Cosmogenic production of <SUP>37</SUP>Ar in the context of the LUX-ZEPLIN experiment

Aalbers, J, Akerib, DS, Al Musalhi, AK, Alder, F, Alsum, SK, Amarasinghe, CS, Ames, A, Anderson, TJ, Angelides, N, Araujo, HM
et al (show 197 more authors) (2022) Cosmogenic production of <SUP>37</SUP>Ar in the context of the LUX-ZEPLIN experiment. PHYSICAL REVIEW D, 105 (8). 082004-.

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We estimate the amount of Ar37 produced in natural xenon via cosmic-ray-induced spallation, an inevitable consequence of the transportation and storage of xenon on the Earth's surface. We then calculate the resulting Ar37 concentration in a 10-tonne payload (similar to that of the LUX-ZEPLIN experiment) assuming a representative schedule of xenon purification, storage, and delivery to the underground facility. Using the spallation model by Silberberg and Tsao, the sea-level production rate of Ar37 in natural xenon is estimated to be 0.024 atoms/kg/day. Assuming the xenon is successively purified to remove radioactive contaminants in 1-tonne batches at a rate of 1 tonne/month, the average Ar37 activity after 10 tons are purified and transported underground is 0.058-0.090 μBq/kg, depending on the degree of argon removal during above-ground purification. Such cosmogenic Ar37 will appear as a noticeable background in the early science data, while decaying with a 35-day half-life. This newly noticed production mechanism of Ar37 should be considered when planning for future liquid-xenon-based experiments.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Sep 2022 15:12
Last Modified: 21 Jun 2024 18:13
DOI: 10.1103/PhysRevD.105.082004
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