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)2–3He is evaluated to be about 0.000 002–0.0008 °K while (3He)2–4He is found to be unbound as is (3He)3.
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Duffy et al. (1979) studied this question.
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