European Muon Collaboration
The European Muon Collaboration (EMC) conducted high energy particle physics experiments at CERN. In 1983, it discovered that nucleons inside a nucleus have a different distribution of momentum among their component quarks. This is the original so-called EMC Effect.
In 1987, the group discovered that only a small part of the proton spin is carried by quarks, and that the strange quark sea is probably polarized. The former is sometimes referred to as the "proton spin crisis".
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