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We study the very recently discovered $\Theta^+$ (1540) at SPring-8, at ITEPand at CLAS-Thomas Jefferson Lab. We apply the same RGM techniques that alreadyexplained with success the repulsive hard core of nucleon-nucleon, kaon-nucleonexotic scattering, and the attractive hard core present in pion-nucleon andpion-pion non-exotic scattering. We find that the K-N repulsion excludes theTheta+ as a K-N s-wave pentaquark. We explore the Theta+ as heptaquark,equivalent to a N+pi+K borromean boundstate, with positive parity and totalisospin I=0. We find that the kaon-nucleon repulsion is cancelled by theattraction existing both in the pion-nucleon and pion-kaon channels. Althoughwe are not yet able to bind the total three body system, we find that theTheta+ may still be a heptaquark state.Comment: 5 pages, 3 figures, 1 table, contribution to the X International  Conference on Hadron Spectroscopy, HADRON 2003, August 31 - September 6,  2003, Aschaffenburg, German

The Θ+ (1540) as a heptaquark with the overlap of a pion, a kaon and a nucleon