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| Hauptseite > Publikationsdatenbank > Determination of effective temperatures through affordable concurrent techniques in CANS |
| Hauptseite > Publikationsdatenbank > Determination of effective temperatures through affordable concurrent techniques in CANS |
| Conference Presentation (Invited) | FZJ-2023-04037 |
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2023
Abstract: The study of the interaction of neutrons with materials in the epithermal energy range is of interest in various fields of pure and applied physics. As a research tool, techniques involving epithermal neutrons have been used to study the kinetic energies of the atoms that make up the material. From the point of view of Nuclear Engineering, this is the range of energies that are necessarily traversed in moderation processes. From the point of view of applied physics, it is an essential range for the design of neutron sources associated with compact accelerators. It is therefore not surprising to find projects involving the use of epithermal neutrons in different contributions to this conference. It is also worth to mention that the studies that can be performed in this range of neutron energies are a distinctive feature of accelerator-based sources, as opposed to reactor-based ones.The effective temperatures of atoms differ from thermodynamic temperatures, and are determined not only by thermodynamic temperatures but also by the dynamics of matter, so that experimental neutron techniques, which allow the densities of vibrational states to be known, make it possible to evaluate them. However, in this case it is an indirect relation that allows access to these values by calculation. Yet, there are techniques that allow direct experimental access to these quantities. We refer to Deep Inelastic Neutron Scattering (DINS) and Neutron Transmission (NT). Both techniques can be performed on the VESUVIO spectrometer (ISIS, UK) during the same experiment, which eliminates the need to deal with different experimental set-ups when comparing data. Although ISIS is a large neutron source, it should be mentioned that these techniques were successfully carried out at the now defunct LINAC in Bariloche (Argentina), both by proof of concept and by providing competitive data to obtain relevant physical conclusions.In this talk we will show this capability through combined DINS and transmission experiments performed at ISIS and Bariloche in molecular liquids. We will show the different steps involved in the processing of the information and comment on the different possibilities for future use.
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