Abstract
High precision γ-ray spectroscopy of Λ hypernuclei with a germanium detector array, Hyperball, has revealed fine structure of various p-shell Λ hypernuclei. From accumulated data the strengths of all the spin-dependent components in the ΛN interaction have been extracted, which play essential roles to improve baryon-baryon interaction models. The hypernuclear shrinking effect was confirmed from measurement of a B(E2) value in ΛLi. In the J-PARC facility, intense kaon beams and a new generation Ge detector array will allow us to investigate baryon properties in nuclei and impurity effects, as well as to further study the hyperon-nucleon interactions.
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