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Title: Cosmogenic production of 39Ar and 37Ar in argon

Journal Article · · Physical Review C

We have experimentally determined the production rate of 39Ar and 37Ar from cosmic ray neutron interactions in argon at sea level. Understanding these production rates is important for argon-based dark matter experiments that plan to utilize argon extracted from deep underground because it is imperative to know what the ingrowth of 39Ar will be during the production, transport, and storage of the underground argon. These measurements also allow for the prediction of 39Ar and 37Ar concentrations in the atmosphere which can be used to determine the presence of other sources of these isotopes. Through controlled irradiation with a neutron beam that mimics the cosmic ray neutron spectrum, followed by direct counting of 39Ar and 37Ar decays with sensitive ultralow background proportional counters, we determined that the production rate from cosmic ray neutrons at sea level is expected to be (759 ± 128) atoms / (k Ar day) for 39Ar, and (51.0 ± 7.4) atoms / (kgAr day) for 37Ar . We also performed a survey of the alternate production mechanisms based on the state of knowledge of the associated cross sections to obtain a total sea-level cosmic ray production rate of (1048 ± 133) atoms / (kg Ar day) for 39Ar, (56.7 ± 7.5) atoms / (kgAr day) for 37Ar in underground argon, and (92 ± 13) atoms / (kgAr day) for 37Ar in atmospheric argon.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
89233218CNA000001; AC05-76RL01830; AC52-06NA25396; LANLE9BW
OSTI ID:
1770107
Alternate ID(s):
OSTI ID: 1556831
Report Number(s):
LA-UR-19-21579; TRN: US2206793
Journal Information:
Physical Review C, Vol. 100, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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