The Klein-Nishina formula, derived in 1928, provided a crucial mathematical description of incoherent scattering. This work marked the career of the physicist who established modern nuclear research in Japan. Beyond this contribution to theoretical physics, he managed laboratory infrastructure, directed national wartime atomic energy initiatives, and mentored two future Nobel Laureates throughout the mid-twentieth century.
Academic Foundations and European Research
Born in 1890 in Satosho, Yoshio Nishina completed his studies as an electrical engineer at the University of Tokyo in 1918, where he received a silver watch for graduating at the top of his class. He began his career as a staff member at the Institute of Physical and Chemical Research, known as RIKEN, under Hantaro Nagaoka. By 1921, he embarked on a research tour of European institutions, including the Cavendish Laboratory and the University of Göttingen. During his time at the University of Copenhagen, he formed a lasting professional relationship with Niels Bohr, which eventually led to his collaboration with Oskar Klein on scattering theory.
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Returning to Japan in 1929, he sought to advance the study of quantum mechanics. In 1931, he founded the Nishina Laboratory at RIKEN. He acted as a catalyst for international collaboration by inviting scholars such as Heisenberg, Dirac, and Bohr to Japan. In 1931, he conducted lectures on Dirac theory in Kyoto, facilitating his introduction to Hideki Yukawa and Sin-Itiro Tomonaga. His experimental work included particle accelerator development and the construction of cyclotrons at RIKEN. His investigations into cosmic rays led to the independent detection of the muon. Additionally, he discovered the uranium-237 isotope and conducted studies on symmetric fission phenomena during 1939 and 1940.
Wartime Responsibilities and Postwar Recovery
During World War II, he served as the leader of the Japanese nuclear weapon program. On August 7, 1945, he headed a scientific mission to Hiroshima to determine the nature of the explosion, confirming it was an atomic device by the following day. Following the war, US occupation forces dismantled his cyclotrons on November 22, 1945. Despite being initially targeted for purging, he received support from American physicist Harry C. Kelly, who advocated for his retention due to his international standing. He eventually became the head of the reorganized RIKEN, where he focused on acquiring radio isotopes for nonmilitary research and preserving the institution's scientific mandate.
Fast facts
- Born: 1890, Satosho
- Died: 1951, Tokyo
- Education: University of Tokyo
- Awards: Asahi Prize (1944), Order of Culture (1946)
- Notable students: Hideki Yukawa, Sin-Itiro Tomonaga
- Burial site: Tama Cemetery
- Major collaboration: Klein-Nishina formula
- Membership: Japan Academy
Questions readers ask
What was the significance of the Klein-Nishina formula?
It provided a theoretical explanation for incoherent or Compton scattering, developed alongside Oskar Klein in 1928.
Did Nishina participate in the Japanese atomic bomb project?
Yes, he was the head of the Japanese nuclear weapon program during World War II.
What happened to his research equipment after the war?
His cyclotrons were dismantled by US occupation forces on November 22, 1945, and the components were disposed of in Tokyo Bay.
Achievements
- Educated at University of Tokyo
- Fields of research: nuclear physics
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