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4月13日|Relativistic coupled-channel calculations of quantum dynamic of electrons in low-energy heavy ion-atom collisions
2017-04-07 | 【 【打印】【关闭】
    

  报告题目:Relativistic coupled-channel calculations of quantum dynamic of electrons  in low-energy heavy ion-atom collisions 

  报告人:Dr. Yury Kozhedub 

  Department of Physics, Siant-Petersburg State University, Russia 

  时间:2017413日(星期四)上午1030  

  地点:近代物理所5号楼911会议室 

  AbstractUltrastrong electromagnetic fields occur in highly-charged heavy ions and can be further increased up to supercritical regime in experiments with heavy ions passing each other. One of the most attractive ways for indirect observation of the supercritical field is to investigate the dynamics of inner-shell electrons in heavy-ion collisions. In the talk, a coupled-channel approach for evaluation of relativistic quantum dynamics of electrons is presented. The method is based on an independent particle model, where the many-particle Hamiltonian is approximated by a sum of single-particle Hamiltonians, thus reducing the electronic many-particle problem to a set of single-particle equations for all electrons in the collision system (including negative-energy continuum ones). After solving this set of effective single-particle equations, the many-particle probabilities (including pair-creation probabilities) can be calculated. Solving the effective single-particle equations is based on the coupled-channel approach with atomic-like Dirac-Fock and Dirac-Fock-Sturm orbitals, localized at the ions (atoms).  These orbitals are obtained by solving numerically the one-center Dirac-Fock  and Dirac-Fock-Sturm equations, respectively. Using the evaluated values of cross section and a X-ray radiative analysis, based on fluorescence yields, radiation and Auger decay individual rates, we obtained X-ray emission intensities that can be compared with experimental data. This approach was successfully applied to calculations of relativistic quantum dynamics of electrons in low-energy heavy-ions collisions. The role of relativistic effects is analyzed. 

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