Abstract
Abstract
We characterize the performance of two pixelated neutron
detectors: a PMT-based array that utilizes Anger logic for pixel
identification and a SiPM-based array that employs individual pixel
readout. The SiPM-based array offers improved performance over the
previously developed PMT-based detector both in terms of uniformity
and neutron detection efficiency. Each detector array uses
PSD-capable plastic scintillator as a detection medium. We describe
the calibration and neutron efficiency measurement of both detectors
using a 137Cs source for energy calibration and a 252Cf
source for calibration of the neutron response. We find that the
intrinsic neutron detection efficiency of the SiPM-based array is
(30.2 ± 0.9)%, which is almost twice that of the PMT-based
array, which we measure to be (16.9 ± 0.1)%.