ISIS Neutron and Muon Source Data Journal

On the behavior of light water cross section with temperature

Abstract: Water is the most widely used moderator in neutron sources and nuclear reactors. Despite this fact, thermalization in water is still computed with models that are based on and validated with experimental data measured decades ago. A new model predicts a reduction of the total cross section around 25 meV when the temperature is increased from room temperature. This reduction is not predicted by the existing models, and affects the calculation of temperature reactivity coefficients in nuclear reactors. This reduction has been traced to a shift in the frequency spectrum in liquid water.To test the models, a very delicate measurement of the total cross section is needed, with high statistics in the thermal and epithermal range. VESUVIO has the thermal flux intensity and a neutron spectrum that peaks at the required energy to provide high statistics for the proposed measurements.

Principal Investigator: Dr Javier Dawidowski
Experimenter: Dr Florencia Cantargi
Local Contact: Professor Giovanni Romanelli
Experimenter: Dr Goran Skoro
Experimenter: Dr Granada
Experimenter: Dr Gabriel Cuello
Experimenter: Dr Jose Ignacio Marquez Damian

DOI: 10.5286/ISIS.E.RB1810191

ISIS Experiment Number: RB1810191

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Javier Dawidowski et al; (2018): On the behavior of light water cross section with temperature, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1810191

Data is released under the CC-BY-4.0 license.