Light ΛΛ hypernuclei and the onset of stability for ΛΞ hypernuclei

New Faddeev-Yakubovsky calculations for light ΛΛ hypernuclei are presented in order to assess the self-consistency of the ΛΛ-hypernuclear binding-energy world data and the implied strength of the ΛΛ interaction, in the wake of recent experimental reports on _ΛΛ⁴H and _ΛΛ⁶He. Using Gaussian soft-core simulations of Nijmegen one-boson-exchange model interactions, the Nijmegen soft-core model NSC97 simulations are found close to reproducing the recently reported binding energy of _ΛΛ⁶He, but not those of other species. For stranger systems, Faddeev calculations of light Λξ hypemuclei, using a simulation of the strongly attractive ΛΞ interactions due to the same model, suggest that _ΛΞ⁶He marks the onset of nuclear stability for Ξ hyperons.