Since 1998 we have conducted the project of precision hypernuclear γ-ray spectroscopy using the Ge detector array, Hyperball, and revealed precise level schemes of various p-shell hypernuclei. In the latest experiment at KEK (E566), the ground-state spacing of Λ11C and Λ12C hypernuclei have been obtained using the 12C (π+, K+) Λ11B, Λ12C reaction. The accumulated data on the p-shell hypernuclear level energies allow us to establish all of the four strengths of the ΛN spin-dependent interactions and to discuss the ΛN-ΣN coupling force in a nucleus. Further experiments at J-PARC are being prepared, where we tackle new experimental challenges such as a precise measurement of the Λ-spin-flip B (M 1) values and exploration of sd-shell hypernuclei.
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