PkFit - A tool to fit the data from neutron three-axis spectrometers

PkFit - a user friendly software for the Macintosh, OpenVMS and UNIX workstations - is intended for the data processing of neutron three-axis spectrometers. Inelastic, quasi-elastic or elastic spectra are fitted by a linear background plus a series of peak functions. The program offers several built-in peak functions but the user may add its own peak shapes through stand-alone code resources. The model can include the Bose factor, the k(f), or k(i) correction, the neutron absorption and the convolution of the signal with a one-dimensional or a four-dimensional resolution function. The latter is calculated from the configuration parameters of the spectrometer through the help of the Cooper-Nathans method or the Popovici method. Fast 4D integration is performed by means of new methods, one based on a Monte-Carlo integration technique and the other based on a Gaussian approximation.