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Effects of ΣN channels on the Spin-Orbit Force in Λ-hypernuclei

Effects of the ΣN channels on the spin-orbit force in Λ-hypernuclei are investigated. It is found that the cancellation between the symmetric and the antisymmetric ΛN spin-orbit force becomes more complete when the contribution from the ΣN channels is included. This may be the one of the reasons why the observed LS splitting of the Λ single particle energy is very small. PACS: 12.39.Jh, 13.75.Ev, 21.30.Fe