Recent measurements of observables related to proton and neutron spin properties at low energies are in disagreement with the available theoretical predictions, and continue to challenge nuclear experimentalists and theorists alike.
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Ahmed, M.W. Nucleon spins surprise. Nat. Phys. 17, 670–671 (2021). https://doi.org/10.1038/s41567-021-01263-7
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DOI: https://doi.org/10.1038/s41567-021-01263-7