$\Lambda$ Hypernuclear Spectroscopy up to the Medium-Heavy Region Through the (e,e$'$K$^{+})$ Reaction

The ``Spectroscopic Study of $\Lambda$ Hypernuclei up to the Medium-Heavy Mass Region Through the (e,e$'$K$^{+})$ Reaction'' (HKS Experiment) was successfully completed during the summer of 2005 at Jefferson Laboratory. It utilized a new High Resolution Kaon Spectrometer (HKS) and a ``Tilt Method'' on the electron arm. These features aim to achieve the best ever hypernuclear energy resolution and the highest possible production yield of $\Lambda$ Hypernuclei. The goal of the experiment is to investigate $\Lambda$ hypernuclear structures with precise measurements of the mass spectra from light to medium-heavy mass region. Such precise spectroscopy will provide valuable information on the single-particle behavior of $\Lambda$ hyperon in a nuclear medium and gain knowledge on the effective $\Lambda$-N interaction and nuclear structure probed by the $\Lambda$ hyperon. An overview of HKS experiment will be presented and preliminary results of the excitation spectra from various targets will be showcased.