Calculation of Neutron Yield from Radioactivity in Materials Relevant to Dark Matter Searches

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The sensitivity of future large-scale dark matter detectors may be limited by neutrons produced in detector components. For this reason it is important to use pure materials and estimate the background from this source. Neutrons are produced via spontaneous fission and (α, n) reactions from U and Th traces in the materials. To estimate neutron yields and spectra, the cross-sections of (α, n) reactions and probabilities of transitions to different excited states should be known. In this work these cross-sections and probabilities are calculated using EMPIRE-2.19 for some isotopes and compared to the experimental data. The results have been used to calculate neutron spectra from materials with the code SOURCES4. We plan to create a database of the (α, n) cross sections and neutron spectra for materials used in dark matter detectors. This work is on-going as part of the EU FP6 programme ILIAS.

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