Abstract
The binding energy of the Λ-particle in the J = 1 2 and 3 2 states of Λ 3H and the doublet and quartet Λ-d scattering lengths are calculated with a separable ΛN-ΣN potential matrix, fitted to experimental data in ΛN and ΣN channels. The dependence of the results on ΛΣ coupling is explained in terms of a perturbative treatment of ΛΣ coupling. This perturbative treatment is also applied in a qualitative discussion of the effects of ΛΣ conversion in the J = 0 and 1 states of Λ 4H- Λ 4He and in the J = 1 2 state of Λ 5He. The importance of three-body ΛNN forces caused by ΣΛ coupling is stressed.
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