Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 7: Wechselwirkung von Materie mit Ionen
A 7.2: Vortrag
Dienstag, 14. März 2006, 14:45–15:00, H7
Correlated electron emission in collisions of Krypton ions (64 MeV/u) with Carbon targets — •Hermann Rothard1, Gaetano Lanzano2, Enrico De Filippo2, Siegbert Hagmann3, and Claude Volant4 — 1CIRIL-Ganil (CEA/CNRS/ENSICAEN/Univ. de Caen), BP5133, F-14070 Caen Cedex 05, France — 2INFN and Dipartimento di Fisica e Astronomia, Via S. Sofia 64, I-95123 Catania, Italy — 3IKF, Univ. Frankfurt, D-60438 Frankfurt am Main, and GSI, D-64291 Darmstadt, Germany — 4DAPNIA/SPhN, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France
The large detector array ARGOS, initially designed for nuclear physics studies, was adapted for the study of electron emission in atomic collisions and used at GANIL and at LNS/Catania. We measured the angular dependence of binary encounter-, convoy-, and in-flight emitted projectile Auger electrons with a Kr beam (q=32 and 34, 64 MeV/u) traversing thin carbon foils at GANIL. A unique feature of the ARGOS multidetector is the possibility to measure the coincident emission of particles. Therefore, the correlated emission of electrons can be observed (Nucl. Instrum. Meth. B205 (2003) 841). We present preliminary results on electron-electron coincidences between three sets of electron detectors. Two of them were placed in forward direction in a plane on the left- and right- hand side of the beam, one of them perpendicular to this plane. Only for in-plane coincidences a peak is observed which seems to be related to an inelastic binary encounter with momentum transfer to an inner shell projectile electron. This is a particular ionization process involving a target and a projectile electron simultaneously.