Skip to content
Nobel Jews
Portrait of Igor Y. Tamm
Photo: Nobel foundation, http://nobelprize.org/nobel_prizes/physics/laureates/1958/tamm-bio.html · Public domain via Wikimedia Commons

Nobel Prize in Physics · 1958

Igor Y. Tamm

He explained the blue glow of particles outrunning light in water, a key to modern detectors, and co-proposed the tokamak for fusion.

The Nobel citation: “for the discovery and the interpretation of the Cherenkov effect”
Born
July 8, 1895, Vladivostok, Russia
Died
April 12, 1971, Moscow, USSR (now Russia)
Shared with
Pavel A. Cherenkov, Il´ja M. Frank
Affiliation at the time
Lomonosov Moscow State University, Russia; P.N. Lebedev Physical Institute, Russia

Disputed inclusion. Sources disagree on whether this laureate meets our standard of at least one Jewish parent. The evidence is set out under Jewish background below. We count this laureate by default, and the methodology page shows how the results change without disputed cases.

Physics prize

1958

Shared with 2 other laureates.

Age that year

63years

Born in 1895.

Headline credited impact

$14.2–16billion in economic value

Cumulative world semiconductor sales, a proxy for the quantum-based electronics economy. How it was built

Sources cited

29

Fact-checked September 24, 2026.

  • With Ilya Frank he explained the blue glow given off when particles outrun light in water. Detectors built on that light caught the neutrino clues behind the 2015 physics Nobel.
  • In the early 1950s he and his student Andrei Sakharov proposed the tokamak, a doughnut-shaped magnetic bottle adopted worldwide as the most promising design for magnetic fusion.
  • A family history says his father, an engineer in Elisavetgrad, once walked alone into an anti-Jewish pogrom mob armed only with a cane and drove it off.
  • At the secret H-bomb center in 1951 he and two colleagues openly protested when a devout Jewish mathematician, ordained a rabbi at 15, was ordered out within 24 hours.
  • A paralysed diaphragm kept him on a breathing machine for his last three years, yet he kept doing physics, moving between one machine at his bed and one at his desk.

The breakthrough

The theory of Cherenkov radiation, light's version of a sonic boom

In 1933-34 Pavel Cherenkov, a young graduate student working under Sergei Vavilov at the Soviet Academy of Sciences, noticed a faint blue glow in liquids struck by radiation from radium. It did not behave like ordinary fluorescence. It appeared even in doubly distilled water, and it came from fast electrons knocked loose by the radiation. Physicists had long been taught that a charge moving at a steady speed cannot give off light, so the glow was a puzzle. In 1937 Tamm and Ilya Frank solved it. Light travels more slowly inside water or glass than in empty space, and a very fast electron can outrun it there without breaking Einstein's rule, which only forbids beating light's speed in a vacuum. The electron then trails a cone of light, the way a speedboat faster than its own waves leaves a V-shaped wake, or a supersonic jet makes a sonic boom. Tamm and his colleagues nicknamed the effect 'the singing electrons', after the hiss of a supersonic shell. Their formulas gave how much energy the particle sheds as light and at what angle, and that angle reveals the particle's speed. In his Nobel lecture Tamm admitted that at first even he and Frank had tried to square their correct result with the old textbook rule. Detectors built on the effect helped find the antiproton in 1955 and became standard tools at particle accelerators.[1],[3],[4],[5]

“The phenomenon could have been easily predicted on the basis of classical electrodynamics many decades before its actual discovery.”
Igor Y. Tamm, Tamm's Nobel lecture, 11 December 1958, on why Cherenkov radiation was discovered so late.[3]

What it meant for humanity

Tamm and Frank's theory turned a curious glow into one of physics' most useful measuring tools. Because Cherenkov light leaves at an angle set by a particle's speed, detectors can pick out fast particles one at a time and clock them. Such counters helped discover the antiproton in 1955. Giant versions now hunt neutrinos: Japan's Super-Kamiokande, a tank of 50,000 tonnes of ultra-pure water lined with more than 11,000 light sensors, used Cherenkov flashes to show that neutrinos change identity, work honoured with the 2015 Nobel Prize. Inspectors from the International Atomic Energy Agency use a digital Cherenkov viewer to check spent nuclear fuel stored under water without moving it. Hospitals have begun filming the faint Cherenkov glow given off by a patient's tissue during radiotherapy; at two US centres it flagged problems needing action in 15% of 1,196 treatment plans. Tamm's other ideas spread widely too. In 1930 he treated the vibrations of a crystal as particles, later named phonons. Colleagues count this as the first example of a quasiparticle, now an everyday tool in the physics of solids, plasmas and nuclei. In 1932 he predicted special electron states at the surface of a crystal, which became important in surface physics and microelectronics. His 1934 idea that nuclear forces come from exchanging particles pointed Hideki Yukawa toward the meson. With Andrei Sakharov he proposed the tokamak, now adopted worldwide as the most promising design for magnetic fusion and the basis of the international ITER project, although none yet supplies electricity. He also built a school of theorists: Sakharov called him his teacher, as did Vitaly Ginzburg, the 2003 physics laureate. And he used his standing to fight Lysenko's pseudo-science in biology.

