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SUMMARY:The cosmic muon-induced background for the LEGEND-1000 Alternative
  Site at LNGS
DTSTART;VALUE=DATE-TIME:20210901T171500Z
DTEND;VALUE=DATE-TIME:20210901T173000Z
DTSTAMP;VALUE=DATE-TIME:20260421T042508Z
UID:indico-contribution-15508@indico.ific.uv.es
DESCRIPTION:Speakers: Moritz Neuberger (TUM (Techincal University Munich))
 \nThe in-situ production of long-lived isotopes by cosmic muon interaction
 s may generate a non-negligible background for the search for rare events 
 in the deep subsurface\, defining a minimum depth requirement. Monte Carlo
  studies for a GERDA-like experiment at LNGS-depth identified the delayed 
 decay of $^{77(\\mathrm{m})}$Ge as the dominant in-situ cosmogenic backgro
 und in the search for the neutrinoless double-beta decay of $^{76}$Ge [1\,
 2]\, with a projected background index (BI) of $2.7\\times 10^{-6}$ cts/(k
 eV$\\cdot$kg$\\cdot$yr)  after delayed coincidence rejection at Q$_{\\beta
 \\beta}=2039~\\mathrm{MeV}$ [2]. The future tone-scale LEGEND-1000 experim
 ent requires a total BI from all individual contributions of $\\leq10^{-5}
 $ cts/(keV$\\cdot$kg$\\cdot$yr) [3\,4]. Dedicated Monte Carlo simulation s
 tudies of the $^{77(\\mathrm{m})}$Ge background for LEGEND-1000\, includin
 g different mitigation strategies\, were performed at the alternative LNGS
  site\, as opposed to the SNOLAB baseline site. We will present the effect
 s of passive and active measures to further reduce this background contrib
 ution to meet the overall background requirements.\n\n[1] L. Pandola et al
 .\, Nucl. Instr. Methods A 570 (2007) 149\n[2] C. Wiesinger et al.\, Eur. 
 Phys. J. C (2018) 78:597\n[3] AIP Conference Proceedings\, Volume 1894\, I
 ssue 1\, id.020027\n[4] LEGEND-1000 pCDR. To be available at https://legen
 d-exp.org/science/publications\n\nhttps://indico.ific.uv.es/event/6178/con
 tributions/15508/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15508/
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