Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-07-14
AIP Conf.Proc.1056:141-147,2008
Physics
Nuclear Physics
Nuclear Experiment
7 pages, 3 figures. Based on invited talk presented by S. Strauch at "Sixth International Conference on Perspectives in Hadron
Scientific paper
10.1063/1.3013033
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
Malace S.
Paolone Mario
Strauch Steffen
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