  • Cherenkov detectors, built on the effect Frank and Tamm explained, helped discover the antiproton in 1955 and let Super-Kamiokande's 50,000-tonne water tank show that neutrinos change identity, the discovery honoured by the 2015 Nobel Prize.[4],[20]
  • For years IAEA safeguards inspectors have used a digital Cherenkov viewing device, improved with help from member states' support programmes, to check spent nuclear fuel stored under water in seconds, without moving it.[21]
  • Filming Cherenkov light from patients during radiotherapy, two US centres found deviations needing action in 15% of 1,196 treatment plans; 1.8% needed partial or full replanning.[22]
  • Colleagues say his 1932 prediction of electron states at a crystal's surface later proved important for transistors. Bardeen's Nobel lecture, which does not name Tamm, says the transistor came out of research on semiconductor surfaces and surface states.[5],[8],[23]
  • With Sakharov he proposed confining hot plasma in a doughnut-shaped magnetic trap, the tokamak, now adopted worldwide as the most promising design for magnetic fusion and the basis of the ITER project.[12],[18],[19]
  • He trained a school of theorists that included Andrei Sakharov and Vitaly Ginzburg, and used his authority to fight Lysenko's attacks on genetics.[5],[11],[12],[13]

Impact in numbers

Most of Tamm's legacy cannot be counted: the Cherenkov detectors that underpin particle and neutrino physics and help verify nuclear fuel, the quasiparticle idea, surface-state physics, the exchange-force idea that led to Yukawa's meson, the tokamak concept behind today's fusion experiments, and a school of theorists that included Sakharov and Ginzburg. We record one small ripple claim. His 1932 prediction of electron surface states is an early link in the chain that led to the transistor, so we credit him 0.1% of cumulative world semiconductor sales, using the same whole-outcome range as the Bohr, Einstein, Bloch, Born, Pauli and Landau profiles. We make no claim for fusion, which has not yet produced power for the grid, or for Cherenkov detectors, whose value lies in knowledge and safety rather than a countable total. We record no numeric harm claim: the thermonuclear device he helped design was never used in war, and although fallout from its 1953 test exposed thousands of villagers, no reliable count of people harmed exists. Those harms are described in words above.

Fundamental scienceTechnologyEnergyHealthEducationEconomy

Each number is the laureate’s credited share of a real-world outcome, cumulative to 2025. The whole outcome, the share of credit, and the reasoning are shown so you can check the arithmetic. Outcomes shared with other laureates are counted once on the impact page.

  • Low confidenceRippleModeledEconomy

    Cumulative world semiconductor sales, a proxy for the quantum-based electronics economy

    $14.2–16

    billion in economic value, credited share

    That is 0.1% of $14.2–16 trillion in economic value since 1955.

    How this number was built

    Same whole-outcome range as the Bohr and Einstein profiles. WSTS semiconductor billings for 1986-2025 sum to $10.28 trillion nominal; converting each year with the Minneapolis Fed CPI table gives about $14.2 trillion in 2024 dollars (low). High ($16T): $14.2T + rough, unsourced allowances of ~$0.5T for pre-1986 chip sales and ~$1T for lasers and other quantum devices outside WSTS = ~$15.7T, rounded up. Share 0.001: Tamm's 1932 paper first predicted electron states bound to a crystal surface, which Feinberg and Kirzhnits say became important for transistor physics, and Bardeen's Nobel lecture says the transistor came out of a research program on semiconductor surfaces and surface states. But Bardeen's own 1947 surface-state theory guided that work, and chips needed all of quantum theory plus decades of engineering, so the share is half Landau's 0.002. Credited: about $14-16 billion.[5],[8],[23],[24],[25]

