indico  First event Previous event Molecular Physics seminar Next event Last event   | view:  |  manage export to personal scheduler  | 
user login 


A method for extracting the resonance parameters from experimental cross sections
  Molecular Physics seminar

Monday 21 October 2013
from 10:00 to 11:00
Speaker : Sergei Rakitianski (Department of Physics, University of Pretoria)
Abstract : Within the proposed method, a set of experimental data points are fitted using a multi-channel S-matrix. Then the resonance parameters are located as its poles on an appropriate sheet of the Riemann surface of the energy. The main advantage of the method is that the S-matrix is constructed in such a way that it has proper analytic structure, i.e. for any number of two-body channels, the branching at all the channel thresholds is represented via exact analytic expressions in terms of the channel momenta. The way the S-matrix is constructed makes it possible not only to locate multi-channel resonances but also to extract their partial widths as well as to obtain the scattering cross-section in the channels for which no data are available. The efficiency of the method is demonstrated by two model examples of a single-channel and a two-channel problems, where known resonance parameters are rather accurately reproduced by fitting the pseudo-data artificially generated using the corresponding potentials.

Nordita  | Last modified 17 October 2013 19:44  |  HELP