Medium Modifications from 4He(e,e'p)3H

Abstract

Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the 4He(e,e'p)3H reaction at a Q^2 of 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2 with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c)^2 from both Mainz and Jefferson Lab. The measured ratio of polarization-transfer coefficients differs from a fully relativistic calculation, favoring either the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model or strong charge-exchange final-state interactions. The measured induced polarizations agree well with the fully relativistic calculation and indicate that these strong final-state interactions may not be applicable.

7 pages, 3 figures. Based on invited talk presented by S. Strauch at "Sixth International Conference on Perspectives in Hadronic Physics", ICTP, Trieste, May 12-16, 2008

Cited by in corpus (6)

• Quark-Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond
• Neutron Properties in the Medium
• Modification of generalized vector form factors and transverse charge densities of the nucleon in nuclear matter
• Medium modifications of the bound nucleon GPDs and the quark contribution to the spin sum rule
• Transverse charge densities in the nucleon in nuclear matter
• Neutrino propagation in the neutron star with uncertainties from nuclear, hadron, and particle physics