HYPERNUCLEAR CONSTRAINTS ON ΛN AND ΛN N INTERACTIONS

Recent work on using density-dependent Λ-nuclear optical potentials in calculations of Λ-hypernuclear binding energies is reviewed. It is found that all known Λ binding energies in the mass range of 16 ≤ A ≤ 208 are well fitted in terms of two interaction parameters: one, attractive, for the spin-averaged ΛN interaction, and another one, repulsive, for the ΛN N interaction. The ΛN interaction term by itself overbinds Λ hypernuclei, in quantitative agreement with recent findings obtained in EFT and Femtoscopy studies. The strength of the ΛN N interaction term is compatible with values required to resolve the hyperon puzzle.