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Measurement of the Gamma Ray Background in the Davis Cavern at the Sanford Underground Research Facility

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Original languageEnglish
Number of pages11
JournalAstroparticle Physics
Volume116
Early online date4 Oct 2019
DOIs
Publication statusPublished - 1 Mar 2020

Abstract

Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are aaffected by backgrounds from -rays emitted by 40K and the 238U and 232Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4,850-foot level. In order to characterise the cavern background, in-situ -ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0{3300 keV) varied from 596 Hz to 1355 Hz for unshielded measurements, corresponding to a total ux in the cavern of 1:9 0:4
cm􀀀2s􀀀1. The resulting activity in the walls of the cavern
can be characterised as 220 60 Bq/kg of 40K, 29 15 Bq/kg of 238U, and 13 3 Bq/kg of 232Th.

    Research areas

  • physics.ins-det, hep-ex

ID: 114408177