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

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 124Sb– 9Be 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. Furthermore, 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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4]
  1. The Univ. of Chicago, Chicago, IL (United States)
  2. The Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Univ. Federal do Rio de Janeiro, Rio de Janeiro (Brazil)
Publication Date:
Report Number(s):
arXiv:1608.00957; FERMILAB-PUB-16-664-AE-PPD
Journal ID: ISSN 2470-0010; PRVDAQ; 1478963; TRN: US1701514
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 8; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1350524

Chavarria, A. E., Collar, J. I., Peña, J. R., Privitera, P., Robinson, A. E., Scholz, B., Sengul, C., Zhou, J., Estrada, J., Izraelevitch, F., Tiffenberg, J., de Mello Neto, J. R. T., and Machado, D. Torres. Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector. United States: N. p., Web. doi:10.1103/PhysRevD.94.082007.
Chavarria, A. E., Collar, J. I., Peña, J. R., Privitera, P., Robinson, A. E., Scholz, B., Sengul, C., Zhou, J., Estrada, J., Izraelevitch, F., Tiffenberg, J., de Mello Neto, J. R. T., & Machado, D. Torres. Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector. United States. doi:10.1103/PhysRevD.94.082007.
Chavarria, A. E., Collar, J. I., Peña, J. R., Privitera, P., Robinson, A. E., Scholz, B., Sengul, C., Zhou, J., Estrada, J., Izraelevitch, F., Tiffenberg, J., de Mello Neto, J. R. T., and Machado, D. Torres. 2016. "Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector". United States. doi:10.1103/PhysRevD.94.082007. https://www.osti.gov/servlets/purl/1350524.
@article{osti_1350524,
title = {Measurement of the ionization produced by sub-keV silicon nuclear recoils in a CCD dark matter detector},
author = {Chavarria, A. E. and Collar, J. I. and Peña, J. R. and Privitera, P. and Robinson, A. E. and Scholz, B. and Sengul, C. and Zhou, J. and Estrada, J. and Izraelevitch, F. and Tiffenberg, J. and de Mello Neto, J. R. T. and Machado, D. Torres},
abstractNote = {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 124Sb–9Be 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. Furthermore, 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.},
doi = {10.1103/PhysRevD.94.082007},
journal = {Physical Review D},
number = 8,
volume = 94,
place = {United States},
year = {2016},
month = {10}
}