Mainz 2017 – wissenschaftliches Programm

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SYAP: Symposium Atomic and Plasma Physics at FAIR

SYAP 1: Atomic and Plasma Physics at FAIR

SYAP 1.3: Hauptvortrag

Dienstag, 7. März 2017, 12:00–12:30, P 1

Strong-field effects in heavy-ion collisions — •Andrey Surzhykov^1,2, Vladimir Yerokhin³, Thomas Stöhlker⁴, and Stephan Fritzsche⁴ — ¹Physikalisch-Technische Bundesanstalt, Germany — ²Technische Universität Braunschweig, Germany — ³Peter the Great St. Petersburg Polytechnic University, Russia — ⁴Helmholtz-Institut Jena, Germany

A series of experiments are planned to be performed at the future FAIR facility with the aim of studying strong-field phenomena in heavy-ion collisions. Of special interest here is the electron-positron pair production either for low projectile velocities, for which super-heavy quasi-molecules can be formed, or in strong relativistic regime. In this presentation, we will review recent theoretical advances in the description of both low– and high–energy ion–atom and ion–ion collisions. In particular, we discuss the non-perturbative treatment of the electron dynamics in quasi-molecular systems, such as U⁹²⁺ + U⁹¹⁺. For the high-energy regime, new predictions will be presented for the recombination of a target electron into a bound state of an initially bare nucleus with the simultaneous creation of a e⁺–e⁻ pair. For this so-called negative continuum dielectronic recombination (NCDR) process we study the effects of the atomic target on the single and double-differential cross sections [1]. Finally, the lepton pair production in highly-relativistic bare ion collisions will be revisited with the special focus on the angular distribution of emitted positrons.

[1] V. A. Yerokhin et al., Phys. Rev. A 92, 042708 (2015).