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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 GERmanium Detector Array ： ウィキペディア英語版 GERmanium Detector Array The GERmanium Detector Array (GERDA) experiment is searching for neutrinoless double beta decay(0vββ) in Ge-76 at the underground Laboratori Nazionali del Gran Sasso (LNGS). Neutrinoless beta decay is expected to be a very rare process if it occurs. The collaboration predicts less than one event each year per kilogram of material, appearing as a narrow spike around the 0vββ Q-value(Qββ = 2039 keV) in the observed energy spectrum. This means background shielding is required to detect any rare decays. The LNGS facility has 1400 meters of rock overburden, equivalent to 3000 meters of water shielding, reducing cosmic radiation background. == Design == The experiment uses high purity enriched Ge crystal diodes (HPGe) as a beta decay source and particle detector. The detectors from the HdM and Igex experiments were reprocessed and used in phase 1. The detector array is suspended in a liquid argon cryostat lined with copper and surrounded by an ultra-pure water tank. PMTs in the water tank and plastic scintillators above detect and exclude background muons. Pulse-shape discrimination (PSD) is applied as a cut to discriminate between particle types. Phase 2 will increase the active mass to 38 kg using 30 new broad energy germanium (BEGe) detectors. A magnitude reduction in background is planned to 10−3 counts/(keV·kg·yr) using cleaner materials. This will increase the half-life sensitivity to 1026 years once 100 kg·yr of data is taken and enable evaluation of possible ton-scale expansion. 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「GERmanium Detector Array」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.