Neutron-rich Hypernuclei

Production and spectroscopy of neutron-rich Λ hypernuclei by double-charge exchange reactions (π−, K+) on nuclear targets are investigated in a theoretical viewpoint. The Λ–Σ coupling in nuclei induces a Σ admixture, which is enhanced in a neutron-excess environment, and plays an important role in production by a one-step mechanism π−p→K+Σ− via Σ− doorways in these reactions. A feasibility of extracting the Σ− admixture probability in the neutron-rich 10ΛLi hypernucleus by the 10B(π−, K+) reaction is examined within a distorted-wave impulse approximation.