The ${}_{\Lambda\Lambda}^{\,\,\,\,4}n$ system

Abstract

Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifs of the $nn$ system and the latest updates of the $n\Lambda$ and $\Lambda\Lambda$ Nijmegen ESC08c potentials we study the possible existence of a ${}_{\Lambda\Lambda}^{\,\,\,\,4}n$ bound state. Our results indicate that the ${}_{\Lambda\Lambda}^{\,\,\,\,4}n$ is unbound, being just above threshold. We discuss the role played by the $^1S_0$ $nn$ repulsive term of the Yukawa-type Malfliet-Tjon interaction.