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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 SAGE (Soviet–American Gallium Experiment) ： ウィキペディア英語版 SAGE (Soviet–American Gallium Experiment) SAGE (''Soviet–American Gallium Experiment'', or sometimes ''Russian-American Gallium Experiment'') is a collaborative experiment devised by several prominent physicists to measure the solar neutrino flux. ==The Experiment== SAGE was devised to measure the radio-chemical solar neutrino flux based on the inverse beta decay reaction, 71Ga$\backslash left(\backslash nu\_e,e^\backslash right)$71Ge. The target for the reaction was 50-57 tonnes of liquid gallium metal stored deep underground at the Baksan Neutrino Observatory in the Caucasus mountains in Russia. About once a month, the neutrino induced Ge is extracted from the Ga. 71Ge is unstable with respect to electron capture ($t\_=11.43$ days) and, therefore, the amount of extracted germanium can be determined from its activity as measured in small proportional counters. The experiment had begun to measure the solar neutrino capture rate with a target of gallium metal in December 1989 and is running up to now () with only a few brief interruptions. The experiment has measured the solar neutrino flux in 168 extractions between January 1990 and December 2007. The current result of the experiment based on the whole 1990-2007 set of data is 65.4 +3.1/-3.0 (statistical) +2.6/-2.8 (systematic) SNU. This represents only 56%-60% of the capture rate predicted by different Standard Solar Models, which predict 138 SNU. The difference is in agreement with neutrino oscillations. The collaboration has used a 518 kCi 51Cr neutrino source to test the experimental operation. The energy of these neutrinos is similar to the solar 7Be neutrinos and thus makes an ideal check on the experimental procedure. The extractions for the Cr experiment took place between January and May 1995 and the counting of the samples lasted until fall. The result, expressed in terms of a ratio of the measured production rate to the expected production rate, is 1.0±0.15. This indicates that the discrepancy between the solar model predictions and the SAGE flux measurement cannot be an experimental artifact. Also calibrations with a 37Ar neutrino source had been performed. 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「SAGE (Soviet–American Gallium 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.