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Title: Evaluation of cosmogenic production of  39Ar and  42Ar for rare-event physics using underground argon

Journal Article · · Astroparticle Physics
 [1];  [2]
  1. Mount Marty University, Yankton, SD (United States)
  2. University of South Dakota, Vermillion, SD (United States)

Underground argon (UAr) with lower cosmogenic activities of 39Ar and 42Ar has been planned as a detector in detecting scintillation light and charge collection using time projection chambers for dark matter searches and as a veto detector in suppressing backgrounds for neutrinoless double beta decay (0$vββ$ ) experiments. Long-lived radioactive isotopes, 39Ar and 42Ar, can also be produced on the surface when UAr is pumped out from a deep well. Understanding the production of long-lived isotopes in Ar is important for utilizing UAr for dark matter and 0$vββ$ experiments in terms of its production, transportation, and storage. Ar exposure to cosmic rays at sea-level is simulated using Geant4 for a given cosmic ray muon, neutron, and proton energy spectrum. Here we report the simulated cosmogenic production rates of 39Ar, 42Ar, and other long-lived isotopes at sea-level from fast neutrons, high energy muons, and high energy protons. Total production rates of 938.53/kgAr day and 5.81 × 10-3/kgAr day for 39Ar and 42Ar are found from our simulation. Utilizing these production rates, we set a time limit of 954 days constrained by the production of 39Ar for UAr to be on the surface before it compromises the sensitivity for a dark matter experiment. Similarly, a time limit of 1702 days constrained by the production of 42Ar is found for a 0$vββ$ experiment.

Research Organization:
Univ. of South Dakota, Vermillion, SD (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); University of South Dakota; State of South Dakota
Grant/Contract Number:
FG02-10ER46709; SC0004768
OSTI ID:
1976881
Alternate ID(s):
OSTI ID: 1870334
Journal Information:
Astroparticle Physics, Vol. 142, Issue C; ISSN 0927-6505
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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