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Portrait of Jack Steinberger
Photo: Sigismund von Dobschütz, Own work · CC BY-SA 3.0 via Wikimedia Commons

Nobel Prize in Physics · 1988

Jack Steinberger

Sent out of Nazi Germany at 13, he helped turn ghostly neutrinos into a beam and showed that matter's lightest particles come in families.

The Nobel citation: “for the neutrino beam method and the demonstration of the doublet structure of the leptons through the discovery of the muon neutrino”
Born
May 25, 1921, Bad Kissingen, Germany
Died
December 12, 2020, Geneva, Switzerland
Affiliation at the time
CERN, Switzerland

Physics prize

1988

Shared with 2 other laureates.

Age that year

67years

Born in 1921.

Sources cited

18

Fact-checked September 24, 2026.

  • At 13 he left Nazi Germany with his older brother on the SS Washington in 1934, one of 300 German refugee children placed in American homes by Jewish charities.
  • The 1962 neutrino experiment hid its detector behind a 13.5-metre wall of steel from scrapped warships. Only neutrinos could get through.
  • He gave his Nobel medal to New Trier High School near Chicago, the school he attended after arriving in America as a young refugee.
  • Bad Kissingen, the town he fled as a boy, named its high school after him in 2001 and made him an honorary citizen in 2006.
  • In 1950 he left Berkeley, partly because he declined to sign the university's anticommunist loyalty oath.

The breakthrough

The neutrino beam and the discovery of the muon neutrino (1962)

Neutrinos are ghostly particles with no electric charge. They pass through almost anything: a single neutrino could cross a wall of lead light-years thick without hitting a thing. By the late 1950s physicists faced a puzzle. Measurements of how muons decay, including Steinberger's own, did not fit the accepted theory. Muons are heavier cousins of the electron. Theorists suggested a way out: maybe there were two different kinds of neutrino. At Columbia University, Melvin Schwartz proposed making a beam of neutrinos to test this. He, Leon Lederman and Steinberger spent two years working out how. At Brookhaven's new AGS accelerator, protons struck a beryllium target and made pions, which decayed in flight into muons and neutrinos. A 13.5-metre wall of steel from scrapped warships stopped everything except the neutrinos. Behind it sat a 10-ton spark chamber, a stack of aluminium plates. When a rare neutrino hit a nucleus, the charged particle it made left a trail of sparks. If only one kind of neutrino existed, the hits should make electrons as often as muons. They made only muons. Think of two keys cut for two locks: the neutrino born alongside a muon opens only the muon's door. So the muon has its own neutrino, and the light particles called leptons come in paired families.[1],[2],[3],[11]

“The experience of trying to find a job as a twenty-year-old boy without connections was the most depressing I was ever to face.”
Jack Steinberger, From the autobiography he wrote for the Nobel Foundation in 1988, recalling the Depression years in Chicago after his scholarship ran out.[1]

What it meant for humanity

The muon neutrino did not cure a disease or power a machine. Its gift was understanding, plus a new tool. Before 1962, the weak force could only be studied through radioactive decay, at low energies. The Columbia team turned the neutrino into a probe, and the Royal Swedish Academy of Sciences compared neutrino beams to X-rays: just as X-rays show a skeleton, neutrinos show the hard parts inside a proton. The tool soon paid off. In 1973 the Gargamelle bubble chamber at CERN, sitting in a neutrino beam, found weak neutral currents, a key prediction of the theory that unites the electromagnetic and weak forces. The CDHS detector at CERN, which Steinberger co-founded, a 1,200-tonne stack of magnetized iron, then gave the first precise and correct measurement of the Weinberg angle, a basic constant of that theory. It also mapped the quarks inside protons and neutrons and supported quantum chromodynamics, the theory of the strong force. The idea that leptons come in families grew too. In the 1980s he led the ALEPH collaboration, one of four detectors at CERN's LEP collider. Together, LEP's experiments proved that there are three, and only three, generations of matter particles. Neutrino beams remain central to physics. Fermilab's Deep Underground Neutrino Experiment will fire the world's most intense neutrino beam 1,300 kilometres through the Earth to South Dakota, partly to learn whether neutrinos explain why the universe is made of matter. His life also carried a human story. Bad Kissingen, the town that drove his family out, later honored him, and his visits became what a local paper called an example of reconciliation.

