München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.45: Poster

Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium

Reflectivity and storage properties of ultra-nanocrystalline diamond films for ultracold neutrons — •Andreas Frei1, Peter Geltenbort2, Christopher Geppert3, Christian Gorges3, Petra Müschenborn1, Hadwig Sternschulte4, Stefan Wenisch1, Stephan Wlokka1, and Nicolas Wöhrl51Heinz Maier-Leibnitz-Zentrum, Technische Universität München — 2Institut Laue-Langevin, Grenoble — 3Institut für Kernchemie, Universität Mainz — 4Fakultät für Geistes- und Naturwissenschaften, Hochschule Augsburg — 5Fakultät für Physik, Universität Duisburg-Essen

Ultra-cold neutrons (UCN) have kinetic energies of <300 neV and are used for high precision experiments. UCN have to be transported in guides under specular reflection on the walls to such experiments over long distances with low losses.

Diamond is an excellent reflector for UCN due to the high atom density in combination with a large bound coherent scattering length and low loss cross sections. Ultra-nanocrystalline diamond (UNCD) films with a very low surface roughness independent of the film thickness can be grown on various 3D shaped substrates by chemical vapour deposition. Therefore they are promising candidates for UCN reflecting layers.

In this work we present studies of the UCN reflection and storage properties of UNCD thin films grown on planar 6” Si substrates. The influence of the UNCD film morphology and composition on the reflectity and storage properties will be discussed.

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