Properties of hypernuclei 5ΛΛ H and 5ΛΛ He are studied in a two-channel approach with explicit treatment of coupling of channels 3Z +Λ+Λ and α+Ξ . Diagonal ΛΛ and coupling ΛΛ-ΞN interactions are derived within G -matrix procedure from Nijmegen meson-exchange models. Bond energy ∆ BΛΛ in 5ΛΛ He exceeds significantly that in 5ΛΛ H due to the channel coupling. Diagonal Ξα attraction amplifies the effect, which is sensitive also to Λ -core interaction. The difference of the ∆ BΛΛ values can be an unambiguous signature of the ΛΛ-ΞN coupling in ΛΛ hypernuclei. However, improved knowledge of the hyperon-nucleus potentials is needed for quantitative extraction of the coupling strength from future data on the ΛΛ hypernuclear binding energies.
Physical Review C
- Pub Date:
- January 2004
- Forces in hadronic systems and effective interactions;
- Hyperon-nucleon interactions;
- Nuclear Theory
- 11 pages with 3 figures