Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Electron scattering and recombination

A 37.5: Vortrag

Donnerstag, 20. März 2014, 11:45–12:00, BEBEL E42

Pair production and annihilation via nuclear resonances in atoms and ions — •Nikolay A. Belov and Zoltan Harman — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

Processes connected with pair production and annihilation in atoms and ions are theoretically investigated. These include nuclear excitation by resonance positron annihilation (NERPA) and nuclear-resonant e⁻e⁺ pair creation in heavy ion collisions. Possible experimental schemes are put forward for the observation of these reactions. NERPA is an alternative channel of positron-matter interaction, with potential relevance in cosmic ray studies, medical positron emission tomography research, in experimental investigations of nuclear chain reactions, and in star evolution simulations. It also constitutes a novel means for the energy-selective excitation of nuclei. In heavy ion collisions, the Coulomb-excited nucleus may decay by a creation of a free-free or bound-free e⁻e⁺ pair. Thus, it is an additional, resonant channel of pair creation in nucleus-nucleus collisions, an experimental investigation of which is projected at the FAIR facility.