  The study of the neutron response and n-gamma discrimination for small
(18x26x8) mm3 liquid scintillator BC501A (Bicron) detector was carried out by
digital charge comparison method. Three ranges of neutron energies were used:
uniform distribution from 0.95 MeV to 1.23 MeV, continuous spectra of AmBe
source and monoenergetic 16.2 MeV neutrons. The obtained results are compared
with those for cylindrical liquid scintillation detector (40 mm diameter, 60 mm
length) at the same energies of neutrons. A dramatic fall of the neutron
response function at 400 keVee for small detector at 16.2 MeV neutron energy
was measured. For (0.95 - 1.23) MeV neutron energy range such fall takes place
at 260 keVee. The greater slope of neutron locus at (0.95 - 1.23) MeV neutron
energy comparing to 16.2 MeV for both detectors is explained by longer tail of
pulse from proton recoils within (0.1-1.23) MeV energy range.
