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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 ： ウィキペディア英語版 Solar neutrino Electron neutrinos are produced in the Sun as a product of nuclear fusion. By far the largest fraction of neutrinos passing through the Earth are Solar neutrinos. == Mechanisms == The main contribution comes from the proton-proton reaction. The reaction is: : $p\; +\; p\; \backslash to\; \backslash text\; +\; e^\; +\; \backslash nu\_e\; \backslash !\backslash$ or in words: : 2 protons $\backslash to$ deuterium + positron + electron neutrino. From this reaction, 86% of all solar neutrinos are produced. As seen in figure, Solar neutrinos (proton-proton chain) in the Standard Solar Model, the deuterium will fuse with another proton to create a 3He nucleus and a gamma ray. This reaction can be seen as: : $d\; +\; p\; \backslash to\; He\; +\; \backslash gamma\backslash$ The isotope 4He can be produced by using the 3He in the previous reaction which is seen below. : $He\; +\; He\; \backslash to\; He\; +\; 2\; p$ With both helium-3 and helium-4 in the system now, beryllium can be fused by the reaction of one of each helium nucleus as seen in the reaction: : $He\; +\; He\; \backslash to\; Be\; +\; \backslash gamma\backslash$ Since there are four protons and only three neutrons, the beryllium can go down two different paths from here. The beryllium could capture an electron and produce a lithium-7 nucleus and an electron neutrino. It can also capture a proton due to the abundance in a star. This will create boron-8. Both reactions are as seen below respectfully: : $Be\; +\; e^\; \backslash to\; Li\; +\; \backslash nu\_e\backslash$ This reaction produces 14% of the solar neutrinos. The lithium-7 will combine with a proton to produce 2 nuclei of helium-4. : $Be\; +\; p\; \backslash to\; B\; +\; \backslash gamma\backslash$ The boron-8 will beta(+) decay into beryllium-8 due to the extra proton which can be seen below: : $B\; \backslash to\; Be\; +\; e^\; +\; \backslash nu\_e\backslash$ The reaction produces about 0.02% of the solar neutrinos. These few solar neutrinos have the larger energies. The asterisk on beryllium-8 indicates that the nucleus is in an excited state. : $Be\; \backslash to\; He\; +\; He$ The excited beryllium-8 nucleus then splits into two helium-4 nuclei. 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」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.