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Portrait of Burton Richter
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Nobel Prize in Physics · 1976

Burton Richter

He built the collider that caught the psi particle, proof of a fourth quark, and let its X-rays out to serve biology and materials science.

The Nobel citation: “for their pioneering work in the discovery of a heavy elementary particle of a new kind”
Born
March 22, 1931, Brooklyn, NY, USA
Died
July 18, 2018, Stanford, CA, USA
Shared with
Samuel C.C. Ting
Affiliation at the time
Stanford Linear Accelerator Center, USA

Physics prize

1976

Shared with 1 other laureate.

Age that year

45years

Born in 1931.

Sources cited

22

Fact-checked September 24, 2026.

  • His team found the psi particle around 10 November 1974. It appeared at just one of more than a thousand collision energies the machine could be tuned to.
  • A Ting team member recalls that in November 1974 Ting told Richter he had interesting physics to tell him. Richter replied with the same words.
  • Congress would not fund his collider, SPEAR. After years of rejections he cut costs, paid for it from the lab's running budget, and his team built it in about 21 months.
  • Two Stanford colleagues asked him to add a port to let SPEAR's X-rays out. He did, creating the first modern synchrotron light source, a prototype for many others.
  • His public high school in Far Rockaway, Queens, counts three Nobel laureates among its former students: Richard Feynman, Baruch Blumberg and Richter himself.

The breakthrough

Colliding beams and the discovery of the psi (J/psi) particle, 1974

In the early 1970s physicists thought that protons, neutrons and their many cousins were built from three kinds of quarks. Theorists had long predicted a fourth, called charm, but there was no direct evidence. Richter came at the problem as a machine builder. Rather than firing a beam at a fixed target, he made two beams meet head-on, which frees far more energy for making new particles, much as two cars colliding head-on release more energy than one car hitting a parked car at the same speed. At Stanford he built SPEAR, a ring in which electrons and their antimatter twins, positrons, circle in opposite directions and collide. When the two annihilate, their energy briefly becomes a tiny fireball that can turn into new particles. Around 10 November 1974 his team, working with Berkeley physicists, tuned the collision energy to about 3.1 billion electron volts. Particle production shot up at that one setting and nowhere else, like a radio that suddenly blares when the dial hits a single station. They named the new particle psi. Samuel Ting's MIT team, working at Brookhaven National Laboratory, had independently found it, calling it J. It was about three times as heavy as a proton, yet lived about a thousand times longer than expected. Ten days later Richter's team found a second, heavier psi. Their experiments over the next two years showed these were a charm quark bound to its antiquark, and in 1976 they found D mesons, particles that carry charm itself.[2],[3],[4],[5],[12],[13]

“Nothing so strange and completely unexpected had happened in particle physics for many years.”
Burton Richter, From the opening of his Nobel lecture, Stockholm, 11 December 1976, describing how the announcement of the new particle in November 1974 struck physicists.[4]

What it meant for humanity

Richter's discovery changed textbooks rather than daily life. The psi showed that a fourth quark, charm, really exists, and within two years his team had found charmed particles directly. SLAC says entire physics textbooks had to be rewritten. His National Academy of Sciences memoir says these and other SPEAR discoveries, including Martin Perl's discovery of a third electron-like particle, were fundamental to establishing the Standard Model, today's theory of the known particles and forces except gravity. The electron storage rings he built with Gerard O'Neill and colleagues from 1958 were, in his words, the ancestor of all later colliding-beam storage rings. His 1975-76 study of how such rings scale with energy became, by his own account, the first-order design of CERN's 27-kilometre LEP collider. As SLAC's director he oversaw the SLAC Linear Collider, the first and so far only linear collider. The most practical spin-off came almost by accident. While SPEAR was being built, two Stanford physicists persuaded him to add a port so the X-rays thrown off by the circling particles could escape. It became the first modern synchrotron radiation facility and a prototype for many others. Now the Stanford Synchrotron Radiation Lightsource, running on an upgraded ring, it serves about 1,700 scientists a year, who publish about 700 papers annually; SSRL says research there helped develop products from advanced computer chips to the flu drug Tamiflu. As director, Richter also started turning SLAC's accelerator into an X-ray laser, a plan the physicist Helen Quinn called the world's first. Later he wrote a plain-language guide to climate and energy choices, and as head of the International Union of Pure and Applied Physics he set up its working group on women in physics.

