Hypernuclear γ-ray spectroscopy: present status and perspectives 1

Hypernuclear γ-ray spectroscopy experiments using a germanium detector array, Hyperball, have accumulated precise data on various p-shell Λ hypernuclei. A common parameter set of the spin-dependent effective interaction strengths (Δ, SΛ, SN, and T), which reproduces most of the hypernuclear data, has been determined. In the J-PARC facility, further experiments of hypernuclear γ-ray spectroscopy are planned to be performed.