Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 45: Instrumentation und Anwendungen VI

HK 45.3: Gruppenbericht

Donnerstag, 20. März 2003, 17:30–18:00, C

Solid D₂ for its use in ultra-cold neutron production — •Klaus Kirch — Paul Scherrer Institut, CH-5232 Villigen PSI

Solid Deuterium (sD₂) can be efficiently used as moderator/converter material in ultra-cold neutron (UCN) sources, such as the PSI Spallation Ultra-cold Neutron Source (SUNS). While the production of UCN in sD₂ is assumed to be rather independent on the specific solid properties, the UCN extraction from sD₂ strongly varies as a function of the temperature, ortho-D₂ concentration, contaminants, crystal morphology, and methods of freezing. A dedicated research program has been started for measuring transmission and scattering properties of slow neutrons on differently prepared sD₂. During experiments with cold, very cold and ultra-cold neutrons, the quality of the sD₂ can be monitored simultaneously by optical means, such as in-situ Raman spectroscopy. The goal of the research is to understand the contributing physics processes and to learn how to produce the best suited sD₂. The talk gives an overview of the ongoing efforts, details about the experimental setup and results from optical studies.