Light Λ hypernuclear structure has been investigated through the (π+, K+) reaction with use of the SKS spectrometer. Preliminary excitation energy spectra of 7ΛLi, 9ΛBe, 13ΛC and 16ΛO have been measured in the KEK-PS E336 experiment. The spectra of 12ΛC and 16ΛO were discussed in view of the ΛN interaction. It was shown that the high-quality Λ hypernuclear spectra provide us with a valuable mean for the investigation of the ΛN interaction.
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