Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 9: Postersitzung: Instrumentation und Anwendungen

HK 9.25: Poster

Tuesday, March 20, 2001, 10:30–12:45, R

Mini-D₂ - A source for ultracold neutrons at the FRM-II — •Stephan Gröger, Igor Altarev, Franz Joachim Hartmann, Stephan Paul, Gerd Petzoldt, Wolfgang Schott, and Uwe Trinks — Technische Universität München, Physik Department

The new Munich high-flux reactor FRM-II offers the possibility to install a unique source for ultracold neutrons (UCN), the Mini-D₂ UCN source, with a small volume of solid deuterium at a temperature of 5 K as converter, exposed to the cold neutron flux. This new source, being dedicated for storage experiments, is designed to be much superior to any existing UCN facility. In the pulsed operation mode the Mini-D₂ source is expected to provide UCN densities up to 10⁴ n/cm³. The large gain factor will enable new precision measurements of elementary properties of the free neutron, especially the electric dipole moment, the lifetime, and the angular correlation coefficients of the decay. These quantities are of fundamental interest in particle physics. Operated in the continuous mode, the UCN source will provide an UCN flux density of up to 5 ·10⁵ n/cm²s at the exit.

The design was examined by the experts of the technical safety authorities (TÜV) with positive result. A test facility for investigations of the solid D₂ under various conditions, strong pulsed neutron and gamma radiation e.g., is in progress. The present status of the project will be presented.