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Multi-Λ Hypernuclei in an Effective Hadronic Model

We extend the chiral hadronic model (FST) with an inclusion of Λ hyperon to investigate the properties of multi-Λ hypernuclei. With such an effective hadronic model in the relativistic mean-field approximation, we accomplish the calculations with both the conventional strong Λ–Λ interaction and the weak Λ–Λ interaction determined from recent experiment. Our calculations indicate that not only the strong but also the weak Λ–Λ interaction provide tighter binding for multi-Λ hypernuclei than the ones with only nucleons. However the strong interaction generates a binding slightly tighter than the weak interaction.