Inclusive studies of two- and three-nucleon short-range correlations in ${}^3$H and ${}^3$He

Abstract

Inclusive electron scattering at carefully chosen kinematics can isolate scattering from the high-momentum nucleons in short-range correlations (SRCs). SRCs are produced by the hard, short-distance interactions of nucleons in the nucleus, and because the two-nucleon (2N) SRCs arise from the same N-N interaction in all nuclei, the cross section in the SRC-dominated regime is identical up to an overall scaling factor. This scaling behavior has been used to identify SRC dominance and to measure the contribution of SRCs in a wide range of nuclei. We examine this scaling behavior over a range of momentum transfers using new data on ${}^2$H, ${}^3$H, and ${}^3$He, and find an expanded scaling region compared to heavy nuclei. Motivated by this improved scaling, we examine the ${}^3$H and ${}^3$He data in kinematics where three-nucleon SRCs may play an important role. The data for the largest struck nucleon momenta are consistent with isolation of scattering from three-nucleon SRCs, and suggest that the very highest momentum nucleons in ${}^3$He have a nearly isospin-independent momentum configuration.

Cross section ratios available in the journal supplemental materials