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Hideki Yukawa won the 1949 Nobel Prize in Physics for predicting that a particle called a meson could carry the force binding protons and neutrons inside an atomic nucleus. He was the first Japanese recipient of a Nobel Prize. Yukawa made a theoretical prediction; later experiments supplied evidence for mesons.
What did Hideki Yukawa predict?
Atomic nuclei contain positively charged protons and neutrons. The electromagnetic repulsion between protons should push them apart, so physicists needed to explain what could hold the nucleus together. Yukawa addressed this problem by proposing that nuclear forces, like other forces, could be described through a field and transmitted by a particle.
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In his Nobel lecture on December 12, 1949, Yukawa wrote: “The meson theory started from the extension of the concept of the field of force so as to include the nuclear forces in addition to the gravitational and electromagnetic forces.” In plain terms, he extended the field-based way of describing familiar forces to the interaction inside nuclei. His theory linked the force’s very short range to an exchange particle with substantial mass.
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In 1934, Yukawa estimated that particle’s mass at about 200 times the electron’s mass and called it a “meson,” as the Nobel Prize account explains. This was a theoretical estimate, not a modern measurement of one specific meson.
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How was the theory supported by experiments?
Yukawa’s prediction and the experimental discoveries that followed are related but distinct events. The University of Osaka’s biography of Yukawa says a particle with the predicted meson mass was discovered in 1937. It separately credits Cecil Powell with experimentally discovering, in 1947, a meson that mediated nuclear force—evidence that verified Yukawa’s theory.
The distinction matters: Yukawa did not discover the particle in an experiment. His achievement was to predict a force-carrying particle from a theoretical account of nuclear forces; later experimental work connected mesons with the force he was trying to explain.
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Why did Yukawa win the Nobel Prize?
The 1949 Nobel Prize in Physics recognized Yukawa “for his prediction of the existence of mesons on the basis of theoretical work on nuclear forces.” The award was for the prediction, not for personally finding a meson in a laboratory. The Nobel record lists Kyoto University and Columbia University as his affiliations at the time of the prize.
Kyoto University’s Yukawa Institute history describes him as the first Japanese citizen to receive a Nobel Prize. That wording identifies his place in Japan’s Nobel history; it does not mean he was the first Asian Nobel laureate.
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Yukawa’s life and academic career
Yukawa was born in Tokyo on January 23, 1907, and died in Kyoto on September 8, 1981, according to the Nobel Prize biography. He studied physics at Kyoto Imperial University, graduating in 1929. The University of Osaka’s chronology records that he worked at Osaka Imperial University from 1933 to 1939 and became a professor at Kyoto Imperial University in 1939. These historical names reflect the institutions as they were called at the time.
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Following the Nobel recognition, Yukawa Hall opened in 1952, and the Research Institute for Fundamental Physics was established in 1953; it later became the Yukawa Institute for Theoretical Physics, according to the Institute’s history.
On September 16, 2026, the Institute announced that Yukawa’s historical documents at the Yukawa Hall Archival Library had received certification under the inaugural Japan Physics Heritage program. The collection includes calculation notebooks, manuscript drafts and laboratory records, offering a record of his working process and the development of Japan’s academic research system after the war. The announcement is available from the Yukawa Institute.
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Further reading on Yukawa
- Tabibito (The Traveler) is Yukawa’s autobiography, published in 1982. Google Books describes it as an account of his early years that includes his original meson-theory paper: bibliographic record.
- Kyoto University Press lists a Japanese-language book, 新編 素粒子の世界を拓く, placing Yukawa and Tomonaga’s work in the broader history of particle physics: publisher listing.
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