We confirm the existence of and study the location and spatial shape for the ground bound state of the triatomic system that contains one lithium (6Li or 7Li) atom and two boson helium partners. The computational method employed involves a variationally determined multi-center expansion over Gaussian functions of variable width, as discussed in our previous recent work. The overall behavior of this very diffuse, bound wave-function with zero angular momentum is analyzed in detail to extract specific indicators on its spatial features. The strength of the available three-particle interaction is arbitrarily scaled in order to investigate the possible appearance of either halo or Efimov states in the present system.

This work was partially supported by the SpanishÈItalian Joint Project HI1999-0157, by the DGICYT (Spain) under contract PB95-0071, and by the Italian National Research Council (CNR). The stay in Madrid of I.B. during the devel- opment and completion of the present work was supported by the EC Research Network with the Contract No. FMRX- CT96-0088.

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