  • In 1973 the Gargamelle bubble chamber at CERN, exposed to a neutrino beam, found weak neutral currents, a key prediction of the electroweak theory that joined the electromagnetic and weak forces.[4],[12]
  • The CDHS neutrino experiment he co-founded at CERN (1977-1983) gave the first precise and correct measurement of the Weinberg angle and supported the quark model of the proton and quantum chromodynamics.[1],[5]
  • He led ALEPH, one of the four detectors at CERN's LEP collider, as spokesperson through the 1980s. LEP's measurements proved there are three, and only three, generations of matter particles.[1],[5],[13]
  • In the 1950s his Columbia group helped make bubble chambers practical: fast recompression let them cycle quickly, and extra stereo cameras, used in all later chambers, allowed computerized analysis.[1]
  • Fermilab's DUNE experiment will send the world's most intense neutrino beam 1,300 km to South Dakota to study whether neutrinos explain why the universe is made of matter.[14],[15]
  • From 1989 he returned often to Bad Kissingen, mentored students at the school named after him, and became an honorary citizen in 2006, a story of reconciliation with the town his family fled.[6],[8]

Impact in numbers

Steinberger's work produced knowledge and research tools, not products, so we record no numerical claims; any lives-saved or dollar figure would be invented. The 1962 experiment showed that the electron and the muon each have their own neutrino, the root of today's picture of matter particles grouped in families. The neutrino beam it introduced became a standard probe: it revealed weak neutral currents at CERN in 1973, and his CDHS experiment used it to measure the Weinberg angle precisely and to map quarks inside the nucleon. His earlier work helped establish the neutral pion and helped make bubble chambers practical, and ALEPH, which he led, helped LEP show that there are exactly three generations of matter. Neutrino beams now drive large projects such as DUNE, which asks why the universe contains matter at all. His later visits to Bad Kissingen, the town his family fled, became what a local paper called an example of reconciliation.

Fundamental science

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

We found no documented harm from the muon-neutrino discovery or from neutrino beams, which have no military use. Two caveats are worth stating. During World War II, as an Army recruit, he worked in the antenna group of the MIT Radiation Laboratory, which was developing radar bomb sights. His role was junior, and we make no numerical claim for it, but he later said he felt a share of responsibility for civilian deaths in Allied night bombing. Credit is the second caveat. The 1962 experiment was done by a team that also included G. Danby, J.M. Gaillard, K. Goulianos and N. Mistry, and the Nobel Prize named only three of them.

  • Minor

    Wartime work on radar bomb sights

    After Pearl Harbor he joined the Army and was sent to the MIT Radiation Laboratory, which was developing radar bomb sights. He worked in the antenna group for two years. His part was junior and no specific harm can be traced to it, but he later said the work gave him some responsibility for civilian deaths in night bombing raids, and he called raids such as Dresden's unjust.[1],[5],[6]

  • Minor

    A seven-person experiment, three Nobel laureates

    The Nobel press release lists G. Danby, J.M. Gaillard, K. Goulianos and N. Mistry as members of the Columbia group that did the 1962 experiment. Only Schwartz, Lederman and Steinberger shared the prize.[1],[3]

Against the odds

Steinberger grew up in a modest cantor's household in a Bavarian spa town during Germany's post-war depression. As he entered his teens, the Nazis rose to power. He remembered election posters showing a hateful caricature of a Jewish face and SA storm troopers marching by torchlight while singing about Jewish blood. After 1933, laws pushed Jewish children out of higher education in public schools, and a national quota capped 'non-Aryans' at 1.5 percent of school and university admissions. In 1934 American Jewish charities offered homes to 300 German refugee children. His father applied, and at Christmas 1934 Jack, 13, and his older brother sailed for New York. A Chicago grain broker, Barnett Faroll, took him in and helped bring his parents and younger brother over before the war, so the family escaped the Holocaust. Many of those who stayed did not: none of the 23 Jews deported from Bad Kissingen in April 1942 survived. In Chicago the family ran a small delicatessen on a very thin income. When his scholarship ran out during the Depression, he washed laboratory glassware for 18 dollars a week and studied chemistry at night. Later, in 1950, he left Berkeley partly because he declined to sign an anticommunist loyalty oath.

  • 1933

    Persecution

    As a boy in Bad Kissingen he saw Nazi election posters caricaturing Jews and SA torchlight parades with songs about Jewish blood. After the Nazis took power in 1933, systematic persecution of Jews followed quickly.[1]

  • 1933

    Quota

    In 1933 German laws restricted Jewish students, including a 1.5 percent quota on 'non-Aryan' admissions to public schools and universities. Steinberger wrote that Jewish children were shut out of higher education in public schools.[1],[10]

  • 1934

    Exile

    At 13 he was sent to the United States with his older brother Herbert through a program run by American Jewish charities for 300 German refugee children. They sailed on the SS Washington at Christmas 1934.[1],[5],[6]

  • 1941

    Poverty

    His refugee family lived on a very marginal income from a small Chicago delicatessen. When his scholarship ended during the Depression, he washed chemical apparatus for 18 dollars a week and studied at night.[1]

  • 1942

    Persecution

    Context: the Jews who remained in his hometown were deported in 1942. None of the 23 deported from Bad Kissingen to the Izbica area in April 1942 survived; most of 18 elderly Jews sent to Theresienstadt also died.[7]

  • 1950

    Other

    He stayed only a year at Berkeley, partly because he declined to sign the University of California's anticommunist loyalty oath, and moved to Columbia University in 1950.[1],[5]

