Speaker
Prof.
Dieter Heiss
(Department of Physics)
Description
We propose a general and schematic approach to characterize fluctuations of measured cross sections of nuclear giant
resonances. Cross sections are obtained from simulated, yet representative, forms for the self-energy which contains
information about fragmentations. Using a wavelet analysis, we demonstrate the extraction of time scales of cascading decays of the resonance into configurations of increasing complexity. We argue that the spreading widths of collective excitations in nuclei are determined by the number of fragmentations as seen in the power spectrum. An analytic treatment of the wavelet analysis using a Fourier expansion of the cross section confirms this principle. A simple rule for the relative lifetimes of states with different complexity is obtained.
Primary author
Prof.
Dieter Heiss
(Department of Physics)
Co-authors
Dr
Rashid Nazmitdinov
(JINR, Dubna/Russia)
Dr
Ricky Smit
(IThembaLabs)
