Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.6: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Electron-Positron Pair Creation in Heavy Ion Collisions — •Manuel Mai — Physikalisches Institut, Universität Heidelberg

A theoretical description of highly charged ion collisions is given. At collision energies near the Coulomb barrier the formation of so quasi molecules can happen, with a ground state that dives into the "Dirac sea" at short distances of the ions. In that way an electron-positron pair can be created.

For two ions traveling on classical Rutherford trajectories the two center Dirac equation is solved numerically with B-Splines. The solutions form a quasi complete set of basis functions at each instant of time. By means of coupled-channel calculations we perform the time evolution of the system, i.e. the transition from one basis set to another. Results are obtained in the monopole approximation in which only a monopole contribution of the potential is used in the Dirac equation.