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Masatoshi Koshiba

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Title: Masatoshi Koshiba  
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Subject: List of Nobel laureates by university affiliation, Takaaki Kajita, Riccardo Giacconi, Wolf Prize in Physics, Nobel Prize in Physics
Collection: 1926 Births, Alexander Von Humboldt Fellows, Commanders Crosses of the Order of Merit of the Federal Republic of Germany, Fellows of Bangladesh Academy of Sciences, Foreign Members of the Russian Academy of Sciences, Japanese Nobel Laureates, Japanese Physicists, Living People, Nobel Laureates in Physics, People from Toyohashi, Aichi, Recipients of the Order of Culture, Recipients of the Order of the Rising Sun, University of Tokyo Alumni, University of Tokyo Faculty, Winners of the Panofsky Prize, Wolf Prize in Physics Laureates
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Masatoshi Koshiba

Masatoshi Koshiba
Born (1926-09-19) September 19, 1926
Toyohashi, Aichi, Japan
Nationality Japan
Fields Physics
Institutions University of Chicago
University of Tokyo
Tokai University
Alma mater University of Tokyo
University of Rochester
Doctoral advisor Morton F. Kaplon
Other academic advisors Takahiko Yamanouchi
Doctoral students Yoji Totsuka
Other notable students Takaaki Kajita
Known for Astrophysics, neutrinos
Notable awards Humboldt Prize (1997)
Wolf Prize in Physics (2000)
Nobel Prize in Physics (2002)

Masatoshi Koshiba (小柴 昌俊 Koshiba Masatoshi, born on September 19, 1926 in Toyohashi, Aichi) is a Japanese physicist. He jointly won the Nobel Prize in Physics in 2002.

He graduated from the University of Tokyo in 1951 and received a Ph.D. in physics at the University of Rochester, New York, in 1955. From July 1955 to February 1958 he was Research Associate, Department of Physics, University of Chicago; from March 1958 to October 1963, he was Associate Professor, Institute of Nuclear Study, University of Tokyo, although from November 1959 to August 1962 he was on leave from the above as Senior Research Associate with the honorary rank of Associate Professor and as the Acting Director, Laboratory of High Energy Physics and Cosmic Radiation, Department of Physics, University of Chicago. At the University of Tokyo he became Associate Professor in March 1963 and then Professor in March 1970 in the Department of Physics, Faculty of Science, and Emeritus Professor there in 1987. From 1987 to 1997, Koshiba taught at Tokai University. In 2002, he jointly won the Nobel Prize in Physics "for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos". (The other shares of that year's Prize were awarded to Raymond Davis Jr. & Riccardo Giacconi of the U.S.A.)[1]

He is now Senior Counselor of International Center for Elementary Particle Physics (ICEPP) and Emeritus Professor of University of Tokyo.

Koshiba's award-winning work centred on neutrinos, subatomic particles that had long perplexed scientists. Since the 1920s it had been suspected that the Sun shines because of nuclear fusion reactions that transform hydrogen into helium and release energy. Later, theoretical calculations indicated that countless neutrinos must be released in these reactions and, consequently, that Earth must be exposed to a constant flood of solar neutrinos. Because neutrinos interact weakly with matter, however, only one in a trillion is stopped on its way to Earth. Neutrinos thus developed a reputation as being undetectable.

In the 1980s, Koshiba, drawing on the work done by Raymond Davis Jr, constructed an underground neutrino detector in a zinc mine in Japan. Called Kamiokande II, it was an enormous water tank surrounded by electronic detectors to sense flashes of light produced when neutrinos interacted with atomic nuclei in water molecules. Koshiba was able to confirm Davis's results—that the Sun produces neutrinos and that fewer neutrinos were found than had been expected (a deficit that became known as the solar neutrino problem). In 1987 Kamiokande also detected neutrinos from a supernova explosion outside the Milky Way. After building a larger, more sensitive detector named Super-Kamiokande, which became operational in 1996, Koshiba found strong evidence for what scientists had already suspected—that neutrinos, of which three types are known, change from one type into another in flight; this resolves the solar neutrino problem, since early experiments could only detect one type, not all three.

In 2003, he was awarded the Benjamin Franklin Medal in Physics.

Koshiba is a member of the Board of Sponsors of The Bulletin of the Atomic Scientists.

He is a foreign fellow of Bangladesh Academy of Sciences [2]

In commemoration of the Nobel Prize-winning by Masatoshi Koshiba, Koshiba hall was established at the University of Tokyo.[3]


  • Publications 1
  • See also 2
  • References 3
  • See also 4
  • External links 5


  • Koshiba, M.; Fukuda, Y; et al. (1998). "Evidence for Oscillation of Atmospheric Neutrinos".  
  • Koshiba, M.; Fukuda, Y; et al. (1999). "Constraints on Neutrino Oscillation Parameters from the Measurement of Day-Night Solar Neutrino Fluxes at Super-Kamiokande".  

See also


  1. ^ The Nobel Prize in Physics 2002.
  2. ^ List of Fellows of Bangladesh Academy of Sciences Archived November 7, 2009 at the Wayback Machine
  3. ^ 寺崎昌男 2007 『東京大学の歴史 大学制度の先駆け』 講談社

See also

External links

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