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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.
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.
Original language | English |
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Number of pages | 11 |
Journal | Astroparticle Physics |
Volume | 116 |
Early online date | 4 Oct 2019 |
DOIs | |
Publication status | Published - 1 Mar 2020 |
Keywords
- physics.ins-det
- hep-ex
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- 1 Finished