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We present a characterization of a small (9-liter) and mobile 0.1% 6Li-dopedpulse-shape-sensitive plastic scintillator antineutrino detector called SANDD(Segmented AntiNeutrino Directional Detector), constructed for the purpose ofnear-field reactor monitoring with sensitivity to antineutrino direction. SANDDcomprises three different types of module. A detailed Monte Carlo simulationcode was developed to match and validate the performance of each of the threemodules. The combined model was then used to produce a prediction of theperformance of the entire detector. Analysis cuts were established to isolateantineutrino inverse beta decay events while rejecting large fraction ofbackgrounds. The neutron and positron detection efficiencies are estimated tobe 34.8% and 80.2%, respectively, while the coincidence detection efficiency isestimated to be 71.7%, resulting in inverse beta decay detection efficiency of20.05 +/- 0.2%(stat.) +/- 2.1%(syst.). The predicted directional sensitivity ofSANDD produces an uncertainty of 20 degree in the azimuthal direction per 100detected antineutrino events.

SANDD: A directional antineutrino detector with segmented 6Li-doped pulse-shape-sensitive plastic scintillator