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Baryon-antibaryon nucleiThe present state of the problem of quasinuclear systems containing antibaryons (BˉB and 2N2ˉN mesons and 2NˉN baryons) is reviewed. A discussion is presented of the experimental data (the resonances which are strongly coupled with the NˉN channel, with masses of about 2 GeV) and of the central theoretical questions (the energy spectra and properties of the quasinuclear systems, the annihilation widths and shifts of the quasinuclear levels, the pˉp atom, and radiative transitions from atomic states to quasinuclear states).
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