Nobel Prizes and Laureates

Nobel Prizes and Laureates

The Nobel Prize in Physics 1965
Sin-Itiro Tomonaga, Julian Schwinger, Richard P. Feynman

Share this:

Sin-Itiro Tomonaga - Facts

Sin-Itiro Tomonaga

Sin-Itiro Tomonaga

Born: 31 March 1906, Kyoto, Japan

Died: 8 July 1979, Tokyo, Japan

Affiliation at the time of the award: Tokyo University of Education, Tokyo, Japan

Prize motivation: "for their fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles"

Field: quantum electrodynamics, quantum mechanics

Prize share: 1/3


Following the establishment of the theory of relativity and quantum mechanics, an initial relativistic theory was formulated for the interaction between charged particles and electromagnetic fields. The theory had to be reformulated, however, partly due to the observation of the Lamb shift in 1947, in which the supposed single energy level within a hydrogen atom was instead proven to be two similar levels. Sin-Itiro Tomonga solved this problem in 1948 through a "renormalization" and thereby contributed to a new quantum electrodynamics.

Share this:
To cite this page
MLA style: "Sin-Itiro Tomonaga - Facts". Nobel Media AB 2014. Web. 26 Feb 2017. <>