Medium Modifications from 4He((e)over-right-arrow, e′ (p)over-right-arrow)3H

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 fonts factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the He-4((e) over right arrow ,e'(p) over right arrow)H-3 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) front both Mainz and Jefferson Lab. The measured ratio of polarization-transfer coefficients differs front 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.