Abstract:The present status and future prospects of precision γ-ray spectroscopy of Λ hypernuclei are described. A new experiment (J-PARC E13) has been performed at the J-PARC K1.8 line employing a newly-developed germanium (Ge) detector array, Hyperball-J, via the (K − , π − ) reaction on 4 He and 19 F targets. This is the first study of s-shell and sd-shell Λ hypernuclei with Ge detectors. The 4 He target spectrum exhibited a γ-ray peak of 4 Λ He(1 + → 0 + ) at 1.406 ± 0.002 ± 0.002 MeV. Compared with the energy (1.0… Show more
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