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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Postersitzung
HK 34.97: Poster
Donnerstag, 13. März 2008, 14:00–16:00, Poster C3
Simulation of compound nucleus reactions with microwave billiards in the region of overlapping levels — Barbara Dietz1, •Thomas Friedrich1, Hanns Ludwig Harney2, Maksim Miski-Oglu1, Achim Richter1, Florian Schäfer1, and Hans Weidenmüller2 — 1Institut für Kernphysik, TU Darmstadt — 2Max Planck Institut für Kernphysik, Heidelberg
The excitation cross section of compound nucleus reactions exhibits either isolated resonances, or fluctuates when resonances overlap strongly in the Ericson regime due to high level density. This scenario can be simulated using flat microwave cavities. We measured the complex scattering matrix of a microwave cavity in an intermediate regime where the system decays non-exponentially. In the framework of random matrix theory the fluctuations are modelled by an expression of Verbaarschot, Weidenmüller, and Zirnbauer for the scattering via quantum chaotic systems. We developed a statistical test for this model and find that it describes the measured data as long as the dynamics of the system is purely chaotic. This in turn provides a tool to explore the dynamics of a resonating system.