Four-body structure of neutron-rich hypernucleus 6ΛH

The structure of heavy hyperhydrogen 6ΛH is studied within the framework of a tnnΛtnnΛ four-body cluster model. Interactions among the constituent subunits are determined so as to reproduce reasonably well the observed low energy properties of the tn,tΛtn,tΛ and tnn subsystems. As long as we reproduce the energy and width of 5H within the error bar, the ground state of 6ΛH is obtained as a resonant state.