Jewish background

Both parents JewishDistant from Jewish identity

Steinberger was born into a Jewish family in Bad Kissingen, Bavaria. His father, Ludwig, served the town's small Jewish community as cantor and religious teacher from the age of 18 until he emigrated. His mother, Bertha (born May), was the daughter of a Nuremberg hop merchant, Moritz May, and Rosa May (born Rosenstein). Bad Kissingen's memorial book of its Jewish residents gives each parent an entry, and the family was persecuted as Jews and fled to the United States. As an adult he was secular: he has been described as an atheist and humanist, and he was named a laureate of the International Academy of Humanism. From 1989 he rebuilt close ties with his hometown.[1],[6],[8],[16],[17],[18]

Key dates

  1. May 25, 1921

    Born Hans Jakob Steinberger in Bad Kissingen, Bavaria, the son of Ludwig Steinberger, cantor and religious teacher of the town's Jewish community.[1],[2],[6]

  2. December 1934

    At 13, leaves Nazi Germany with his older brother on the SS Washington, bound for New York; a Chicago family takes him in.[1],[6]

  3. 1938

    Graduates from New Trier High School; with his parents and younger brother now in America, the family is reunited in Chicago, beyond the reach of the Holocaust.[1],[9],[18]

  4. 1942

    Finishes a chemistry degree at the University of Chicago, joins the Army and is sent to the MIT Radiation Laboratory.[1],[5]

  5. 1948

    Earns his PhD under Enrico Fermi at Chicago with a cosmic-ray experiment showing that the muon decays into three particles.[1],[5]

  6. 1950

    After helping establish the neutral pion at Berkeley, he leaves, partly over the loyalty oath, and joins Columbia University.[1],[5]

  7. 1962

    With Schwartz, Lederman and colleagues, uses the first high-energy neutrino beam at Brookhaven to discover the muon neutrino.[3],[11]

  8. 1968

    Joins CERN in Geneva, where he studies CP violation in neutral kaons.[1],[5]

  9. 1977

    The CDHS neutrino detector he helped found starts taking data at CERN's SPS, running until 1983.[1],[5]

  10. 1986

    Retires from CERN and becomes a professor at the Scuola Normale Superiore in Pisa, while continuing research at CERN.[1],[5]

  11. October 19, 1988

    Shares the Nobel Prize in Physics with Leon Lederman and Melvin Schwartz; the same year he receives the US National Medal of Science. He later gives his Nobel medal to New Trier High School.[2],[3],[5],[9]

  12. 1989

    CERN's LEP collider starts up with ALEPH, the detector collaboration he led as spokesperson; the same year he first revisits Bad Kissingen.[1],[5],[6]

  13. 2001

    On his 80th birthday, Bad Kissingen names its gymnasium (academic high school) the Jack-Steinberger-Gymnasium.[5],[6],[8]

  14. December 12, 2020

    Dies in Geneva at 99.[2],[5],[8]

Sources

  1. 1.Jack Steinberger - Biographical (with addendum, June 2005) · NobelPrize.org (from Nobel Lectures, Physics 1981-1990, World Scientific, 1993), 1988
  2. 2.Jack Steinberger - Facts · NobelPrize.org (Nobel Prize Outreach)
  3. 3.The Nobel Prize in Physics 1988 - Press release (19 October 1988) · Royal Swedish Academy of Sciences / NobelPrize.org, 1988
  4. 4.Experiments with High-Energy Neutrino Beams (Nobel Lecture, 8 December 1988) · NobelPrize.org, 1988
  5. 5.Jack Steinberger 1921-2020 (obituary) · CERN Courier, 2021
  6. 6.Biographical memorial book of the Jews of Bad Kissingen: Steinberger family entry · Biografisches Gedenkbuch der Bad Kissinger Juden (Stadt Bad Kissingen)
  7. 7.Deportation (historical information) · Biografisches Gedenkbuch der Bad Kissinger Juden (Stadt Bad Kissingen)
  8. 8.Physik-Nobelpreisträger Jack Steinberger ist gestorben · inFranken.de (Saale-Zeitung), 2020
  9. 9.New Trier alumni recall their high school years (12 October 2000) · Chicago Tribune, 2000
  10. 10.Antisemitic Legislation 1933-1939 · United States Holocaust Memorial Museum, Holocaust Encyclopedia
  11. 11.Nobel Prizes at Brookhaven · Brookhaven National Laboratory
  12. 12.The discovery of the weak neutral currents · CERN Courier, 2004
  13. 13.The Large Electron-Positron Collider · CERN
  14. 14.LBNF/DUNE: Deep Underground Neutrino Experiment · Fermi National Accelerator Laboratory
  15. 15.Deep Underground Neutrino Experiment (DUNE) · DUNE Collaboration
  16. 16.International Academy of Humanism · Council for Secular Humanism
  17. 17.Jack Steinberger · Wikipedia
  18. 18.Biographical memorial book of the Jews of Bad Kissingen: Bertha Steinberger (née May) entry · Biografisches Gedenkbuch der Bad Kissinger Juden (Stadt Bad Kissingen)

Fact-checked on September 24, 2026 by a separate AI fact-checking pass that re-opened the sources, with 9 corrections made. How we check

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