    Sources: Physics-Uspekhi (Uspekhi Fizicheskikh Nauk); Priroda (Russian Academy of Sciences), via the Rosatom History electronic library; NobelPrize.org; World Semiconductor Trade Statistics (WSTS); Federal Reserve Bank of Minneapolis

The double edge

Tamm helped build the Soviet hydrogen bomb. In 1948 he was put in charge of a Lebedev Institute group studying thermonuclear weapons, and within about two months his students Sakharov and Ginzburg proposed two key ideas behind the first Soviet design, a 'layer cake' of fusion fuel and uranium. From 1950 he led the theorists at the secret Arzamas-16 weapons center, co-signed the final design report in June 1953, and attended the test of 12 August 1953, a blast of about 400 kilotons at Semipalatinsk in Kazakhstan. He received a Stalin Prize and the title Hero of Socialist Labour. Soviet thermonuclear weapons were never used in war, but the program fed the arms race. Tamm helped read weather data to time the test so that fallout would miss populated areas. Even so, villages had to be evacuated, and about 191 residents of Karaul could not leave before the radioactive cloud arrived. In 1968 he signed a protest against the Soviet invasion of Czechoslovakia, then withdrew his signature; Sakharov later wrote that he regretted the withdrawal.

  • Major

    Leader of the first Soviet hydrogen-bomb theorists

    From 1948 Tamm headed the Lebedev Institute group whose members Sakharov and Ginzburg devised the two key ideas behind the 'layer cake' design, and from 1950 to 1953 he led the theory division at Arzamas-16. He co-signed the final report on the device, tested on 12 August 1953 with a yield of about 400 kilotons, and was honoured with a Stalin Prize and the title Hero of Socialist Labour.[5],[9],[14],[15]

  • Moderate

    Fallout from the 1953 thermonuclear test

    Residents of villages near the Semipalatinsk site were moved before and after the test, but about 191 people in Karaul could not evacuate before the cloud arrived. A 2026 dose-reconstruction study estimated external doses averaging 52 mGy for 6,804 of its participants, from seven villages, who were exposed to this test. Over 40 years the site hosted 456 nuclear explosions in all.[5],[16],[17]

  • Minor

    A withdrawn protest

    Already gravely ill, Tamm signed a letter protesting the 1968 Soviet invasion of Czechoslovakia, then withdrew his signature. Sakharov said a student had urged him to protect his department; Tamm told Kirzhnits he doubted a protest after the fact would help. Sakharov regretted the withdrawal; Kirzhnits regretted instead the pressure put on a dying man.[11]

Against the odds

The record does not show Tamm facing antisemitism himself; his dangers came from Stalin's political terror. He grew up in Elisavetgrad, Ukraine, where Jews made up 39% of the population in 1897. The wave of pogroms that swept southern Russia in the 1880s began there in April 1881, and in October 1905, when Tamm was ten, a state-sponsored pogrom killed 11 Jews. According to the family history, his father, the city engineer, once walked alone into a pogrom mob with only a cane and scattered it. Stalin's Great Terror took people close to him. His younger brother Leonid, an engineer, was arrested in 1936, made to 'confess' to sabotage at a show trial, and shot. His school friend Boris Hessen was shot in 1936, and his student Semyon Shubin was arrested in 1937 and died in custody in 1938. Tamm, a Menshevik in 1917, was denounced at meetings for failing to unmask them, refused to disown anyone, and was pressed to give up his university chair. Branded a 'bourgeois idealist', he was kept out of the main atomic work until 1948 and struck from the 1946 Academy elections by the party ideologist Andrei Zhdanov. At the secret weapons center in 1951 he and two colleagues openly protested when the Jewish mathematician M. M. Agrest, a deeply religious man ordained as a rabbi at 15, was ordered out within 24 hours.

