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SUMMARY:Gd-PMMA: a novel neutron tagging technology for low background det
 ectors
DTSTART;VALUE=DATE-TIME:20230907T094000Z
DTEND;VALUE=DATE-TIME:20230907T100000Z
DTSTAMP;VALUE=DATE-TIME:20260615T103636Z
UID:indico-contribution-2787@indico.tlabs.ac.za
DESCRIPTION:Speakers: Yi Wang (IHEP\, CAS)\nLow background detectors\, suc
 h as those used in direct dark matter searches\, require high-efficient ne
 utron veto to reject nuclear recoil backgrounds. Gadolinium-doped polymeth
 yl methacrylate (Gd-PMMA) has emerged as a promising solid neutron tagging
  material\, with high hydrogen content for moderating neutrons and gadolin
 ium content for capturing thermal neutrons and exploiting subsequent emiss
 ion of high-energy gamma rays. This talk introduces a novel Gd-PMMA materi
 al based on a complex compound called gadolinium methacrylate\, which will
  be used in the DarkSide-20k experiment\, a direct dark matter search expe
 riment with liquid argon. \nThe Gd-PMMA will serve as both a neutron taggi
 ng material and the main structural material of the dual-phase argon Time 
 Projection Chamber (TPC) in the DarkSide-20k detector. This design allows 
 for the Gd-PMMA to be located as close as possible to the detector's activ
 e volume to tag any possible neutrons from intrinsic backgrounds. With liq
 uid argon buffers on both sides of the Gd-PMMA\, gamma rays released durin
 g neutron capture can be effectively detected. To maximize neutron veto ef
 ficiency\, a ~1% gadolinium mass fraction with 15 cm thick Gd-PMMA surroun
 ding the TPC's active volume is required. Radiopurity control of this mate
 rial is also being studied to ensure its suitability for use in low-backgr
 ound experiments.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/27
 87/
LOCATION: Meeting Room 2.44 - 2.46
URL:https://indico.tlabs.ac.za/event/112/contributions/2787/
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