| Summary: | This work is focused on an accurate experimental determination of the thermal <sup>33</sup>S(<i>n</i>,<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>α</mi></semantics></math></inline-formula>)<sup>30</sup>Si cross-section. This cross-section is a critical parameter for the potential use of <sup>33</sup>S as a cooperative target in boron neutron capture therapy or to understand its role in the stellar nucleosynthesis of <sup>36</sup>S. At present, there are large discrepancies in this experimental value; therefore, in this work we measured it relative to the <sup>10</sup>B(<i>n</i>,<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>α</mi></semantics></math></inline-formula>)<sup>7</sup>Li standard cross-section at the high flux reactor of the Institut Laue-Langevin. The experimental setup was based on a double-sided silicon strip detector. Two <sup>33</sup>S samples were used. One <sup>10</sup>B sample was used as reference. Particular attention was taken to the characterization of the mass thickness of the samples before and after the experiment because of the high volatility of <sup>33</sup>S. Such work was already published in a dedicated paper. A cross-check of the <sup>10</sup>B sample was carried out with the neutron flux monitor at the n_TOF-CERN facility. The obtained cross-section of (280 ± 33) mb is significantly higher than the existing data.
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