Spectroscopic Investigation of Lambda Hypernuclei in the Wide Mass Region by the Reaction (e,e'K)

The third-generation (\emph{e,e'K$^{+}$}) hypernuclear experiment E05115 at Jlab HallC was carried out in 2009. The goal of the experiment is to obtain high precision spectroscopy for medium-heavy hypernuclei $^{52}_\Lambda$V as well as light p shell hypernuclei $^{12}_\Lambda$B,$^{7}_\Lambda$He,$^{9}_\Lambda$Li and $^{10}_\Lambda$Be. The newly developed HES(High-resolution Electron Spectrometer) was employed in this experiment.Compared to last Jlab HallC hypernuclear experiment which run in 2005, the higher beam energy and brand new electron spectrometer makes the ``tilt method'' work more effectively. In this talk, I will present the experimental setup, the improved spectrometer calibration procedure as well as the preliminary spectrum.