Dresden 2017 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Fluid Dynamics and Turbulence

DY 33.11: Talk

Wednesday, March 22, 2017, 12:45–13:00, ZEU 160

Transmission of Ultracold Neutrons Through Cold Deuterium and Hydrogen – The Scattering Cross Sections — •Stefan Döge^1,2,3, Peter Geltenbort², Tobias Jenke², Christoph Morkel¹, Erwin Gutsmiedl¹, Winfried Petry³, and Stephan Paul¹ — ¹Physik-Department, Technische Universität München, Garching, Germany — ²Institut Laue–Langevin, Grenoble, France — ³Forschungsneutronenquelle Heinz Maier-Leibnitz, Technische Universität München, Garching, Germany

Ultracold neutrons (UCNs) are a versatile tool for fundamental physics experiments, such as the exact determination of the free neutron lifetime or the search for a possible non-zero neutron EDM.

The precise knowledge of UCN cross sections in deuterium are pivotal to the design and improvement of new UCN sources, which promise to provide higher UCN densities than the current frontrunner – the “turbine” at Institut Laue–Langevin (ILL).

The total UCN cross sections in hydrogen and deuterium were measured in transmission geometry with a time-of-flight (TOF) setup and were corrected for several side effects like UCN scattering on surfaces etc. We present energy-dependent cross section data (σ^scatt) for UCNs in liquid and solid deuterium and hydrogen and discuss newly detected phenomena.

[1] S. Döge et al., Phys. Rev. B 91, 214309 (2015) and arXiv:1511.07065 [nucl-ex]

[2] S. Döge et al., ISINN-23 Proceedings, p. 119-130, Dubna/Russia (2016)