Borromean Binding of Three or Four Bosons

Details Borromean Binding of Three or Four Bosons Borromean Binding of Three or Four Bosons

2000-03-12

arxiv.org/abs/nucl-th/0003026v1

Phys.Rev. A62 (2000) 032504

Physics

Nuclear Physics

Nuclear Theory

12 pages, RevTeX, 5 Figures in tex included

Scientific paper

10.1103/PhysRevA.62.032504

We estimate the ratio $R=g_{3}/g_{2}$ of the critical coupling constants $g_{2}$ and $g_{3}$ which are required to achieve binding of 2 or 3 bosons, respectively, with a short-range interaction, and examine how this ratio depends on the shape of the potential. Simple monotonous potentials give $R\simeq 0.8$. A wide repulsive core pushes this ratio close to R=1. On the other hand, for an attractive well protected by an external repulsive barrier, the ratio approaches the rigorous lower bound $R=2/3$. We also present results for N=4 bosons, sketch the extension to $N>4$, and discuss various consequences.

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