The structure of the ~(10) _ΛBe and ~(10) _ΛB with an α + α + Λ + N four-body model cluster model is studied. The two-body ΛN interaction is adjusted so as to reproduce the ~(0 +-1 +) splitting of ~4 _ΛH. Also a phenomenological ΛN charge symmetry breaking (CSB) interaction is introduced. The ΛN CSB interaction works repulsively by +0.1MeV (attractively by -0.1MeV) in ~(10) _ΛBe (~(10) _ΛB). A neutron-rich Λ hypernucleus, ~6 _ΛH is studied within a framework of t + Λ + n + n four-body model. As long as we reproduce the energy and width of ~5H within the error bar, then ground state of ~6 _ΛH is obtained as a resonant state.
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