Light Ξ hypernuclei in four-body cluster models

Detailed structure calculations in ¹²_ξ-Be, ⁷_Ξ-H and ¹⁰_Ξ- Li are performed within the framework of the microscopic _Ξ of four-body cluster models. We adopted effective ΞN interactions derived from the Nijmegen interaction models, which give rise to substantially attractive Ξ-nucleus potentials in accordance with the experimental indications. ⁷ _Ξ-H and ¹⁰_Ξ-Li are predicted to have bound states. We propose to observe the Ξ bound states in future (K ^-,K⁺) experiments using ⁷Li and ¹⁰B targets in addition to the standard ¹²C target. The experimental confirmation of these states will provide information on the spin- and isospin-averaged ΞN interaction.