  • The psi and the charmed D mesons found at SPEAR proved that a fourth quark exists. With Martin Perl's third charged lepton, found with the same detector, these results were fundamental to establishing the Standard Model.[4],[5],[7]
  • The X-ray port he paid to add to SPEAR created the first modern synchrotron light source. Now the Stanford Synchrotron Radiation Lightsource, it serves about 1,700 scientists a year, who publish about 700 papers annually.[1],[6],[11]
  • The Princeton-Stanford storage rings he helped build from 1958 were, in his words, the ancestor of all later colliding-beam rings, and he says his 1975-76 scaling study became the first-order design of CERN's 27-km LEP collider.[1],[4]
  • As SLAC director (1984-1999) he oversaw completion of the SLAC Linear Collider, the first and so far only linear collider. Its accelerator research underpins plans for future, far more energetic linear colliders.[1],[5],[6]
  • As president of the International Union of Pure and Applied Physics he set up a Working Group on Women in Physics. Its first international conference, in Paris in 2002, drew 300 physicists from 65 countries.[10]

Impact in numbers

Richter's Nobel work changed understanding, not daily life: it showed that a fourth quark exists and helped establish the Standard Model of particle physics. We attach no number to that. His practical legacy runs through the machines he built or championed. Head-on colliding beams became the standard design for particle accelerators, and the X-ray port he added to SPEAR made it the first modern synchrotron light source, the model for many facilities now used to map protein structures, study bacteria and viruses, and improve fuel and solar cells. We make no quantified claim for that either. Its benefits flow through thousands of research groups and many other essential contributors, and we found no published estimate that isolates what SPEAR's example added. His energy-policy writing and advisory work informed public debate but have no measurable outcome we could credit to him. Zero claims is the honest count.

Fundamental scienceTechnologyEnergy

No number is given here on purpose. Some contributions cannot be counted honestly, and we would rather describe them than invent a figure.

The double edge

No harms are documented from Richter's discoveries, which concern the basic makeup of matter. Two points belong on the record. He was a member of JASON, an independent group of scientists that advises the US government on defense science and technology. And in later life he publicly backed nuclear power as part of the answer to climate change. He chaired a Department of Energy subcommittee on the nuclear fuel cycle from 2000 to 2013, and in 2013 he welcomed an open letter by four climate scientists backing nuclear power, describing it as telling Germany's chancellor she was wrong to shut down her country's reactors. Critics such as the Natural Resources Defense Council argue that nuclear power carries too many safety problems and costs too much. These are policy positions, not proven harms, so we attach no numbers.

  • Minor

    Advice on defense science (JASON)

    Richter was a member of JASON, an independent group of scientists founded in 1960 that advises the US government on matters of defense science and technology. The sources we found do not describe which studies he worked on.[5],[8]

  • Minor

    Advocacy for nuclear power

    He sat on the Department of Energy's Nuclear Energy Advisory Committee and chaired its fuel cycle subcommittee from 2000 to 2013. In 2013 he praised climate scientists who urged a larger role for nuclear power; the Natural Resources Defense Council countered that nuclear power has too many safety issues and too high a price.[9],[22]

Against the odds

Richter's own path shows American opportunity more than persecution, and we found no record of antisemitism aimed at him. He was born in Brooklyn in 1931, during the Great Depression, the elder child of a textile worker, and grew up in Far Rockaway, Queens. The America of his childhood was not free of prejudice. The US Holocaust Memorial Museum notes that antisemitism was common and grew through the 1930s, and that the 1924 immigration quotas disadvantaged people from eastern Europe, where most of Europe's Jews lived. In higher education, Columbia, Harvard and Yale had begun around 1920 to limit how many Jews they admitted, using devices such as interviews and 'geographic diversity' that were meant to cut the number of Jewish New Yorkers. According to the writer Mark Oppenheimer, those schools did not admit many more Jews until the 1960s. Richter was schooled at Far Rockaway High School and at Mercersburg Academy in Pennsylvania, and entered MIT in 1948; no source says he was turned away anywhere. His hardest fight was for money, not acceptance. Congress would not fund SPEAR, the collider he proposed in the mid-1960s. After years of rejections he cut its cost and built it from SLAC's operating budget. Less than three years after its first beams collided, it produced the discovery that won him the Nobel Prize.

  • 1931

    Discrimination

    He was born into a country where, according to the US Holocaust Memorial Museum, antisemitism was common and grew through the 1930s, and where 1924 immigration quotas favored northern and western Europeans over the eastern Europeans among whom most of Europe's Jews lived.[1],[19]

  • 1948

    Quota

    When he left high school in 1948, some elite universities still used admissions devices, such as interviews and 'geographic diversity', invented around 1920 to limit Jewish New Yorkers. He entered MIT; no source says he was rejected elsewhere.[1],[13],[18],[20]

  • 1970

    Other

    His proposal for SPEAR, submitted in 1965, went unfunded for about five years; Congress would not pay for it. He redesigned it to cut costs and won approval in 1970 to build it from the laboratory's operating funds, without congressional approval.[4],[5],[6]

Jewish background

Both parents JewishRelationship to Jewish identity not documented

Richter was born in Brooklyn, the elder child of Abraham and Fanny (Pollack) Richter; his father was a textile worker. Wikipedia, citing Baruch Shalev's reference book 100 Years of Nobel Prizes, says he was born into a Jewish family. The Encyclopaedia Judaica has an entry on him, and he appears on the Jewish Nobel laureate lists of the Jewish Virtual Library and the Israel Science and Technology Directory. We found no record of religious observance or of public statements by him about being Jewish. The JTA's 1976 coverage of that year's prizes named Friedman, Blumberg and Bellow as Jewish American winners but did not mention Richter.[1],[13],[14],[15],[16],[17]

Key dates

  1. March 22, 1931

    Born in Brooklyn, New York, the elder child of Abraham and Fanny Richter; he grows up in Far Rockaway, Queens.[1],[2],[5]