  • 1905

    Other

    Not an attack on Tamm himself: he grew up in Elisavetgrad, where the 1881 wave of pogroms began and where a state-sponsored pogrom in October 1905, when he was ten, killed 11 Jews. The family history says his father once faced down a pogrom mob alone.[6],[26]

  • 1936

    Family killed

    His younger brother Leonid, a chemical engineer in the Donbas, was arrested in 1936 and appeared as a 'witness' at a show trial, 'confessing' to sabotage. Feinberg and Ginzburg say he was shot, and Gorelik dates his death to 1937; in a 1950 form Tamm wrote that his brother had died in custody in 1942.[5],[7],[9],[10],[13]

  • 1937

    Persecution

    After his school friend Boris Hessen was shot, Tamm was denounced at Lebedev Institute meetings in February and April 1937 for 'loss of vigilance' and for not exposing his brother and Hessen. A week after the April meeting he learned that his student Semyon Shubin had been arrested; Shubin died in custody in 1938.[5],[10],[29]

  • 1937

    Dismissal

    On 2 March 1937 Moscow University's rector urged him to resign as head of the theoretical physics chair, and he did. The theoretical department he had built at the Lebedev Institute was dissolved and only quietly restored after 1943.[7],[10]

  • 1944

    Persecution

    His father and sister Tatiana, who had stayed in German-occupied Kyiv, were charged in 1944 with having been ethnic Germans under the occupation; his sister spent three months under arrest before the charges were dropped.[6],[9]

  • 1946

    Discrimination

    Branded a 'bourgeois idealist' and marked by his Menshevik past, he was kept out of the main Soviet atomic work until 1948, and in 1946 Andrei Zhdanov personally struck his name from the list for election to full Academy membership.[5],[7],[10],[13]

Jewish background

Basis unclearRelationship to Jewish identity not documented

We found no reliable evidence that either parent was Jewish. A genealogy compiled by his grandson traces his father's line to Theodor Tamm, who came to Russia from Thuringia in Germany in the 1860s, and his mother's to the Davydov family, which came from Georgia in 1666, and to Zaporozhian Cossacks; it names no Jewish ancestor. Under Nazi occupation his father was classed as an ethnic German. Wikipedia's list, which our site follows, includes him on the word of reference books, such as a Who's Who of Nobel winners that gives his religion as Jewish. The Encyclopaedia Judaica also has an entry on him. No source we read shows him identifying as Jewish.[6],[9],[27],[28]

Key dates

  1. July 8, 1895

    Born in Vladivostok, where his father, an engineer, was working on the Trans-Siberian Railway. The family soon settles in Elisavetgrad, Ukraine.[1],[6]

  2. 1913

    Finishes school and spends a year at the University of Edinburgh; his parents hoped distance would keep him out of revolutionary politics.[5],[7],[14]

  3. 1917

    As a Menshevik-Internationalist, serves as a delegate from Elisavetgrad to the First All-Russian Congress of Soviets; marries Natalia Shuiskaya in September.[5],[6],[10]

  4. 1930

    Treats the vibrations of a crystal as particle-like 'sound quanta', later named phonons, which colleagues count as the first quasiparticle.[5],[8]

  5. 1932

    Predicts electron states bound to the surface of a crystal, now called Tamm states.[5],[8]

  6. 1934

    Becomes head of the theoretical division of the Lebedev Physical Institute, and proposes that nuclear forces arise from particle exchange.[2],[8]

  7. 1936

    His brother Leonid is arrested and his school friend Boris Hessen is shot in Stalin's purges.[5],[9],[10]

  8. 1937

    Denounced at meetings, he is pressed to resign as head of Moscow University's theoretical physics chair.[10]

  9. 1937

    With Ilya Frank, publishes the theory that explains Cherenkov radiation.[1],[4],[5]

  10. 1948

    Put in charge of a Lebedev Institute group on the hydrogen bomb that includes his students Andrei Sakharov and Vitaly Ginzburg.[5],[12]

  11. 1950

    Moves to the secret weapons center Arzamas-16 to lead its theorists; with Sakharov starts Soviet work on magnetic fusion, the tokamak idea.[5],[9],[12],[18]

  12. August 12, 1953

    Attends the first Soviet thermonuclear test at Semipalatinsk; the same year he becomes a full member of the Academy of Sciences.[2],[7],[9],[14],[15]

  13. 1958

    Shares the Nobel Prize in Physics with Pavel Cherenkov and Ilya Frank for the discovery and interpretation of the Cherenkov effect.[1]

  14. April 12, 1971

    Dies in Moscow after three years on a breathing machine, working almost to the end.[1],[11]

