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Critical charge in a superstrong magnetic fielda Russian Federation State Scientific Center ‘A.I. Alikhanov Institute of Theoretical and Experimental Physics’, ul. Bolshaya Cheremushkinskaya 25, Moscow, 117259, Russian Federation b Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation c National Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation d Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russian Federation The phenomenon of a critical charge in a superstrong magnetic field is discussed taking into account the screening of the Coulomb potential and the finite size of a nucleus.
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