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We have studied the structure of K- pp comprehensively by solving thisthree-body system in a variational method, starting from the Ansatz that theLambda(1405) resonance (~ Lambda*) is a K-p bound state. The structure of K-ppreveals a molecular feature, namely, the K- in Lambda* as an "atomic center"plays a key role in producing strong covalent bonding with the other proton. Wepoint out that strongly bound Kbar nuclear systems are formed by ``superstrong" nuclear force due to migrating real bosonic particles Kbar a laHeitler-London-Heisenberg, whereas the normal nuclear force is caused bymediating virtual pions. We have shown that the elementary process, p + p -->K+ + Lambda* + p, which occurs in a short impact parameter and with a largemomentum transfer, leads to unusually large self-trapping of Lambda* by theinvolved proton, since the Lambda*-p system exists as a compact doorway statepropagating to K-pp.

Super strong nuclear force caused by migrating Kbar mesons - Revival of the Heitler-London-Heisenberg scheme in kaonic nuclear clusters