Igor Bray

Close-coupling approach to antiproton-impact ionisation of H2 with analytical spherical averaging

Integrated cross section for single ionisation of molecular hydrogen by antiproton impact has been calculated in a wide range of impact energies from 1 keV up to 2 MeV using a close-coupling approach. For the first time all possible orientations of the molecular target have been accounted for using an ab initio analytical spherical averaging technique. Obtained results are in good agreement with experiment.

Role of Target Resonances In Low-energy nucleon and α Interactions with Weakly-bound Nuclei

Radioactive ion beams of weakly bound nuclei are now being used to investigate properties of nuclear systems well off of the valley of stability. Those ions can and do have low excitation spectra that involve particle unstable resonances. We seek to describe the spectra of the compound systems formed, and the low energy nscattering cross sections for clusters formed coupling a nucleon or an

Calculations of electron and positron scattering from vibrationally excited H2+ and H2

alpha

Ionisation of noble gas atoms and H2O by antiproton impact

-particle with such weakly bound systems.

Nonperturbative electron-ion scattering theory incorporating the Møller interaction

Electron and positron scattering from the vibrationally excited H2+ and H2 molecules were investigated using the adiabatic-nuclei convergent close-coupling method. Converged results are presented for a range of vibrationally excited states.

Breit interaction effect on the polarization of the Lyman- a1 x-ray line emitted by hydrogen-like ions excited by electron impact

A time-dependent convergent close-coupling approach to antiproton collisions with noble gas atoms and H2O has been developed using a fully multielectron treatment of the targets. Integrated cross sections for single ionisation have been calculated in a wide range of impact energies from 5 keV up to 2 MeV. Obtained results are in good agreement with experiment.

Tracing multiple scattering patterns in absolute (e,2e) cross sections for H2 and He over a 4π solid angle

We present the first calculations that investigate the effects of both the Moller interaction and close-coupling in the calculation of electron-impact excitation cross sections. Electron scattering from U91+ is used as a test case. The RCCC method is nonperturbative and we emphasise the restrictions and subsequent limitations associated with employing the Moller interaction in the RCCC method.

Electron-impact excitation of the12S→22S+22Plevels of atomic hydrogen at 30, 40, 50, 54.4, and 100 eV

The relativistic convergent close-coupling (RCCC) method has been used to resolve the discrepancy between theory and experiment for the polarization of the Lyman-α1 x-ray line emitted by hydrogen-like Ti21+, Ar17+ and Fe25+ ions excited by electron impact. We find that account of Breit relativistic corrections is important to resolve the discrepancy between experiment and theoretical calculations.