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The DIRAC experiment at the CERN PS accelerator observed for the first time the long-lived hydrogenlike π+π− atoms. Atoms were produced by PS proton beam on the Be target. Part of the atoms in the long-lived states crossed the gap of 96 mm and then broken in the Platinum foil of 2.1 µm. producing π+π− pairs(atomic pairs). From the analysis of the
On the same setup there were identified more than 7000 K+K- pairs with effective mass less than 2MK + 5Mev. In the distributions of K+K– pairs there is a strong signature of the Coulomb enhancement: the pairs number is increasing with the decreasing of the relative momentum in the pair c.m.s. The observed number of K+K– pairs with small relative momentum allows us to evaluate for the first time the number of K+K– atoms produced simultaneously with this pairs.