Abstract
In order to understand the origin of one-body dissipation in nuclei, we analyze the behavior of a gas of classical particles moving in a two-dimensional cavity with nuclear dimensions. This ``nuclear'' billiard has multipole-deformed walls which undergo periodic shape oscillations. We demonstrate that a single-particle Hamiltonian containing coupling terms between the particle motion and the collective coordinate induces a chaotic dynamics for any multipolarity, independently of the geometry of the billiard. If the coupling terms are switched off, the ``wall formula'' predictions are recovered. We discuss the dissipative behavior of the wall motion and its relation to the order-to-chaos transition in the dynamics of the microscopic degrees of freedom.
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