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The missing-mass spectroscopy of $\Lambda$ hypernuclei via the$(e,e^{\prime}K^{+})$ reaction has been developed through experiments at JLabHalls A and C in the last two decades. For the latest experiment, E05-115 inHall C, we developed a new spectrometer system consisting of the HKS and HES;resulting in the best energy resolution ($E_{\Lambda} \simeq0.5$-MeV FWHM) and$B_{\Lambda}$ accuracy ($B_{\Lambda}\leq0.2$ MeV) in $\Lambda$-hypernuclearreaction spectroscopy. This paper describes the characteristics of the$(e,e^{\prime}K^{+})$ reaction compared to other reactions and experimentalmethods. In addition, the experimental apparatus, some of the importantanalyses such as the semi-automated calibration of absolute energy scale, andthe performance achieved in E05-115 are presented.

Experimental techniques and performance of $\Lambda$-hypernuclear spectroscopy with the $(e,e^{\prime}K^{+})$ reaction