Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Electronic Structure and Spin-Orbit Interaction II
O 16.10: Vortrag
Montag, 31. März 2014, 18:15–18:30, GER 38
Energy relations in positron-electron pair emission — •Frank O. Schumann1, Iuri S. Brandt1, Zheng Wei1, and Jürgen Kirschner1,2 — 1Max-Planck Institut für Mikrostrukturphysik, Halle, Germany — 2Martin-Luther Universität, Halle, Germany
The impact of a primary positron onto a surface leads to the emission of a correlated positron-electron pair. By means of a lab-based positron beam we studied this pair emission from a Ag(100) surface. We analyzed the energy spectra in a symmetric emission geometry. We found that the available energy is shared in an unequal manner among the partners. On average the positron carries a larger fraction of the available energy. The unequal energy sharing is a consequence of positron and electron being distinguishable particles. We provide a model which explains the experimental findings.