Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] aeho_v1_0.tar.gz(154 Kbytes)|
|Manuscript Title: Extracting S-matrix poles for resonances from numerical scattering data: type-II Padé reconstruction|
|Authors: D. Sokolovski, E. Akhmatskaya, S.K. Sen|
|Program title: PADE II|
|Catalogue identifier: AEHO_v1_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 182(2011)448|
|Programming language: FORTRAN 77.|
|Computer: Any computer equipped with a FORTRAN 90 compiler.|
|Operating system: UNIX, LINUX.|
|RAM: 256 Mb|
|Keywords: Resonances, S-matrix, Padé approximation, Regge-poles.|
|PACS: 34.50.Lf, 34.50.Pi.|
External routines: NAG Program Library (http://www.nag.co.uk/numeric/fl/FLdescription.asp)
Nature of problem:
The package extracts the positions and residues of resonance poles from numerical scattering data supplied by the user. The data can then be used for quantitative analysis of interference patterns observed in elastic, inelastic and reactive integral and differential cross sections.
The S-matrix element is analytically continued in the complex plane of either energy or angular momentum with the help of Padé approximation of type II. Resonance (complex energy or Regge) poles are identified and their residues evaluated.
Use of multiple precision MPFUN package . (Distributed with the PADE II code).
From several seconds to several minutes depending on the precision level chosen and the number of iterations performed.
|||D. H. Bailey, Algorithm 719, Multiprecision translation and execution of Fortran programs . ACM Transactions on Mathematical Software, 19(3), (1993) 288.|
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