Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprx10005x&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Electromagnetic form factors are fundamental quantities in understanding the underlying structure of nucleons. While proton electromagnetic form factors have been determined with good precision, neutron form factors are known poorly, largely due to the lack of free neutron targets. Jefferson Lab Hall A experiment E95-001, a precise measurement of the transverse asymmetry A_T' from quasi-elastic ^3He(e,e') process, was therefore designed to precisely determine the neutron magnetic form factor, G_M^n and was successfully completed in Spring 1999. High precision A_T' data in the quasi-elastic region at Q^2 values of 0.1 to 0.6 (GeV/c)^2 were obtained. The extraction of form factors is usually model-dependent. Significant constraints on theoretical calculations are provided by additional high precision quasi-elastic asymmetry data at Q^2 values of 0.1 and 0.2 (GeV/c)^2 in the elastic threshold region, where effects of final state interactions(FSI) and meson exchange currents (MEC) are expected to be large. G_M^n is extracted from a Faddeev calculation which includes both FSI and MEC at Q^2 values of 0.1 and 0.2 (GeV/c)^2. The uncertainties of G_M^n at these Q^2 values are comparable to those of recent experiments with deuterium targets. The results of asymmetries and G_M^n extracted from the Faddeev calculations will be presented. The reliable extraction of G_M^n from A_T' at higher Q^2 values requires improved theoretical calculations including relativistic effects, which is currently underway.
E95-001 Collaboration
Xu Wei-Wei
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