Skip to main content
Seminar | Physics Division

Measuring the Coulomb Sum in Nuclei at Jefferson Lab

PHY Seminar

Abstract: Since the discovery of the European Muon Collaboration (EMC) effect, where it was observed that the quark longitudinal momentum distributions in a nucleus are different from those of free nucleons, there has been a long-standing question in nuclear physics as to how the structure of a free nucleon might change when bound in a nucleus or embedded in a nuclear medium. One of the cleanest signatures of in-medium modification can be achieved by testing the Coulomb Sum Rule through quasi-elastic electron scattering; where one counts the expected total nuclear charge by integrating the longitudinal response function of the nucleus and comparing it to the incoherent sum of electric form factors of the constituent nucleons.

Standard nuclear effects that quench the charge response of the nucleus are well understood, leaving any additional quenching to be interpreted as a signature of modification of these form factors in-medium. Experiment E05-110 at Jefferson Lab collected inclusive electron scattering data on nuclear targets over a |q| range of 500 to 1000 MeV/c. Results from recent analyses of Carbon and Iron data will be presented and discussed.