Background
Nishijima, Kazuhiko was born on October 4, 1926 in Tsuchiura, Japan. Son of Ayao and Koko (Hirose) Nishijima.
西島 和彦
Theoretical physicist university professor
Nishijima, Kazuhiko was born on October 4, 1926 in Tsuchiura, Japan. Son of Ayao and Koko (Hirose) Nishijima.
He obtained his diploma in physics at the University of Tokyo in 1948, and his Doctor of Philosophy from Osaka University in 1955 for his thesis on the nuclear potential.
He was professor emeritus at the University of Tokyo and Kyoto University until his death in 2009. He is most well known for his work on the Gell-Mann–Nishijima formula, and the concept of strangeness, which he called the "eta-charge" or "η-charge", after the eta meson (η). In 1950, while at Osaka University, Nishijima was hired by Yoichiro Nambu to work on the theory of strong interactions and of strange particles (then called V particles).
While studying the decay of these particles, Nishijima developed, with Tadao Nakano, and independently of Murray Gell-Mann, a formula that would relate the quantum numbers of these particles, the Gell-Mann–Nishijima formula (or sometimes the NNG formula, for Nishijima, Nakano, and Gell-Mann). where Q is the electric charge, I3 is the isospin projection, B is the baryon number, and South is the strangeness quantum number of the particle.
This formula was pivotal for the later development of the quark model by Gell-Mann and George Zweig in 1964 (independently of each other). From 1956 to 1958, Nishijima worked in Göttingen, Germany, upon the invitation of Werner Heisenberg.
In 1958, he moved to the United States and joined the Institute for Advanced Study in Princeton, New Jersey. A year and a half later, he became a professor at the University of Illinois at Urbana–Champaign.
In 1966, he returned to the University of Tokyo, where he founded a theoretical physics research group and served in some administrative positions.
Nishijima kept active in research until near the end of his life. His last subjects of research were color confinement and noncommutative quantum field theory. He died of leukemia on 15 February 2009 at the age of 82.
Member of Japan Academy of Sciences, German Academy Leopoldina, Russian Academy of Sciences.
Married Hideko Yamura, November 7, 1954. 1 child Fuyuhiko.