Nuclear Physics Seminars

ics Nuclear
Tuesday, October 10, 2006
3:30 PM
Physics Building, Room 204
Brandon Craver [Host: Donal Day]
"A High Precision Measurement of G E n High Q 2 "
A precision measurement of the electric form factor of the neutron, G E n , has been carried out in Jefferson Lab's Hall A for Q 2 values of 1.2 to 3.5 (GeV/c) 2 using a highly polarized 3 He target and the quasi-elastic semi-exclusive 3 He(e,e'n) reaction. The experiment detected the ejected neutron with an array of scintillators and the scattered electron with the newly commissioned BigBite spectrometer. This new spectrometer has a large angular acceptance (80 msr), complementing the existing 6 msr high-resolution spectrometers, and enables a new generation of low-rate experiments with lower resolution requirements. A package of three multi-wire drift chambers was constructed in order to allow the spectrometer to operate under high rate conditions and achieve a spatial resolution of ~ 200 μm. The present status of the experiment will be presented as well as online results showing chamber performance at raw hit rates up to 20 MHz per plane.

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