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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 Solar neutrino unit ： ウィキペディア英語版 Solar neutrino unit The solar neutrino unit (SNU) is a unit of Solar neutrino flux widely used in neutrino astronomy and radiochemical neutrino experiments. It is equal to the neutrino flux producing 10−36 captures per target atom per second.〔http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-97-2534-12 1997〕 It is convenient given the very low event rates in radiochemical experiments. Typical rate is expected to be from tens SNU to hundred SNU.〔()〕 In principle there are two ways of detecting solar neutrinos: radiochemical and real time experiments. The principle of radiochemical experiments is the reaction of the form $^\_Z\; +\; \backslash nu\_\backslash longrightarrow^\_(Z+1)+e^$. The daughter nucleus's decay is used in the detection. Production rate of the daughter nucleus is given by $R\; =\; N\backslash int\backslash Phi(E)\backslash sigma(E)dE$, where * $\backslash Phi$ is the solar neutrino flux * $\backslash sigma$ is the cross section for the radiochemical reaction * $N$ is the number of target atoms. With typical neutrino flux of 1010 cm−2 s−1 and a typical interaction cross section of about 10−45 cm2, about 1030 target atoms are required to produce one event per day. Taking into account that 1 mole is equal to 6.022 atoms, this number corresponds to ktons of the target substances, whereas present neutrino detectors operate at much lower quantities of those. ==See also== *Neutrino *Neutrino detector *Mole (unit) *Solar neutrino 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「Solar neutrino unit」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.