BornAgain is a software package to simulate and fit small-angle scattering at grazing incidence. It supports analysis of both X-ray (GISAXS) and neutron (GISANS) data. Calculations are carried out in the framework of the distorted wave Born approximation (DWBA). BornAgain provides a graphical user interface for interactive use as well as a generic Python and C++ framework for modeling multilayer samples with smooth or rough interfaces and with various types of embedded nanoparticles.

BornAgain supports:

Layers: * Multilayers without any restrictions on the number of layers * Interface roughness correlation * Magnetic materials

Particles: * Choice between different shapes of particles (form factors) * Particles with inner structures * Assemblies of particles * Size distribution of the particles (polydispersity)

Positions of Particles: * Decoupled implementations between vertical and planar positions * Vertical distributions: particles at specific depth in layers or on top. * Planar distributions: - fully disordered systems - short-range order distribution (paracrystals) - two- and one-dimensional lattices

Input Beam: * Polarized or unpolarized neutrons * X-ray * Divergence of the input beam (wavelength, incident angles) following different distributions * Possible normalization of the input intensity

Detector: * Off specular scattering * Two-dimensional intensity matrix, function of the output angles

Use of BornAgain: * Simulation of GISAXS and GISANS from the generated sample * Fitting to reference data (experimental or numerical) * Interactions via Python scripts or Graphical User Interface

If you use BornAgain in your work, please cite C. Durniak, M. Ganeva, G. Pospelov, W. Van Herck, J. Wuttke (2015), BornAgain — Software for simulating and fitting X-ray and neutron small-angle scattering at grazing incidence, version , http://www.bornagainproject.org

This package contains the Python bindings for use in scripts.