Kōichirō Nishikawa (Template:Lang-ja, born 1949) is a Japanese elementary particle physicist, known for contributions to neutrino physics. He is professor emeritus of the KEK high-energy physics laboratory and the University of Kyōto.
Nishikawa graduated from the University of Kyōto in 1971 and completed his doctorate at Northwestern in 1980 working with David Buchholz. After working at the University of Chicago, State University of New York, and the University of Tōkyō, he combined positions at KEK and the University of Kyōto, eventually becoming director of the Institute for Particle and Nuclear physics at the KEK laboratory and deputy director of the J-PARC proton accelerator facility.[1][2]
Nishikawa was spokesman for the K2K experiment, which ran from 1999 until 2005. K2K used the Super Kamiokande detector in Kamioka to measure a controlled beam of neutrinos emitted by the KEK proton synchrotron. The K2K team verified with greater accuracy the neutrino oscillations observed in atmospheric neutrinos by the Super Kamiokande experiment.[3] The T2K experiment, which began in 2010, used neutrino beams from the J-PARC proton accelerator with the Super Kamiokande detector to observe neutrino oscillations with specific start and end flavors, thereby measuring the parameters of this flavor-switching behavior.[4]
In 2016, Nishikawa and the K2K and T2K groups received the Breakthrough Prize in Fundamental Physics together with other neutrino research collaborations.[5] He was awarded the Nishina Memorial Prize in 2005,[6] and the Bruno Pontecorvo Prize in 2016.[7] He also received the 1998 Asahi Prize as part of the Super-Kamiokande experiment that discovered the mass of neutrinos.[8]
References
- ^ "Nishikawa, Koichiro - Profile". INSPIRE-HEP. Retrieved 20 September 2018.
- ^ "2011 at KEK, Annual Report". KEK. Retrieved 20 September 2018.
- ^ "Synthetic neutrinos appear to disappear". CERN Courier. 17 October 2000. Retrieved 20 September 2018.
- ^ Parke, Stephen J. (18 July 2011). "Viewpoint: A new neutrino oscillation". Physics. 4. Retrieved 20 September 2018.
- ^ "Breakthrough Prize – Fundamental Physics Breakthrough Prize Laureates – Koichiro Nishikawa and the K2K and T2K Collaboration". Breakthrough Prize. 1 October 2016. Retrieved 20 September 2018.
- ^ "Nishina Memorial Prize". nishina-mf.or.jp. 18 December 2013. Retrieved 20 September 2018.
- ^ "Koichiro Nishikawa wins 2016 Pontecorvo Prize". t2k-experiment.org. 1 March 2017. Retrieved 20 September 2018.
- ^ The Asahi Shimbun Company. "The Asahi Prize - English Information". The Asahi Shimbun Company. Retrieved 20 September 2018.
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