The hypernuclei Λ4He and Λ4H with modern YN interactions Original Research Article

The hypernuclei Λ4He and Λ4H provide important information on the hyperon-nucleon interaction. Using the Nijmegen SC YN interactions the 0+ ground and the 1+ excited states are precisely calculated using the Faddeev-Yakubovsky equation. The Λ-Σ admixture is taken into account explicitly. For all these interactions the Λ separation energies disagree with the data.