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Nucleon spin structure


Spin Group 9/2 - Deep Inelastic Scattering: Investigation of Structure within a Nucleon - CERN 2015


2 3 Models of nuclear structure 2 3a QCD and nuclear force optional University of Geneva Cours


Particle Physics – General presentation of the course


Murray Gell-Mann - Bjorken's idea (130/200)


NICA: Recreating the first moments of the Universe in the Lab

Nucleon spin structure describes the partonic structure of nucleon intrinsic angular momentum (spin). The key question is how the nucleon's spin, whose magnitude is 1/2ħ, is carried by its constituent partons. It was originally expected before the 1980s that quarks carry all of the nucleon spin, but later experiments contradict this expectation. In the late 1980s, the European Muon Collaboration (EMC) conducted experiments that suggested the spin carried by quarks is not sufficient to account for the total spin of the nucleons. This finding astonished particle physicists at that time, and the problem of where the missing spin lies is sometimes referred to as the proton spin crisis.
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