A V Maiorova

The Coulomb glory effect in collisions of antiprotons with heavy nuclei: relativistic theory

Collisions of antiprotons with bare uranium nuclei are studied for scattering angles near 180° in the framework of relativistic theory. The Coulomb glory phenomenon is investigated at antiproton energies in the range 100 eV–2.5 keV. The vacuum polarization effect and the anomalous magnetic moment of the antiproton are taken into account. Estimations of possible influence of such effects as radiative recombination and antiproton annihilation are given.

Parity nonconservation in the radiative recombination of electrons with heavy hydrogen-like ions

The parity nonconservation effect on the radiative recombination of electrons with heavy hydrogen-like ions is studied. Calculations are performed for the recombination into the 21S0 state of helium-like thorium and gadolinium, where, due to the near-degeneracy of the opposite-parity 21S0 and 23P0 states, the effect is strongly enhanced. Two scenarios for possible experiments are studied. In the first scenario, the electron beam is assumed to be fully polarized while the H-like ions are unpolarized, and the polarization of the emitted photons is not detected. In the second scenario, the linearly polarized photons are detected in an experiment with unpolarized electrons and ions. Corresponding calculations for the recombination into the 23P0 state are presented as well.

Quantum Electrodynamics Effects in Heavy Ions and Atoms

Quantum electrodynamics theory of heavy ions and atoms is considered. The current status of calculations of the binding energies, the hyperfine splitting and g factor values in heavy few‐electron ions is reviewed. The theoretical predictions are compared with available experimental data. A special attention is focused on tests of quantum electrodynamics in strong electromagnetic fields and on determination of the fundamental constants. Recent progress in calculations of the parity nonconservation effects with heavy atoms and ions is also reported.

Polarization studies on the two-step radiative recombination of highly charged, heavy ions

Radiative recombination of a free electron into an excited state of a bare, high-Z ion is studied, together with its subsequent decay, within the framework of the density matrix theory and Diracs relativistic equation. Special attention is paid to the polarization and angular correlations between the recombination and the decay photons. In order to perform a systematic analysis of these correlations the general expression for the double-differential recombination cross section is obtained by making use of the resonance approximation. Based on this expression, detailed computations for the linear polarization of x-ray photons emitted in the (e, 2 gamma) two-step recombination of uranium ions U92+ are carried out for a wide range of projectile energies.

Coulomb glory in low-energy antiproton scattering by a heavy nucleus: screening effect of vacuum polarization

A V Maiorova, D A Telnov, V M Shabaev, G Plunien and T Stöhlker 1 Department of Physics, St. Petersburg State University, Ulianovskaya 1, Petrodvorets, St. Petersburg 198504, Russia 2 Institut für Theoretische Physik, TU Dresden, Mommsenstrasse 13, D-01062 Dresden, Germany 3 Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany and 4 Physikalisches Institut, Philosophenweg 12, D-69120 Heidelberg, Germany Abstract Backward scattering of antiprotons by bare uranium is studied theoretically for antiproton energies within the interval 100 eV – 1 keV. A marked maximum of the differential cross section in the backward direction (Coulomb glory) at some energies of the incident particle is revealed. The effect is due to the screening properties of the vacuum polarization potential and can be regarded as a manifestation of the vacuum polarization in non-relativistic collisions of heavy particles. Experimental observation can become feasible with new facilities for antiproton and ion research at GSI.Backward scattering of antiprotons by bare uranium is studied theoretically for antiproton energies within the interval 100 eV–1 keV. An observable maximum of the differential cross section in the backward direction (Coulomb glory) at some energies of the incident particle is revealed. The effect is due to the screening properties of the vacuum polarization potential and can be regarded as a manifestation of the vacuum polarization in non-relativistic collisions of heavy particles. Experimental observation can become feasible with new facilities for antiproton and ion research at GSI.

Backward scattering of low-energy antiprotons by highly charged and neutral uranium: Coulomb glory

Collisions of antiprotons with He-, Ne-, Ni-like, bare, and neutral uranium are studied theoretically for scattering angles close to 180 deg. and antiproton energies in the interval from 100 eV to 10 keV. We investigate the Coulomb glory effect which is caused by a screening of the Coulomb potential of the nucleus and results in a prominent maximum of the differential cross section in the backward direction at some energies of the incident particle. We found that for larger numbers of electrons in the ion the effect becomes more pronounced and shifts to higher energies of the antiproton. On the other hand, a maximum of the differential cross section in the backward direction can also be found in the scattering of antiprotons on a bare uranium nucleus. The latter case can be regarded as a manifestation of the screening property of the vacuum-polarization potential in nonrelativistic collisions of heavy particles.

Parity-nonconservation effect in the dielectronic recombination of polarized electrons with heavy He-like ions

We investigate the parity nonconservation (PNC) effect in the dielectronic recombination (DR) of a polarized electron with a heavy He-like ion into doubly-excited

Parity nonconservation effect in resonance recombination of polarized electrons with heavy hydrogen-like ions

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Coherent population of magnetic sublevels of state in hydrogenlike uranium by radiative recombination

and

First observation of coherence in a highly charged ion

\left(\left(1s 2s\right)_{0} n{\kappa}\right)_{1/2}