梶田隆章  客座教授

Takaaki Kajita  Guest Professor

诺贝尔物理学奖得主（2015） Nobel Laureate in Physics (2015)

经历与成果：

梶田隆章教授是东京宇宙物理与数学研究所的首席研究员，也是东京大学宇宙射线研究所所长。2015年，由于发现了中微子振荡，并且证明了中微子具有质量，他与加拿大物理学家阿瑟·麦克唐纳分享了诺贝尔物理学奖。

梶田隆章教授长期利用神冈探测器和超级神冈探测器，研究大气层中中微子以及中微子振荡。在1988年，他们发现了大气层中中微子的反常现象。在该项研究中，他们利用神冈探测器发现μ中微子与电中微子的数量比率仅为理论预言的60%。在接下来的1994年，他们发现这一现象与天顶角或中微子的飞行距离有关，这就意味着中微子震荡。在1996年，他们将神冈探测器改进为超级神冈探测器，并开始依托超级神冈探测器进行实验。在1998年，通过分析超级神冈探测器获得的更加精确的实验数据，他们得出了数量比率短缺是因为中微子振荡的结论。

研究领域：

中微子物理

Experience and achievements：

Prof. Kajita is a principal investigator at the Institute for the Physics and Mathematics of the Universe in Tokyo, and director of Institute for Cosmic Ray Research, University of Tokyo. In 2015, he shared the Nobel Prize in Physics with Canadian physicist Arthur McDonald for the discovery of neutrino oscillations, which shows that neutrinos have mass.

Prof. Kajita has been working in Kamiokande and Super-Kamiokande experiments. In particular, he has been studying atmospheric neutrinos and neutrino oscillations. In 1988, they discovered theatmospheric neutrino anomaly.In this study,theyshowed that the nm/ne ratio observed in Kamiokande was only about 60% of the predicted ratio.Subsequently, in 1994, they discovered that the atmospheric muon-neutrino deficit depends on the zenith-angle or equivalently on the neutrino flight length, which was another indication for the neutrino oscillations. In 1996, the Super-Kamiokande experiment started. In 1998, by the study of the high statistics data from Super-Kamiokande, they concluded that the observed atmospheric muon-neutrino deficit was due to neutrino oscillations.

Research field：

Neutrino physics