GSI-FAIR Colloquium

New results from measurements of short-range correlations in nuclei - from the Nuclotron to FAIRONLINE ONLY

by Or Hen (MIT)




New results from a measurement of proton knockout reactions, performed at the JINR in Dubna with a 48 GeV/c Carbon-12 beam, demonstrate the feasibility of accessing properties of short-range correlated nucleons in nuclei with hadronic probes and by using inverse kinematics. We extract the ground-state distributions of single nucleons and correlated nucleon pairs (SRC) in quasi-free kinematics in an exclusive measurement by detecting the two scattered protons at large angles in coincidence with an intact heavy fragment. The post-selection of heavy fragments is shown to suppress the otherwise large contributions from final-state interactions. This allowed for the first time to select and study properties of correlated nucleon pairs in inverse kinematics, which showcases a new ability to study the short-distance structure of short-lived, neutron-rich nuclei at the forthcoming FAIR  facility.
Information on the formation and the properties of these pairs in a  neutron-rich nuclear environment, as extracted from such measurements, will provide a solid basis for the understanding of the properties of the dense cold neutron-rich matter in neutron stars.