\begin{document}$ \Lambda\Lambda nn-\Xi^- pnn $\end{document} system was studied to investigate whether the inclusion of channel coupling is able to bind the \begin{document}$ \Lambda\Lambda nn $\end{document} system. We use a separable potential three-body model of the coupled \begin{document}$ \Lambda\Lambda nn - \Xi^- pnn $\end{document} system and a variational four-body calculation with realistic interactions. Our results exclude the possibility of a \begin{document}$ \Lambda\Lambda nn $\end{document} bound state by a large margin. Instead, we found a \begin{document}$ \Xi^- t $\end{document} quasibound state above the \begin{document}$ \Lambda\Lambda nn $\end{document} threshold."> <inline-formula><tex-math id="M1">\begin{document}${ \Xi^- t} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7695dc19-b873-45cc-9e4c-07b4ac338129/CPC-2019-0352_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/7695dc19-b873-45cc-9e4c-07b4ac338129/CPC-2019-0352_M1.png"/></alternatives></inline-formula> quasibound state instead of ΛΛ<i>nn</i> bound state -
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