Critical charge in a superstrong magnetic field
a 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 (State University), Institutskii per. 9, Dolgoprudnyi, Moscow Region, 141700, 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.