1. Introduction

Astrophysica for Windows performs calculations for astrophysical applications:

__Rate calculations__Non-resonant rates can be calculated from the corresponding S factors. S-factors are given either from a data file, or from calculated values (R-matrix or potential model- see below). Resonant rates are calculated from resonance data. Tail contributions are taken into account

The reaction rates are provided in a tabular form, with analytical approximations. They can be compared with the Caltech or NACRE results.

__R-matrix calculations__Capture cross sections can be calculated with the R-matrix formalism. Input data are observed values, which correspond to experimental data. The link between observed and calculated parameters is performed as explaind in Ref. (C. Angulo and P. Descouvemont, Phys. Rev. C60,...,2000). External contribution is taken into account. The program performs fits of the data starting from approximate paramater values.

Final results can be used to compute the reaction rate.

__Potential model__Woods-Saxon or Gaussian potentials can be used. Final results can be used to compute the reaction rate.

__Downloading data files from the NACRE server__If you have an Internet connection, S-factor files can be downloaded from the NACRE server (http://pntpm3.ulb.ac.be/nacre.htm). These data can be saved for further use, to compute reaction rates or to perform R-matrix fits. Experimental S-factors for about 80 reactions are currently available.

Please report any comment, bug, problem, suggestion, etc... to

Pierre Descouvemont

Université Libre de
Bruxelles

Email: pdesc@ulb.ac.be