[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Wednesday, Sept. 23, 2009
11:00AM
CEBAF Center AUD.
**
"Cross Section of Exclusive pi- Electro-production from the Neutron"

Jixie Zhang
Old Dominion University*

Although the excited states of the proton have been studied in great 
detail, there are very few data available for the neutron resonances 
because of the difficulty inherent in obtaining a free neutron target. 
To overcome this limitation, the spectator tagging technique was used in 
one of the CEBAF Large Acceptance Spectrometer(CLAS) collaboration 
experiments, E03-012,Barely off-shell Nuclear Structure (BoNuS), in 
Hall-B at Jefferson Lab. In this experiment, A newly built low 
threshold, as low as proton momentum 67 MeV/c, radial time projection 
chamber (RTPC) based on the gaseous electron multiplier (GEM) technology 
was used to detect recoil protons. Electron scattering data were taken 
in 2005 with beam energies of 2.1, 4.2 and 5.3 GeV using a 7 atm gaseous 
deuterium target in conjunction with the RTPC and CLAS detectors. The 
exclusive D(e,e'pi-p)p events, in which the proton was detected either 
in CLAS or in the RTPC, have been analyzed. Preliminary cross sections 
will be presented.










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