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| Abstract | FZJ-2021-03011 |
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2021
Please use a persistent id in citations: http://hdl.handle.net/2128/28185
Abstract: The shutdown of several national reactor driven neutron sources has stimulated intense research and development activities for successor facilities[1]. A promising technology is the neutron production by low energy nuclear reactions, that can be driven by accelerators operating in the particle energy range between 3 and 100 MeV. While the neutron yield of theses reactions is much lower than the neutron yield of the spallation reaction, the lower particle energy enables a very close coupling of the thermal and cryogenic moderators to the target and therefore small volume moderators with a high density of slow neutrons. On the other hand, the comparably low particle energies facilitate the shielding issue significantly and allow therefore neutron optical components in a distance as close as 50 cm from the thermal or cold moderator surfaces allowing the extraction of a reasonably divergent beam from the source, which can be efficiently transported to the sample by modern neutron optics. Therefore instruments, which require a large phase space, can benefit strongly from the characteristics of a low energy accelerator driven neutron facility (LENF). Among them are typically spectrometers of both direct and indirect geometry, which require typically relaxed spatial and angular resolution and a good energy resolution. Here we present source parameters that have been determined for different spectrometers employing thermal and cold neutrons.
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