An accurate characterization of the neutron fields at spallation sources is crucial for many applications based on neutron irradiations, such as radiation damage tests that need a precise dose estimate. In this work we present the neutron flux measurements performed with the multi-foil activation technique in the ROTAX and ChipIr beamlines of the ISIS spallation source, characterized by moderated and unmoderated spectra, respectively. We selected many different activation reactions to cover a wide energy range, from thermal to very fast neutrons up to about 100 MeV. By applying a Bayesian unfolding algorithm, we demonstrate the effectiveness of this technique in measuring the neutron flux intensity and energy spectrum with precision and accuracy.
@article{arxiv.2110.05073,
title = {Measurements of neutron fields in a wide energy range using multi-foil activation analysis},
author = {D. Chiesa and C. Cazzaniga and M. Nastasi and M. Rebai and C. D. Frost and G. Gorini and S. Lilley and S. Pozzi and E. Previtali},
journal= {arXiv preprint arXiv:2110.05073},
year = {2022}
}
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