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Some problems of the physics of exotic atomsa National Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation b M.V. Lomonosov Pomor State University, prosp. Lomonosova, 4, Arkhangelsk, 163006, Russian Federation The current status of the physics of exotic atoms is reviewed. The problem of the anomalous width of the kaonic helium 2p level is analyzed, experimental CPT invariance tests for the antihydrogen are discussed, and results of investigations on the metastability of the antiproton (as well as of π-, μ-, K-, Σ-, ...) in helium are considered. A comparison is made of the well-known Condo model and the ionic model. In the latter, the ion ( -{p} αee) — a so-called ’ioncule’ — forms after -{p} is stopped in its motion in helium. One of the ioncule’s electrons is weakly bound, resides at one of the Efimov levels, and orbits at ~ 20 a.u. in the dipole field of the neutral ’atomcule’ ( -{p} αe). The lifetime of the ioncule is long (> 10-5 s) and the antiproton’s vibrational-rotational transition frequencies ω are practically equal to the atomcule value (Δω /ω ~ 10-5-10-6 ) — in agreement with laser-spectroscopy data. While the ionic model results on the quenching cross sections of metastable states by impurity atoms and molecules in helium agree well with experiment, the atomcule-based Condo model underrates the cross sections by
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