## Abstract

High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the ^{12}C(e,e^{′}p) and ^{12}C(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 ^{12}C(e,e^{′}pN) / ^{12}C(e,e^{′}p) and ^{12}C(e,e^{′}pp) / ^{12}C(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 ∼400 MeV/c to an isospin-independent scalar interaction at high-momentum around ∼800 MeV/c as predicted by theoretical calculation.

Original language | English |
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Article number | 136523 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 820 |

DOIs | |

State | Published - 10 Sep 2021 |

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