Optics Analysis of the Hall A High Resolution Spectrometers. ANDREW WHITBECK (University of Rochester Rochester, NY 14445) DOUG HIGINBOTHAM (Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606)

Experiment E94-107 at Thomas Jefferson National Accelerator Facility (JLab) will measure hypernuclear spectra. Because certain hypernuclear states are extremely close in energy, the Hall A High Resolution Spectrometers (HRS) will need to be calibrated to a higher precision than previously reached. Analysis of elastic optics data taken on a tantalum target at various momenta around a central momentum of 1.85 GeV/c was done in an effort to achieve a momentum, dp/p, full width half max (FWHM) resolution of 1 ×10- 4, the projected design limit of the HRS. Cuts were first applied to the optics data files in order to isolate useful events. The data files were then run through an optimization program to recalculate the optics matrix elements. Other systematic checks were done on various parts of the spectrometers. A FWHM resolution of 1×10- 4 has been attained as a result of this optimization. With this improved HRS resolution, the current hypernulear experiment should be successful in it's measurements.