Is there a bound Lambda-n-n ?
  The HypHI Collaboration at GSI argued recently for a (Lambda-n-n) bound state from the observation of its two-body (t + pi-) weak-decay mode. We derive constraints from several hypernuclear systems, in particular from the A=4 hypernuclei with full consideration of (Lambda N <--> Sigma N) coupling, to rule out a bound (Lambda-n-n). 
Avraham Gal and Humberto Garcilazo
nucl-th hep-ph nucl-ex