Some problems of the physics of exotic atoms

Physics news on the Internet: June 2023

“…A test of strong-field quantum electrodynamic theory is of interest for the search for new effects and, perhaps, manifestations of new physics beyond the Standard Model. An alternative to multicharged ions is the study of muon atoms, in which one of the electrons is replaced by a muon (for exotic atoms, see [4]). Because of its large mass, the muon orbital is 207 times closer to the nucleus, where the field is 40,000 times stronger.…”

Relativistic Theory of Spectra of Pionic Atoms With Account of Strong Pion-Nuclear Interaction Effects

“…Practically in all papers the central potential V 0 is the sum of the following potentials. The nuclear potential for the spherically symmetric density ( ) R r ρ is [6,13]:…”

“…At present time one of the most sensitive tests for the chiral symmetry breaking scenario in the modern hadron's physics is provided by studying the exotic hadron-atomic systems. Nowadays the transition energies in pionic atoms are measured with an unprecedented precision and from studying spectra of the hadronic atoms it is possible to investigate the strong interaction at low energies measuring the energy and natural width of the ground level with a precision of few meV [1][2][3][4][5][6][7][8][9][10][11][12][13]. The strong interaction is the reason for a shift in the energies of the low-lying levels from the purely electromagnetic values and the finite lifetime of the state corresponds to an increase in the observed level width.…”

Relativistic Theory of Spectra of Pionic Atoms: Radiation Transition Probabilities

“…In order to take into account very important radiation QED ceffects we use the radiative potential from the Flambaum-based on the using the Klein-Gordon-Fock equation, but there are many important problems connected with accurate accounting for as pion-nuclear strong interaction effects as QED radiative corrections (firstly, the vacuum polarization effect etc.). This topic has been a subject of intensive theoretical and experimental interest (see [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]). The perturbation theory expansion on the physical; parameter Z is usually used to take into account the radiative QED corrections, first of all, effect of the polarization of electron-positron vacuum etc.…”

“…Here problem to be solved is estimate of the hyperfine structure components transitions probabilities. As it was indicated earlier [1][2][3] nowadays investigation of the pionic and at whole the exotic hadronic atomic systems represents a great interest as from the viewpoint of the further development of atomic and nuclear spectral theories as creating new tools for sensing the nuclear structure and fundamental pion-nucleus strong interactions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. It is, above all, the strong pion-nucleon interaction, new information about the properties of nuclei and hadrons themselves and their interactions with the nucleus of the measured energy Xrays emitted during the transition pion spectrum of the atom.…”