翻訳と辞書 Words near each other ・ Nucleic acid quantitation ・ Nucleic acid quaternary structure ・ Nucleic acid secondary structure ・ Nucleic acid sequence ・ Nucleic acid structure ・ Nucleic acid structure determination ・ Nucleic acid structure prediction ・ Nucleic acid templated chemistry ・ Nucleic acid tertiary structure ・ Nuclear pulse propulsion ・ Nuclear pumped laser ・ Nuclear quadrupole resonance ・ Nuclear Rabbit ・ Nuclear RAT ・ Nuclear reaction ・ Nuclear reaction analysis ・ Nuclear reactor ・ Nuclear reactor accidents in the United States ・ Nuclear reactor coolant ・ Nuclear reactor core ・ Nuclear Reactor Operator Badge ・ Nuclear reactor physics ・ Nuclear reactor safety systems ・ Nuclear receptor ・ Nuclear receptor co-repressor 1 ・ Nuclear receptor co-repressor 2 ・ Nuclear receptor coactivator 1 ・ Nuclear receptor coactivator 2 ・ Nuclear receptor coactivator 3 ・ Nuclear receptor coregulators Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nuclear reaction analysis ： ウィキペディア英語版 Nuclear reaction analysis Nuclear reaction analysis (NRA) is a nuclear method in materials science to obtain concentration vs. depth distributions for certain target chemical elements in a solid thin film. If irradiated with select projectile nuclei at kinetic energies ''E''kin these target elements can undergo a nuclear reaction under resonance conditions for a sharply defined resonance energy. The reaction product is usually a nucleus in an excited state which immediately decays, emitting ionizing radiation. To obtain depth information the initial kinetic energy of the projectile nucleus (which has to exceed the resonance energy) and its stopping power (energy loss per distance traveled) in the sample has to be known. To contribute to the nuclear reaction the projectile nuclei have to slow down in the sample to reach the resonance energy. Thus each initial kinetic energy corresponds to a depth in the sample where the reaction occurs (the higher the energy, the deeper the reaction). For example, a commonly used reaction to profile hydrogen is :15N + 1H → 12C + α + γ (4.965MeV) with a resonance at 6.385 MeV. The energetic emitted γ ray is characteristic of the reaction and the number that are detected at any incident energy is proportional to the concentration at the respective depth of hydrogen in the sample. The H concentration profile is then obtained by scanning the 15N incident beam energy. Hydrogen is an element inaccessible to RBS due to its low mass, although it is often analysed by elastic recoil detection. NRA can also be used non-resonantly. For example, deuterium can easily be profiled with a 3He beam without changing the incident energy by using the :3He + D = α + p + 18.353 MeV reaction. The energy of the fast proton detected depends on the depth of the deuterium atom in the sample. ==External links== Details of many known reactions are hosted by the IAEA at http://www-nds.iaea.org/ibandl/. The energy released in nuclear reactions (the "Q value") can easily be calculated (from E=mc2): see http://nucleardata.nuclear.lu.se/database/masses/. * (NRA at JSI Microanalytical center in Ljubljana, Slovenia ) 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「Nuclear reaction analysis」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.