Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector

A.E. Chavarria; A.E. Robinson; B. Scholz; C. Sengul; D. Torres Machado; F. Izraelevitch; J. Estrada; J.I. Collar; J.R. Pe\~na; J.R.T. de Mello Neto

Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector

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arxiv 1608.00957 v2 pith:37A4EBWO submitted 2016-08-02 astro-ph.IM astro-ph.COhep-exhep-phphysics.ins-det

Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector

A.E. Chavarria , J.I. Collar , J.R. Pe\~na , P. Privitera , A.E. Robinson , B. Scholz , C. Sengul , J. Zhou

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J. Estrada F. Izraelevitch J. Tiffenberg J.R.T. de Mello Neto D. Torres Machado

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classification astro-ph.IM astro-ph.COhep-exhep-phphysics.ins-det

keywords darkionizationmattermeasurementnuclearrecoilssilicondetection

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We report a measurement of the ionization efficiency of silicon nuclei recoiling with sub-keV kinetic energy in the bulk silicon of a charge-coupled device (CCD). Nuclear recoils are produced by low-energy neutrons ($<$24 keV) from a $^{124}$Sb-$^{9}$Be photoneutron source, and their ionization signal is measured down to 60 eV electron equivalent. This energy range, previously unexplored, is relevant for the detection of low-mass dark matter particles. The measured efficiency is found to deviate from the extrapolation to low energies of the Lindhard model. This measurement also demonstrates the sensitivity to nuclear recoils of CCDs employed by DAMIC, a dark matter direct detection experiment located in the SNOLAB underground laboratory.

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