Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.10: Poster

Mittwoch, 3. April 2019, 16:00–18:30, Poster C

Ultra-cold neutron reflectivity and storage properties of ultra-nanocrystalline diamond films — •Hadwig Sternschulte1,2, Andreas Frei2, Peter Geltenbort3, Christopher Geppert4, Christian Gorges4, Petra Müschenborn2, Stefan Wenisch2, Stephan Wlokka2, and Nicolas Wöhrl51Hochschule Augsburg, Germany — 2Heinz Maier-Leibnitz Zentrum, Technische Universität München, Germany — 3Institut Laue-Langevin, Grenoble, France — 4Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Germany — 5Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany

Ultra-cold neutrons (UCN) have kinetic energies of <300 neV and are used for high precision experiments such as the search for a non zero electrical dipole moment or an accurate determination of the neutron life time. To avoid disturbances the set-up is not located directly at the UCN source and the UCN are transported via total reflection from the source to the experiment. 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 reflectivity and storage properties will be discussed.

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