most gamma decays. 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「Enriched Xenon 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.