Robert Hofstadter

Robert Hofstadter (1915–1990) was an American physicist who used high-energy electron scattering to measure nuclear charge distributions and won the 1961 Nobel Prize in Physics.

Electron scattering: The deflection of electrons by matter through electromagnetic interactions, used to probe its structure. Hofstadter inferred nuclear charge distributions from how electrons scattered off atomic nuclei.
Stanford University: A private research university in Stanford, California, founded in 1885. Hofstadter conducted his landmark electron-scattering research at Stanford.
Richard Hofstadter: An American historian and public intellectual known for studies of political traditions in the United States. The shared surname can obscure that the historian was Robert Hofstadter’s brother.
Nuclear physics: The study of atomic nuclei, their constituents, and the forces and reactions involving them. Hofstadter’s measurements supplied direct experimental constraints on nuclear models.
Form factor (particle physics): A function describing how a particle’s internal structure modifies its response to a probe. Nuclear form factors encoded the spatial charge distributions measured in Hofstadter’s scattering data.
Mark III linear accelerator: A Stanford electron linear accelerator that supplied beams for early nuclear-scattering experiments. Its high-energy electrons enabled Hofstadter to probe nuclear dimensions.
Jerome I. Friedman: An American physicist who shared the 1990 Nobel Prize for experiments revealing quarks inside protons and neutrons. Friedman’s later scattering experiments extended the method Hofstadter had established.
Nuclear shell model: A model describing nucleons as occupying quantized energy levels within an atomic nucleus. Measured nuclear distributions provided evidence and tests for descriptions of nuclear structure.
Nuclear charge radius: A measure of the spatial extent of a nucleus’s positive charge distribution. His scattering measurements established nuclear charge radii with unprecedented precision.
Ernest Lawrence: An American physicist who invented the cyclotron and led major nuclear research programs. Lawrence’s accelerator-centered research environment shaped Hofstadter’s early scientific career.

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