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SUMMARY:Characterization of argon recoils at the keV scale with ReD and Re
 D+
DTSTART;VALUE=DATE-TIME:20261030T153000Z
DTEND;VALUE=DATE-TIME:20261030T154500Z
DTSTAMP;VALUE=DATE-TIME:20261025T205007Z
UID:indico-contribution-6396@cern.ch
DESCRIPTION:Speakers: Simone Sanfilippo (INFN – LNS\, Catania (Italy))\n
 Dual-phase liquid argon time projection chambers (LAr TPCs) are widely use
 d in the direct\nsearch for weakly interacting massive particles (WIMPs)\,
  traditionally targeting masses of\nthe order of 100 GeV. Future-generatio
 n LAr TPCs aim to extend this search towards lower\nWIMP masses\, down to 
 the GeV scale. In this regime\, WIMP interactions are expected to\nproduce
  nuclear recoils (NRs) in liquid argon with energies of only a few keV\, w
 here the\ndetector response is still not fully characterized.\nTo address 
 this challenge\, the Recoil Directionality (ReD) experiment was developed 
 within\nthe DarkSide-20k Collaboration to produce and characterize few-keV
  nuclear recoils in liquid\nargon. A compact dual-phase LAr TPC was irradi
 ated with neutrons from a 252Cf source\,\nproducing argon nuclear recoils 
 through neutron scattering. A downstream spectrometer\nconsisting of 18 pl
 astic scintillators detected neutrons scattered by argon nuclei\, enabling
 \nthe recoil energy to be reconstructed through two-body kinematics. This 
 technique allowed\nthe ionization yield of liquid argon\, Q_y\, defined as
  the number of electrons produced per\nunit energy deposition\, to be meas
 ured in a model-independent manner down to 2 keV.\nThe measured Q_y is fou
 nd to be consistent with existing measurements at higher recoil\nenergies\
 , while showing an increase towards lower energies. These results provide 
 new\nexperimental constraints on the modeling of low-energy nuclear recoil
 s in liquid argon and\nare particularly relevant for the interpretation of
  Dark Matter searches in the low-mass WIMP\nregime.\nIn this contribution\
 , an overview of the ReD experiment and its measurement technique will\nbe
  presented\, together with the main results of the published measurement. 
 Finally\, the\nimpact of the improved characterization of the argon respon
 se on the sensitivity of the\nupcoming DarkSide-20k experiment will be dis
 cussed\, highlighting the enhanced discovery\npotential for low-mass Dark 
 Matter candidates.\n\nhttps://indico.particle.mephi.ru/event/626/contribut
 ions/6396/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6396/
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