Abstract
We have studied the structure of K-pp by solving this system in a variational method, starting from the ansatz that Λ* = Λ(1405) is a K-p quasi-bound state. The structure of K-pp reveals a molecular feature, namely, the K- in Λ* as an "atomic center" plays a key role in producing strong covalent bonding with the other proton. Deeply bound [Formula: see text] nuclear systems are formed by this "super-strong" nuclear force due to migrating real bosons [Formula: see text]a la Heitler-London-Heisenberg, which overcompensates the stiff nuclear incompressibility. Theoretical background of our phenomenological [Formula: see text] interaction is discussed, in connection with "decaying-state" description of kaonic nuclear clusters, concerning the effective [Formula: see text] interaction based on chiral SU (3) dynamics. It is of virtual importance to determine whether the Λ* mass is 1405 MeV or 1420 MeV. It is found that a K- absorption at rest in 3 He provides a testing ground better than that in 4 He .
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