  We report the performance and characterization of a custom-built hybrid
detector consisting of BC501A liquid scintillator for fast neutrons and BC702
scintillator for thermal neutrons. The calibration and the resolution of the
BC501A liquid scintillator detector are performed. The event identification via
Pulse Shape Discrimination (PSD) technique is developed in order to distinguish
gamma, fast and thermal neutrons. Monte Carlo simulation packages are developed
in GEANT4 to obtain actual neutron energy spectrum from the measured recoil
spectrum. The developed methods are tested by reconstruction of 241AmBe(\alpha,
n) neutron spectrum.
