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Takaaki Kajita


Takaaki Kajita

Takaaki Kajita
Native name 梶田 隆章
Born (1959-03-09) 9 March 1959
Higashimatsuyama, Saitama, Japan
Institutions Institute for Cosmic Ray Research, University of Tokyo
Education Saitama Prefectural Kawagoe High School
Alma mater Saitama University (B.S.)
University of Tokyo (M.S., Ph.D.)
Doctoral advisor Masatoshi Koshiba
Other academic advisors Yoji Totsuka
Notable awards Asahi Prize (1988)
Bruno Rossi Prize (1989)
Nishina Memorial Prize (1999)
Panofsky Prize (2002)
Japan Academy Prize (2012)
Nobel Prize in Physics (2015)
Spouse Michiko

Takaaki Kajita (梶田 隆章 Kajita Takaaki, born 9 March 1959) is a Japanese physicist, known for neutrino experiments at the Kamiokande and its successor, Super-Kamiokande. In 2015, he was awarded the Nobel Prize in Physics jointly with Canadian physicist Arthur B. McDonald.


  • Early and personal life 1
  • Career 2
  • Awards 3
  • See also 4
  • References 5
  • External links 6

Early and personal life

Kajita was born in 1959 in Higashimatsuyama, Saitama, Japan.[1] His wife, Michiko, lives in Toyama.[2]


Kajita studied at the Saitama University and graduated in 1981. He received his doctorate in 1986 at the University of Tokyo.[2] Since 1988 he has been at the Institute for Cosmic Radiation Research, University of Tokyo, where he became an assistant professor in 1992 and professor in 1999.[3]

He became director of the Center for Cosmic Neutrinos at the Institute for Cosmic Ray Research (ICRR) in 1999. As of 2015, he is at the Institute for the Physics and Mathematics of the Universe in Tokyo and Director of ICRR.[4]

In 1998, Kajita's team at the Super-Kamiokande found that when cosmic rays hit the Earth's atmosphere, the resulting neutrinos switched between two flavours before they reached the detector under Mt. Kamioka.[2][5] This discovery helped prove the existence of neutrino oscillation and that neutrinos have mass. In 2015, Kajita's shared the Nobel Prize in Physics along with Canadian physicist Arthur McDonald, whose Sudbury Neutrino Observatory discovered similar results.[5] Kajita and McDonald's work solved the longstanding Solar neutrino problem problem, which was a major discrepancy between the predicted and measured Solar neutrino fluxes, and indicated that the Standard Model, which required neutrinos to be massless, had weaknesses.[5] In a news conference at the University of Tokyo, shortly after the Nobel announcement, Kajita said, "I want to thank the neutrinos, of course. And since neutrinos are created by cosmic rays, I want to thank them, too."[6]

One of the first people Kajita called after receiving the Nobel Prize was 2002 Nobel physics winner Masatoshi Koshiba, his former mentor and a fellow neutrino researcher.[2]


See also


  1. ^ "Takaaki Kajita - Facts".  
  2. ^ a b c d "Japan’s Takaaki Kajita shares Nobel in physics".  
  3. ^ "2015 Nobel Prize in Physics: Canadian Arthur B. McDonald shares win with Japan's Takaaki Kajita".  
  4. ^ "About ICRR". Institute for Cosmic Ray Research, University of Tokyo. 
  5. ^ a b c Randerson, James and Ian Sample (6 October 2015). "Kajita and McDonald win Nobel physics prize for work on neutrinos".  
  6. ^ Overbye, Dennis (6 October 2015). "Takaaki Kajita and Arthur McDonald Share Nobel in Physics for Work on Neutrinos".  
  7. ^ "The Nobel Prize in Physics 2015".. Nobel Media AB 2014. Web. 6 October 2015.

External links

  • Official website
  • Panofsky Preis
  • Verleihung des Julius Wess Preises 2013 mit Vortrag von Kajita
  • KAGRA, the Latest "Gravitational Wave Telescope" Project, Commences via JST Science News 2012
  • Takaaki Kajita Quotes With Pictures
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