  Digitization of detector signals enables analysis of the original waveform to
extract timing, particle identification, and energy deposition information.
Here we present the use of analytical functions based on sigmoids to model and
fit such pulse shapes from liquid organic scintillators, though the method
should also be applicable to other detector systems. Neutron and gamma
interactions in NE213 detectors were digitized from the phototube anode and fit
using a sigmoid-based function. The acuity of the fit in extracting timing
information and performing neutron-gamma pulse-shape discrimination are
presented and discussed.
