arXiv subjects

S. Ohnishi

Publications and source records attributed to S. Ohnishi.

2 recordsLinked to original sources

arXiv2014

Three-body structure of the $nnΛ$ system with $ΛN-ΣN$ coupling

The structure of the three-body $nnΛ$ system, which has been observed recently by the HypHI collaboration, is investigated taking $ΛN-ΣN$ coupling explicitly into account. The $YN$ and $NN$ interactions employed in this work reproduce the binding energies of $^3_Λ$H, $^4_Λ$H and $^4_Λ$He. We do not find any $^3_Λn$ bound state, which contradicts the interpretation of the data reported by the HypHI collaboration.

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arXiv2013

Four-body structure of neutron-rich hypernucleus $^6_Λ$H

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

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