Structure of Neutron-Rich Λ Hypernuclei

The structure of three neutron-rich (Formula presented.) are studied. For (Formula presented.) system, which has been observed by the HyHI collaboration, we investigate the possibility to have a bound state taking (Formula presented.) coupling explicitly into account. We do not find any(Formula presented.)bound state, which is inconsistent with the data by HyHI collaboration. The four-body calculation of (Formula presented.) for (Formula presented.)6 H is done and obtained as a resonant state with respect to ⁴ _ΛH + n + n threshold. This calculation is also consistent with the FINUDA data which reported to have a bound state for (Formula presented.).