Sources

  1. 1.Igor Y. Tamm - Facts · NobelPrize.org (Nobel Prize Outreach)
  2. 2.Igor Y. Tamm - Biographical · NobelPrize.org (from Nobel Lectures, Physics 1942-1962, Elsevier, 1964), 1964
  3. 3.General characteristics of radiations emitted by systems moving with super-light velocities with some applications to plasma physics (Nobel Lecture, 11 December 1958) · NobelPrize.org, 1958
  4. 4.The Nobel Prize in Physics 1958 - Presentation speech by Professor K. Siegbahn · NobelPrize.org, 1958
  5. 5.Igor' Evgen'evich Tamm, by E. L. Feinberg (Physics-Uspekhi 38, 773-789) · Physics-Uspekhi (Uspekhi Fizicheskikh Nauk), 1995
  6. 6.Rodoslovnaya [I. E. Tamma] (Tamm family genealogy), compiled by L. I. Vernsky, in Priroda 1995 no. 7, pp. 6-11 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  7. 7.Sud'ba rossiiskogo intelligenta (The fate of a Russian intellectual), by E. L. Feinberg, Priroda 1995 no. 7, pp. 12-22 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  8. 8.Vekhi nauchnogo tvorchestva (Milestones of scientific work), by D. A. Kirzhnits, Priroda 1995 no. 7, pp. 24-27 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  9. 9.Glazami fizikov Arzamasa-16 (Through the eyes of Arzamas-16 physicists), by Yu. B. Khariton, V. B. Adamsky, Yu. A. Romanov and Yu. N. Smirnov, Priroda 1995 no. 7, pp. 86-96 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  10. 10.Tragicheskaya polosa (A tragic stretch), by G. E. Gorelik, Priroda 1995 no. 7, pp. 110-117 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  11. 11.Poslednie gody (The last years), by D. A. Kirzhnits, Priroda 1995 no. 7, pp. 69-78 (in Russian) · Priroda (Russian Academy of Sciences), via the Rosatom History electronic library, 1995
  12. 12.Andrei Sakharov - Biographical · NobelPrize.org, 1975
  13. 13.Vitaly L. Ginzburg - Biographical · NobelPrize.org, 2003
  14. 14.Igor Evgenievich Tamm · GlobalSecurity.org
  15. 15.Soviet Hydrogen Bomb Program · Atomic Heritage Foundation / National Museum of Nuclear Science & History, 2014
  16. 16.External radiation dose reconstruction among individuals exposed to fallout from atmospheric nuclear weapons testing at the Semipalatinsk Nuclear Test Site, by V. Drozdovitch et al. (Journal of Environmental Radioactivity) · PubMed Central (US National Library of Medicine), 2026
  17. 17.UN News special report: 'Ground Zero' at the former Semipalatinsk nuclear test site in Kazakhstan · UN News (United Nations), 2019
  18. 18.August 1968: A revolution in fusion, by Robert Arnoux · ITER Organization (ITER Newsline), 2008
  19. 19.What is a tokamak? · ITER Organization
  20. 20.The Nobel Prize in Physics 2015 - Popular information · NobelPrize.org (Royal Swedish Academy of Sciences), 2015
  21. 21.The International Atomic Energy Agency's Experience Verifying Spent Fuel Using the Digital Cerenkov Viewing Device, by C. Orton et al. (INMM Annual Meeting proceedings, abstract) · Institute of Nuclear Materials Management (INMM), 2017
  22. 22.Clinical implementation and impact of real-time Cherenkov imaging for treatment verification and patient safety in radiation therapy, by A. Robinson and M. Tallhamer (Physics and Imaging in Radiation Oncology 39:100997) · PubMed Central (US National Library of Medicine), 2026
  23. 23.Semiconductor research leading to the point contact transistor (Nobel Lecture), by John Bardeen · NobelPrize.org, 1956
  24. 24.Historical Billings Report (WSTS Blue Book monthly data, 1986 to date) · World Semiconductor Trade Statistics (WSTS), 2026
  25. 25.Consumer Price Index, 1913- · Federal Reserve Bank of Minneapolis
  26. 26.Kirovograd (Encyclopaedia Judaica, 2nd ed.) · Encyclopedia.com (Gale), 2007
  27. 27.Tamm, Igor Yevgenyevich, by Michel Denman (Encyclopaedia Judaica, 2nd ed.) · Encyclopedia.com (Gale), 2007
  28. 28.List of Jewish Nobel laureates · Wikipedia, 2026
  29. 29.Shubin Semen Petrovich (1908): record of arrest (24 April 1937), sentence and death in custody (November 1938) (in Russian) · Otkrytyi spisok (Open List database of victims of Soviet political repression)

Open questions flagged on September 24, 2026 by a separate AI fact-checking pass that re-opened the sources, with 8 corrections made. How we check

Suggest a correction