= Spencer Klein
{c}
{tag=Physicist}
= S. R. Klein
{c}
{synonym}
An experimental <particle physicist> who coauthors the Particle Data Group review of particle passage through matter with <Donald E. Groom>. It relates <energy loss>, <multiple scattering> and radiation processes to the signals and limitations of particle detectors. The same relations let an experimenter estimate whether a charged track will be detectable, stopped or significantly deflected.<Passage of Particles Through Matter by Donald E. Groom and Spencer Klein>[Sections 34.2–34.4: stopping, multiple scattering and photon/electron interactions]{ref}
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