Proton

Proton spin crisis

The proton spin crisis (sometimes called the "proton spin puzzle") is a theoretical crisis precipitated by an experiment in 1987 which tried to determine the spin configuration of the proton. The experiment was carried out by the European Muon Collaboration (EMC). Physicists expected that the quarks carry all the proton spin. However, not only was the total proton spin carried by quarks far smaller than 100%, these results were consistent with almost zero (4–24%) proton spin being carried by quarks. This surprising and puzzling result was termed the "proton spin crisis". The problem is considered one of the important unsolved problems in physics. (Wikipedia).

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Related pages

Down quark | Proton | Monte Carlo method | Quark | Muon | Angular momentum | Spin (physics) | Renormalization | Angular momentum operator | Atomic orbital | Up quark