ΛΛ−ζN coupling effects in light double-Λ hypernuclei Original Research Article

The suppression and enhancement effects of ΛΛ-ζN coupling are investigated in s-shell double-Λ hypernuclei. The Pauli suppression due to this coupling in ΛΛ6He is found to be be 0.43 MeV for the coupling strength of the NSC97e potential. This indicates that the free-space ΛΛ interaction is stronger by about 5° phase shift than that deduced from the empirical data of ΛΛ6He without including the Pauli suppression effect. In ΛΛ5He and ΛΛ5H, an attractive term arising from ΛΛ-ζN conversion is enhanced by the formation of an alpha particle in intermediate ζ states. According to this enhancement, ΔBΛΛ of ΛΛ5He is about 0.27 MeV larger than that of ΛΛ6He.