Robert Hofstadter
American physicist, Nobel laureate for electron scattering studies.
Robert Hofstadter, an American physicist, was born in New York City to Polish Jewish immigrants; his father worked as a salesman, and his mother was Henrietta Koenigsberg. He attended local schools and graduated magna cum laude from City College of New York at age 20, winning the Kenyon Prize in Mathematics and Physics. A fellowship from General Electric allowed him to pursue graduate studies at Princeton, where he earned his M.S. and Ph.D. by age 23; his dissertation examined infrared absorption by light and heavy formic and acetic acids. After postdoctoral work at the University of Pennsylvania and a stint as an assistant professor at Princeton, he joined Stanford University in 1950, teaching there until 1985. In 1942, he married Nancy Givan of Baltimore; they had three children, including Pulitzer Prize winner Douglas Hofstadter.
Hofstadter shared the 1961 Nobel Prize in Physics with Rudolf Mössbauer for his pioneering work on electron scattering in atomic nuclei, which led to discoveries about the structure of nucleons. In 1948, he patented a thallium-activated sodium iodide detector for ionizing radiation, a device still widely used for gamma ray detection. He also coined the term "fermi" (symbol fm) in a 1956 paper in *Reviews of Modern Physics*, honoring physicist Enrico Fermi; the unit became standard in nuclear and particle physics and appeared in his 1961 Nobel lecture. Late in his career, Hofstadter turned to astrophysics, contributing his knowledge of scintillators to the design of the EGRET gamma-ray telescope on the Compton Gamma Ray Observatory; Stanford credits him as a principal scientist behind that observatory.
He was elected to the National Academy of Sciences in 1958, the American Academy of Arts and Sciences in 1970, and the American Philosophical Society in 1986. He received the Golden Plate Award from the American Academy of Achievement in 1984. Stanford hosts an annual Robert Hofstadter Memorial Lecture series, with one talk for the public and another for scientists. The popular TV sitcom *The Big Bang Theory* reportedly named its character Leonard Hofstadter after him.
- born
- February 5, 1915
- died
- November 17, 1990
- field
- Physics
- nationality
- American
- known_for
- Pioneering studies of electron scattering in atomic nuclei, discoveries concerni
Verified Timeline
Lore & Background
degree magna cum laude in 1935 and earned his M.S. and Ph.D. from Princeton University at age 23. His doctoral dissertation was on infrared absorption by light and heavy formic and acetic acids. He did post-doctoral research at the University of Pennsylvania and was an assistant professor at Princeton before joining Stanford University, where he taught from 1950 to 1985. In 1948 Hofstadter filed a patent for a thallium-activated sodium iodide gamma ray detector, which remains widely used. Stanford University credits him as one of the principal scientists who developed the observatory.
Reader's Guide
Robert Hofstadter's significance lies in his foundational contributions to nuclear and particle physics through electron scattering experiments, which revealed the structure of nucleons (protons and neutrons) and earned him the 1961 Nobel Prize. His invention of the thallium-activated sodium iodide detector revolutionized gamma ray detection and remains a standard tool. By coining the fermi unit, he provided a convenient scale for nuclear dimensions. Hofstadter's work bridged experimental technique and fundamental discovery, influencing generations of physicists.
Did You Know?
- Robert Hofstadter shared the 1961 Nobel Prize in Physics with Rudolf Mössbauer.
- He coined the term 'fermi' (symbol fm) in a 1956 paper, in honor of Enrico Fermi.
- Hofstadter filed a patent for a thallium-activated sodium iodide gamma ray detector in 1948.
- His son Douglas Hofstadter won a Pulitzer Prize.
- He contributed to the design of the EGRET gamma-ray telescope of the Compton Gamma Ray Observatory.
Frequently Asked Questions
Who is Robert Hofstadter?
Robert Hofstadter was an American physicist best known for his groundbreaking work on electron scattering to probe the internal structure of atomic nuclei. He shared the 1961 Nobel Prize in Physics with Rudolf Mössbauer for those contributions.
What did Robert Hofstadter win the 1961 Nobel Prize for?
The Nobel committee recognized him for his pioneering electron-scattering experiments that revealed how nucleons (protons and neutrons) are structured inside the nucleus. His findings opened a new window into subnuclear matter that had previously been difficult to access.
What is the 'fermi' unit and who coined it?
The fermi is a unit of length equal to one femtometer (10⁻¹⁵ m), commonly used to express nuclear-scale distances. Hofstadter is credited with coining the term in honor of Enrico Fermi.
What detector did Robert Hofstadter invent?
He developed a thallium-activated sodium iodide crystal detector for measuring gamma rays. This scintillation detector became a widely used tool in nuclear and particle physics experiments throughout the mid-20th century.
When was Robert Hofstadter born and when did he die?
Hofstadter was born on February 5, 1915, and passed away on November 17, 1990. He spent the bulk of his career at Stanford University, where he conducted most of his Nobel-winning research.
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