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The ^4He_3 bound states and the scattering of a ^4He atom off a ^4He dimer atultra-low energies are investigated using a hard-core version of the Faddeevdifferential equations. Various realistic ^4He-^4He interactions were employed,amomg them the LM2M2 potential by Aziz and Slaman and the recent TTY potentialby Tang, Toennies and Yiu. The ground state and the excited (Efimov) stateobtained are compared with other results. The scattering lengths and theatom-diatom phase shifts were calculated for center of mass energies up to 2.45mK. It was found that the LM2M2 and TTY potentials, although of quite differentstructure, give practically the same bound-state and scattering results.Comment: RevTeX, 14 pages, 1 eps-figure; list of references has been extended  and some minor changes of the text have been don

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Binding energies and scattering observables in the 4He3 atomic system