= Robert Hofstadter
{c}
{tag=Physicist}
{title2=1915–1990}
{wiki}
= R. Hofstadter
{c}
{synonym}
<Robert Hofstadter> investigated nuclear <charge distributions> through energetic <electron scattering>. His 1956 review compares $400\,\mathrm{MeV}$ <electrons> scattered from <helium> gas with predictions for point charges and several extended charge profiles. Beyond about $70^\circ$, the elastic <scattering> was over a hundred times smaller than the point-charge prediction. The extracted <nuclear charge form factor> distinguishes candidate spatial profiles, connecting measured angular counts with a model of nuclear size and shape.<Electron Scattering and Nuclear Structure by Robert Hofstadter>[pp. 237–238, Figs. 32–33, helium angular distribution and alternative charge-profile fits]{ref}
A <physicist>.https://physics.stanford.edu/people/robert-hofstadter[Independent professional profile]{ref}
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{title=Portrait of <Robert Hofstadter>}
{description=Nobel Foundation, 1961 Nobel portrait; individual photographer unspecified. Public domain in Sweden according to the Commons Swedish-photograph template. https://commons.wikimedia.org/wiki/File:Robert_Hofstadter.jpg[Source usage terms], via Wikimedia Commons.}
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