Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment
D. E. Lanskoy, Y. Yamamoto
Abstract
Properties of hypernuclei ΛΛ5H and ΛΛ5He are studied in a two-channel approach with explicit treatment of coupling of channels 3Z+Λ+Λand α+Ξ. Diagonal ΛΛand coupling ΛΛ-ΞN interactions are derived within G-matrix procedure from Nijmegen meson-exchange models. Bond energy ΔBΛΛ in ΛΛ5He exceeds significantly that in ΛΛ5H due to the channel coupling. Diagonal Ξαattraction amplifies the effect, which is sensitive also to Λ-core interaction. The difference of the ΔBΛΛ values can be an unambiguous signature of the ΛΛ-ΞN coupling in ΛΛhypernuclei. However, improved knowledge of the hyperon-nucleus potentials is needed for quantitative extraction of the coupling strength from future data on the ΛΛhypernuclear binding energies.
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