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High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the C-12(e, e' p) and C-12(e, e' pN) reactions (where N is either n or p), at high-Q(2) and x(B) > 1.1. The data span a missing-momentum range of 300-1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon (NN) interaction models. This agreement suggests that the measured high missing-momentum protons up to 1000 MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured C-12(e, e' pN)/C-12(e, e' p) and C-12(e, e' pp)/C-12(e, e' pn) cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor NN interaction at similar to 400 MeV/c to an isospin-independent scalar interaction at high-momentum around similar to 800 MeV/c as predicted by theoretical calculation.

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APA Citation

Korover, I., Pybus, J. R., Schmidt, A., Hauenstein, F., Duer, M., Hen, O., Piasetzky, E., Weinstein, L. B., Higinbotham, D. W., Adhikari, S., Adhikari, K., Amaryan, M. J., Angelini, G., Atac, H., Barion, L., Battaglieri, M., Beck, A., Bedlinskiy, I., Benmokhtar, F., … Zheng, X. (2021). 12C(E,e’pn) measurements of short range correlations in the tensor-to-scalar interaction transition region. Physics Letters B, 820, 136523.