Abstract
The unitary pole expansion for the local soft-core potentials I and III of Malfliet and Tjon is obtained, and the Faddeev-Lovelace equations are solved for the separable potentials. The energyE T of the triton and the doublet scattering length2 a have been obtained. The results are −8.59 MeV ≦ET≦ −8.57 MeV and 0.89 fm≦2 a≦0.91 fm. For the quartet scattering length a value4 a = 6.39 fm has been found.
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