Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.34: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Interaction of swift heavy- ion beams with insulating targets — G Lanzanó1, E De Filippo1, I Lombardo1, E La Guidara1, F Amorini1, N Rizzo1, G Politi1, E Geraci1, P Russotto1, G Cardella1, C Volant2, H Rothard3, and •S Hagmann4,5 — 1INFN+LNS, Catania, Italy — 2CEA, Saclay, France — 3CIMAP-CIRIL-GANIL,Caen, France — 4GSI-Darmstadt, Germany — 5Inst.f Kernphysik, Univ Frankfurt, Germany
The interaction of ion beams with solids leads to ejection of electrons. For insulating targets, a charging-up of the surface occurs. At present,such phenomena are under inves-tigation in connection with guiding phenomena in nano-cap-illaries with the possible application of nano focused beams. Here, we report the results of a series of dedicated experiments with swift ion beams (C at 23 and 40 AMeV, but also heavier beams such as Ag at 40 A MeV and Xe at 23 and 30 AMeV) and insulating foil targets (Mylar,polypropylene). Also, sandwich-targets (insulators covered with a thin gold layer on one or both surfaces)were used. Fast electron spectra were measured by the time-of-flight method with the ARGOS multidetector at the superconducting cyclotron of LNS Catania. The slowing down of convoy- and binary encounter electrons allows to observe the dynamics of charge build-up leading to potentials of the order of 10 kV [1]. Surprisingly, also X-rays emitted from the projectile are affected by the charged surface, and puzzling results are observed with the double sandwich target. [1] G. Lanzanò, E. De Filippo, S. Hagmann, H. Rothard, C. Volant Rad. Eff. and Defects in Solids 162 (2007) 303-318