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Neutrino oscillation is a quantum mechanical phenomenon whereby a neutrino created with a specific lepton flavour (electron, muon, or tau) can later be measured to have a different flavour. The probability of measuring a particular flavour for a neutrino varies periodically as it propagates through space. First predicted by Bruno Pontecorvo in 1957,〔 reproduced and translated in and reproduced and translated in 〕 neutrino oscillation has since been observed by a multitude of experiments in several different contexts. Also, it turned out to be the resolution to the long-standing solar neutrino problem. Neutrino oscillation is of great theoretical and experimental interest, since observation of the phenomenon implies that the neutrino has a non-zero mass, which was not included as part of the original Standard Model of particle physics.〔 The discovery of proof for neutrino oscillation, and thus neutrino mass by Takaaki Kajita at the Super-Kamiokande Observatory and Arthur McDonald at the Sudbury Neutrino Observatory won them the 2015 Nobel Prize for Physics. ==Observations== A great deal of evidence for neutrino oscillation has been collected from many sources, over a wide range of neutrino energies and with many different detector technologies.〔 〕 The 2015 Nobel Prize in Physics was shared by Takaaki Kajita and Arthur B. McDonald for their early pioneering observations of oscillations. 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「neutrino oscillation」の詳細全文を読む スポンサード リンク
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