Polarization Transfer in 4He($$\vec{e},e'\vec{p}$$)3H
- University of South Carolina
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, e0~p )3H reaction at a Q2 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, in which the measured ratio of polarization-transfer coefficients differs from a fully relativistic DWIA calculation. The earlier polarization-transfer data are equally well described by the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model and by a recent calculation including, particularly, a spin-dependent charge exchange in the final-state interaction. However, the preliminary analysis of our present data possibly implies an unexpected Q2 dependence of the ratio of polarization-transfer coefficients. Due to its high statistical precision the new data allow for a detailed study of the missing momentum dependence of individual polarization-transfer coefficients in the 4He(~e, e0~p )3H reaction. Final results will be discussed.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1964109
- Report Number(s):
- JLAB-PHY-07-962; DOE/OR/23177-5915
- Country of Publication:
- United States
- Language:
- English
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