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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 Nuclear orientation ： ウィキペディア英語版 Nuclear orientation Nuclear orientation, in nuclear physics, is the directional ordering of an assembly of nuclear spins with respect to some axis in space.〔(Nuclear orientation ), ''The Free Dictionary''.〕〔(Nuclear orientation ), ''(AccessScience )''.〕 A nuclear level with spin in a magnetic field will divide into magnetic sub-levels with an energy spacing.〔(General Idea of Nuclear Orientation ), (Nuclear Orientation Group ), University of Oxford, UK.〕 The populations of these levels are determined by the Boltzmann distribution at a steady temperature and will essentially be equal. The exponential in the Boltzmann distribution should not be equal to 1 to obtain unequal populations. To achieve this, cooling to a temperature of around 10 millikelvin is needed. Typically, this is achieved by implanting the nuclei of interest into ferromagnetic hosts. In the mid-1940s, Yevgeny Zavoisky developed electron paramagnetic resonance, eventually leading to the concept of nuclear orientation.〔B. Bleaney and O. V. Lounasmaa, (Nuclear Orientation and Nuclear Cooling Experiments in Oxford and Helsinki. Part 2. Progress from 1945 to 1970 ). ''Notes and Records of the Royal Society of London'', Volume 57, Number 3, pages 323–330, September 2003. Published by The Royal Society.〕 In the early 1950s, Neville Robinson, Jim Daniels, and Michael Grace produced an example of nuclear orientation for the first time at the Clarendon Laboratory, University of Oxford.〔Nicholas Kurti, (Obituary: Neville Robinson ). ''The Independent'', 27 November 1996.〕 There is now a Nuclear Orientation Group at Oxford.〔 == Bibliography == * K. S. Krane, (Nuclear orientation and nuclear structure ). ''Hyperfine Interactions'', Volume 43, Numbers 1–4, pages 3–14, December, 1988. * B. Bleaney, (Cross-relaxation and nuclear orientation in ytterbium vanadate ). ''Proceedings: Mathematical, Physical and Engineering Sciences'', Volume 455, Number 1988, pages 2835–2839, 8 August 1999. Published by The Royal Society. * B. Bleaney, (Dynamic nuclear polarization and nuclear orientation in terbium vanadate ). ''Applied Magnetic Resonance'', Volume 21, Number 1, pages 35–38, December, 1988. 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 orientation」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.