  Spectroscopy of a $^{10}_{\Lambda}$Be hypernucleus was carried out at JLab
Hall C using the $(e,e^{\prime}K^{+})$ reaction. A new magnetic spectrometer
system (SPL+HES+HKS), specifically designed for high resolution hypernuclear
spectroscopy, was used to obtain an energy spectrum with a resolution of 0.78
MeV (FWHM). The well-calibrated spectrometer system of the present experiment
using the $p(e,e^{\prime}K^{+})\Lambda,\Sigma^{0}$ reactions allowed us to
determine the energy levels, and the binding energy of the ground state peak
(mixture of 1$^{-}$ and 2$^{-}$ states) was obtained to be
B$_{\Lambda}$=8.55$\pm$0.07(stat.)$\pm$0.11(sys.) MeV. The result indicates
that the ground state energy is shallower than that of an emulsion study by
about 0.5 MeV which provides valuable experimental information on charge
symmetry breaking effect in the $\Lambda N$ interaction.
