title: Energy relations of positron-electron pairs emitted from surfaces.
abstract: The impact of a primary positron onto a surface may lead to the emission of a correlated positron-electron pair. By means of a lab-based positron beam we studied this pair emission from various surfaces. 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.
authors.affiliation: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
authors.forename: I S
authors.initials: IS
authors.lastname: Brandt
authors.affiliation: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
authors.forename: Z
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
authors.forename: F O
authors.initials: FO
authors.lastname: Schumann
authors.affiliation: Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany and Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Kirschner