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Calculations demonstrate no A(y) problem in neutron–proton scattering, suggesting alignment with recent measurements.
We calculate Ay in neutron–proton scattering for the interactions models WJC-1 and WJC-2 in the Covariant Spectator Theory. We find that the recent 12 MeV measurements performed at TUNL are in better agreement with our results than with the Nijmegen Phase Shift Analysis of 1993, and after reviewing the low-energy data, conclude that there is no Ay problem in low-energy np scattering.
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Gross et al. (2008) studied this question.
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