Preliminary results from Jefferson Lab HKS experiment

Jefferson Lab hypernuclear program aims to obtain high resolution hypernuclear spectroscopy in a wide mass region by utilizing high precision electron beam. The second experiment in the program, JLab HKS experiment, which was carried out in 2005, employed an on-target Splitter magnet to detect both scattered e' and K$^+$ at very forward angles in order to increase hypernuclear yield. The preliminary results from this experiment has demonstrated the ability of this experimental program to obtain high resolution, high statistics spectroscopy. A specially designed calibration procedure for the spectrometer system has enabled us to further improve the energy resolution of the spectra. In this talk, I will present the current updated spectra of $^{12}_\Lambda$B, $^{28}_\Lambda$Al and $^{7}_\Lambda$He. The experimental setup and spectrometer calibration procedure will also be described.