Nishikawa graduated from Kyōto University in 1971 and completed his doctorate at Northwestern in 1980 working with David Buchholz [Wikidata].
[3] K2K, which ran from 1999 until 2005, used the Super Kamiokande detector in Kamioka to measure a controlled beam of neutrinos emitted by the KEK proton synchrotron.
[4] The T2K experiment, which began in 2010 as a successor to K2K, 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.
[5] In 2016, Nishikawa and the K2K and T2K groups received the Breakthrough Prize in Fundamental Physics together with other neutrino research collaborations.
[8] He also received the 1998 Asahi Prize as part of the Super-Kamiokande experiment that discovered the mass of neutrinos.