Jack Steinberger coauthored the experiment establishing a distinction between the muon neutrino and electron neutrino. A beam produced through meson decays generated predominantly muons in the detector rather than the expected electron showers for a single common neutrino type. Comparing the two interaction signatures made lepton identity experimentally testable.[ref]
Observation of High-Energy Neutrino Reactions and the Existence of Two Kinds of Neutrinos by G. Danby and others. 1962, beam preparation and observed muon reactions compared with electron-like events
An experimental physicist who conducted neutrino-scattering research at CERN and was the first ALEPH spokesperson.[ref]
Professional profile of Jack Steinberger. Independent professional identity
Portrait of Jack Steinberger
. Sigismund von Dobschütz, 23 July 2008. CC BY-SA 3.0, via Wikimedia Commons. Source.
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