1304.4536 (C. Zhang et al.)

Measuring Fast Neutrons with Large Liquid Scintillation Detector for
Ultra-low Background Experiments    [PDF]

C. Zhang, D. -M. Mei, P. Davis, B. Woltman, F. Gray

We developed a 12-liter volume neutron detector filled with the liquid scintillator EJ301 that measures neutrons in an underground laboratory where dark matter and neutrino experiments are located. The detector target is a cylindrical volume coated on the inside with reflective paint (95% reflectivity) that significantly increases the detector's light collection. We demonstrate several calibration techniques using point sources and cosmic-ray muons for energies up to 20 MeV for this large liquid scintillation detector. Neutron-gamma separation using pulse shape discrimination with a few MeV neutrons to hundreds of MeV neutrons is shown for the first time using a large liquid scintillator.

View original: http://arxiv.org/abs/1304.4536