Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-09-25
AIP Conf.Proc.967:135-140,2007
Physics
Nuclear Physics
Nuclear Experiment
Proceedings prepared for the Fifth International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt07), Ma
Scientific paper
10.1063/1.2834464
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.
for the Jefferson Lab Hall A Collaboration
Strauch Steffen
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