Nonexistence of a Λnn bound state

It has been recently suggested that there exists a neutral bound state of two neutrons and a Λ hyperon, Λ3n. We point out that by using either simple separable potentials or a full-fledged calculation with realistic baryon-baryon interactions derived from the constituent quark cluster model it can be seen that there is no possibility for the existence of such a Λnn bound state. For this purpose, we performed a full Faddeev calculation of the Λnn system in the (I,JP)=(1,1/2+) channel using the interactions derived from the constituent quark cluster model which describes well the two-body NN and NY data and the Λnp hypertriton.