It uses the data shown in the online table of neutron scattering lengths and cross sections . It is meant to assist users in determining the instrument configuration which optimizes the instrument to collect data on the desired features in the sample. Calculate SANS data on the web. If you are using a browser that can run Java 1.0.2 code you can calculate SANS data using any of 20 different particle models. You can also smear the SANS data using a set of instrument parameters which you can vary to simulate experimental conditions.
More documentation is on the way.
You can view the Java source files for the models here . Just click on the .java files to see the source. Calculate neutron reflectivities on the web. Make a model profile with layers, define the fronting and backing media and calculate neutron reflectivities. The ability to smear these reflectivities to different types of resolution will come as soon as I can come up with a less computationally intensive way of calculating it.