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Damping of giant resonances in a stochastic two-level model
Affiliation:1. Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing, 100875, China;2. Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA;1. Nuclear Physics Laboratory, Department of Physics, Aligarh Muslim University, Aligarh - 202 002, India;2. Centre for Applied Physics, Central University of Jharkhand, Ranchi - 835 205, India;3. Department of Physics, G. F. (P. G.) College, Shahjahanpur - 242 001, India;4. Department of Physics, Jamal Mohammed College, Tiruchirappalli - 620 020, India;5. Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi - 110 067, India;1. Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russia;2. Dubna State University, Dubna, Russia;3. Chuvash State University, Cheboksary, Russia;1. Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, F-91406 Orsay Cedex, France;2. CEA, DAM, DIF, 91297 Arpajon, France;3. Nuclear and Chemical Science Division, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA
Abstract:We derive a theory for small amplitude motion about states in thermal equilibrium. This motion couples mean-field oscillations and occupation number relaxations. The theory contains the effects of two-body collisions treated beyond the Markov approximation. The damping of collective modes is studied in a stochastic two-level model. The widths of giant resonances in finite nuclei are estimated using sum rules.
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