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Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 38: Postersession

T 38.1: Poster

Dienstag, 10. März 2015, 13:00–13:45, Foyer Ebene G.10

Simulation and Optimisation of a Position Sensitive Scintillation Detector with Wavelength Shifting Fibers for Thermal Neutrons — •Matthias Herzkamp1, Thomas Brückel2, Ralf Engels1, Günter Kemmerling1, Achim Stahl3, and Stefan van Waasen1,41ZEA-2, Forschungszentrum Jülich, Deutschland — 2JCNS, Forschungszentrum Jülich, Deutschland — 3III. Physikalisches Institut B, RWTH Aachen, Deutschland — 4Faculty of Engineering, University of Duisburg-Essen, Deutschland

In neutron scattering experiments it is important to have position sensitive large scale detectors for thermal neutrons. A detector based on a neutron scintillator with wave length shifting fibers is a new kind of such a detector. We present the simulation of the detector based on the microscopic structure of the scintillation material of the mentioned detector. It consists of a converter and a scintillation powder bound in a matrix. The converter in our case is lithium fluoride with enriched lithium 6, to convert thermal neutrons into high energetic alpha and triton particles. The scintillation material is silver doped zinc sulfide. We show that pulse height spectra obtained by these scintillators can be be explained by the simple model of randomly distributed spheres of zinc sulfide and lithium fluoride. With this model, it is possible to optimise the mass ratio of zinc sulfide to lithium fluoride with respect to detection efficiency and/or energy deposition in zinc sulfide.

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