We have been performing Λ hypernuclear spectroscopic experiments by the (e,e′K+) reaction since 2000 at Thomas Jefferson National Accelerator Facility (JLab). The (e,e′K+) experiment can achieve a few 100 keV (FWHM) energy resolution compared to a few MeV (FWHM) by the (K-, π-) and (π+, K+) experiments. Therefore, more precise Λ hypernuclear structures can be investigated by the (e,e′K+) experiment. Λ7He,Λ9Li, Λ10Be, Λ12B,Λ28 Al,Λ52 V were measured in the experiment at JLab Hall-C. In addition, Λ9 Le Λ12 B Λ16 N and were measured in the experiment at JLab Hall-A.
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