Detection efficiency loss in a position sensitive scintillator hodoscope neutron detector

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Abstract

A position sensitive detector for 15 MeV neutrons has been built from four NE110 plastic scintillator slabs all together connected to a left and a right photomultiplier. A hodoscope detection system tags each optically isolated scintillating slab, minimizing the transit time spread. Adopting left and right light guides common to the four slabs, a strong decrease of the detection efficiency is found when single slab information is requested, mostly ascribed to the hodoscope detectors multiple firing after light reflection in the common light guides. An improvement of the light collection system is suggested and tested.

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