Mixed and fermionic helium trimers

Abstract
The existence of mixed and fermionic helium trimers is investigated via the Faddeev–UPE method. Each three‐atom system is assumed to interact through phenomenological pairwise local potentials. The ground‐state binding energy of (4He)23He is evaluated to be about 0.000 002–0.0008 °K while (3He)24He is found to be unbound as is (3He)3.