  2. 1948

    After Far Rockaway High School and Mercersburg Academy in Pennsylvania, enters MIT, undecided between chemistry and physics.[1],[13],[18]

  3. 1956

    Completes his MIT PhD on the production of pi-mesons by light, then moves to Stanford's High-Energy Physics Laboratory.[1],[4]

  4. 1958

    With Gerard O'Neill and others, begins building the Princeton-Stanford storage rings, among the first colliding-beam machines.[1],[4]

  5. 1960

    Marries Laurose Becker; they have two children, Elizabeth and Matthew.[1]

  6. 1963

    Moves to the new Stanford Linear Accelerator Center (SLAC) to design an electron-positron collider, later named SPEAR.[1],[4]

  7. 1970

    After about five years without funding, SPEAR is approved and built in some 21 months; the Mark I detector starts taking data in February 1973.[4],[5]

  8. November 11, 1974

    Richter's SLAC-Berkeley team and Samuel Ting's MIT team at Brookhaven announce the same new particle, the psi or J, evidence for a fourth quark.[3],[7],[12]

  9. 1976

    Shares the Nobel Prize in Physics with Samuel Ting; the same year his collaboration finds D mesons, particles carrying charm.[2],[4]

  10. 1984

    Becomes director of SLAC, serving until 1999; under his leadership the SLAC Linear Collider is completed and work on an X-ray laser begins.[1],[5],[8]

  11. 1994

    Serves as president of the American Physical Society; later president of the International Union of Pure and Applied Physics (1999-2002).[10],[13]

  12. 2010

    Publishes Beyond Smoke and Mirrors: Climate Change and Energy in the 21st Century, a guide for general readers.[5],[21]

  13. 2014

    Receives the National Medal of Science from President Obama, after the Enrico Fermi Award in 2012.[8],[9]

  14. July 18, 2018

    Dies at Stanford, California, aged 87.[2],[5]

Sources

  1. 1.Burton Richter - Biographical (autobiography provided by the laureate, May 2005) · NobelPrize.org (Nobel Prize Outreach), 2005
  2. 2.Burton Richter - Facts · NobelPrize.org (Nobel Prize Outreach)
  3. 3.The Nobel Prize in Physics 1976 - Press release (Royal Swedish Academy of Sciences) · NobelPrize.org, 1976
  4. 4.From the Psi to Charm: The Experiments of 1975 and 1976 (Nobel Lecture, 11 December 1976) · NobelPrize.org (from Nobel Lectures, Physics 1971-1980, World Scientific, 1992), 1976
  5. 5.Burton Richter, 1931-2018: A Biographical Memoir, by Persis Drell, Vera Luth and Maury Tigner · National Academy of Sciences, 2022
  6. 6.Burton Richter (1931-2018): Physicist who helped to discover the first particle containing a charm quark, by Helen Quinn (Nature 560: 554) · Nature, 2018
  7. 7.SLAC celebrates 50 years of Nobel-winning discovery in particle physics · SLAC National Accelerator Laboratory, 2024
  8. 8.Burton Richter (Past SLAC Directors and Deputy Directors) · SLAC National Accelerator Laboratory
  9. 9.SLAC Director Emeritus and Nobelist Burton Richter to Receive National Medal of Science · SLAC National Accelerator Laboratory, 2014
  10. 10.Burton Richter, 1931-2018 (SLAC history biography page, with colleagues' recollections including Judy Franz on APS and IUPAP) · SLAC Archives, History and Records Office
  11. 11.About Our Research Facility (Stanford Synchrotron Radiation Lightsource) · SLAC National Accelerator Laboratory
  12. 12.Discovery of a Narrow Resonance in e+e- Annihilation, by J.-E. Augustin et al. (Phys. Rev. Lett. 33: 1406), INSPIRE-HEP record · INSPIRE-HEP, 1974
  13. 13.Burton Richter (Encyclopedia of World Biography; Encyclopaedia Judaica entry 'Richter, Burton') · Encyclopedia.com (Gale)
  14. 14.Burton Richter · Wikipedia
  15. 15.Burton Richter · Jewish Virtual Library (American-Israeli Cooperative Enterprise)
  16. 16.Jewish Nobel Prize Laureates in Physics · Israel Science and Technology Directory
  17. 17.Bellow Wins 1976 Nobel Prize · Jewish Telegraphic Agency, 1976
  18. 18.Museum Tracks Down FRHS Nobel Laureates, by Howard Schwach · The Wave (Rockaway, Queens), 2005
  19. 19.How did the United States government and American people respond to Nazism? (Holocaust Encyclopedia) · United States Holocaust Memorial Museum
  20. 20.How the Ivy League's Jewish quotas shaped higher education (interview with Mark Oppenheimer by Susan H. Greenberg) · Inside Higher Ed, 2022
  21. 21.Beyond Smoke and Mirrors: Climate Change and Energy in the 21st Century, by Burton Richter · Cambridge University Press, 2010
  22. 22.Environmental scientists tout nuclear power to avert climate change · CNN, 2013

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

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