New detector concept with neutron interaction localization capabilities.

A new high precision time of flight neutron detector concept for beta-delayed neutron emission and direct reaction studies is proposed. The Neutron dEtector with Xn Tracking (NEXT) array aims to maintain high intrinsic neutron detection efficiency while reducing uncertainties in neutron energy measurements. A single NEXT module will be composed of thin segments of neutron-discriminating plastic scintillator, each optically separated, coupled to a position sensitive photo-detector. By incorporating a position sensitive photo-detector with a large optically separated scintillator, NEXT will achieve high precision determination of neutron time of arrival and interaction position within the active volume. A design study has been conducted based on simulations and experimental tests leading to construction of prototype units. First results from neutron measurements will be discussed.