Doorway Mechanism in Many Body Systems and in Quantum Billiards

T. Guhr Fachbereich Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany

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Among the numerous different ways to excite many body and other complex quantum systems, mechanisms are often found which are clearly distinguished by a simple, typically semiclassical interpretation. In nuclei, these are the collective excitations in which all or large groups of particles move coherently. They often act as "doorways" to other excitations of single particle character. Examples for and the limitations of the doorway mechanism are discussed. Recent results show that superscars in the barrier billiard serve as perfect object to shed light on aspects of the doorway mechanism which are not directly accessible in traditional quantum systems. To this end, two new statistical observables are employed. Some open questions are addressed.

DOI: 10.12693/APhysPolA.116.741 PACS numbers: 05.45.Mt, 03.65.Sq, 24.30.Cz, 21.10.Pc