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Gamow-Teller transitions and the spin EMC effect: the Bjorken sum-rule in medium

Gamow-Teller transitions in nuclei tell us that the nucleon's axial charge $g_A^{(3)}$ is quenched in large nuclei by about 20%. This result tells us that the spin structure of the nucleon is modified in nuclei and disfavours models of the medium dependence of parton structure based only on nucleon short range correlations in nuclei. For polarized photoproduction the Gerasimov-Drell-Hearn integral is expected to be strongly enhanced in medium.

preprint2020arXivOpen access
Steven D. Bass
hep-phnucl-th
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Steven D. Bass

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