27-10-2012, 12:03 PM
Quasifree Electroproduction of Lambda, Sigma0, and Sigma Hyperons on Carbon and Aluminum
ABSTRACT
The first study of (e,e’,K+) on carbon and aluminum was performed at Thomas Jefferson National Accelerator Facility
(Jefferson Lab) using the Continuous Electron Beam Accelerator Facility (CEBAF). The scattered electron and
electroproduced kaon were detected in coincidence in the Hall C End Station using the High Momentum Spectrometer and
Short Orbit Spectrometer. The quasifree production of the Lambda, Sigma0, and Sigma-hyperons was studied. The
Lambda-dependence of the effective nucleon number was obtained. The cross section data were fit to a power law
((approx)Aa) with a= 0.88+/- 0.10, consistent with the K+’s relatively long nuclear mean free path. A large enhancement in
the Sigma0+Sigma- / Lambda ratio is seen. A feasibility test for hypernuclear spectroscopy on C-12 and Al-27 with the
HMS-SOS was performed.
ABSTRACT
The first study of (e,e’,K+) on carbon and aluminum was performed at Thomas Jefferson National Accelerator Facility
(Jefferson Lab) using the Continuous Electron Beam Accelerator Facility (CEBAF). The scattered electron and
electroproduced kaon were detected in coincidence in the Hall C End Station using the High Momentum Spectrometer and
Short Orbit Spectrometer. The quasifree production of the Lambda, Sigma0, and Sigma-hyperons was studied. The
Lambda-dependence of the effective nucleon number was obtained. The cross section data were fit to a power law
((approx)Aa) with a= 0.88+/- 0.10, consistent with the K+’s relatively long nuclear mean free path. A large enhancement in
the Sigma0+Sigma- / Lambda ratio is seen. A feasibility test for hypernuclear spectroscopy on C-12 and Al-27 with the
HMS-SOS was performed.