Journal
ASTROPARTICLE PHYSICS
Volume 96, Issue -, Pages 1-10Publisher
ELSEVIER
DOI: 10.1016/j.astropartphys.2017.09.002
Keywords
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Funding
- U.S. Department of Energy (DOE) [DESC0012704, DESC0010010, DE-ACO2-05CH11231, DE-SC0012161, DE-SC0014223, DE-FG02- 13ER42020, DE-FG02-91 ER40674, DE-NA0000979, DESC0011702, DESC0006572, DESC0012034, DE-SC0006605, DEFG02-10ER46709]
- U.S. National Science Foundation (NSF) [NSF PHY-110447, NSF PHY-1506068, NSF PHY-1312561, NSF PHY-1406943, NSF PHY-1642619]
- U.K. Science and Technology Facilities Council [ST/K006428/1, ST/M003655/1, ST/M003981/1, ST/M003744/1, ST/M003639/1, ST/M003604/1, ST/M003469/1]
- Portuguese Foundation for Science and Technology (FCT) [CERN/FP/123610/2011, PTDC/FISNUC/1525/2014]
- University College London and Lawrence Berkeley National Laboratory under the International Exchange Scheme [1E141517]
- Boulby Underground Laboratory in the U.K., the University of Wisconsin [UW PRJ82AJ]
- South Dakota Science and Technology
- GridPP Collaboration
- U.S. Department of Energy [DE-AC05-76RL01830]
- DOE, Office of High Energy Physics
- State of South Dakota
- Science and Technology Facilities Council [ST/P00377X/1, ST/M003604/1, ST/K001337/1, ST/M003981/1, ST/N000447/1, ST/M003655/1, ST/K006436/1, ST/K006428/1 DMUK, ST/M003639/1, ST/L006545/1, ST/H000917/2, Lux Zeplin, ST/K001337/1 ATLAS Upgrades, ST/L003090/1, PP/E000371/1, ST/M002667/1, ST/K006517/1 DMUK, ST/M003655/1 Lux Zepplin, ST/N000277/1, ST/M003981/1 Lux Zepplin, ST/K001337/1 DMUK, ST/K001337/1 T2K, ST/K00302X/1, ST/N000242/1, ST/K006444/1 DMUK, ST/P003788/1, ST/K001337/1 MICE, ST/M00144X/1, ST/K001337/1 MICE/UKNF, ST/H000917/1, ST/K006444/1, ST/M003469/1, ST/K001337/1 ATLAS, ST/K000799/1, ST/K006436/1 DMUK, ST/K006770/1 DMUK, ST/K006428/1, ST/M003744/1, ST/M003744/1 Lux Zepplin, ST/K001337/1 SNO+] Funding Source: researchfish
- Fundação para a Ciência e a Tecnologia [CERN/FP/123610/2011] Funding Source: FCT
- STFC [ST/M003604/1, ST/M003981/1, ST/K006444/1, ST/M002667/1, ST/L003090/1, ST/P00377X/1, ST/M00144X/1, ST/M003469/1, ST/M003655/1, PP/E000371/1, ST/M003744/1, ST/K000799/1, ST/H000917/2, ST/R000042/1, ST/K00302X/1, ST/N000277/1, ST/P003788/1, ST/N000242/1, Lux Zeplin, ST/N000447/1, ST/K006428/1, ST/L006545/1, ST/K006436/1, ST/H000917/1, ST/K001337/1, ST/M003639/1] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-SC0012161, DE-SC0014223] Funding Source: U.S. Department of Energy (DOE)
Ask authors/readers for more resources
The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a detector containing a total of 10 tonnes of liquid xenon within a double -vessel cryostat. The large mass and proximity of the cryostat to the active detector volume demand the use of material with extremely low intrinsic radioactivity. We report on the radioassay campaign conducted to identify suitable metals, the determination of factors limiting radiopure production, and the selection of titanium for construction of the LZ cryostat and other detector components. This titanium has been measured with activities of U-238(e) < 1.6 mBq/kg, U-238(I) < 0.09 mBq/kg, Th-232(e) = 0.28 +/- 0.03 mBq/kg, Th-232(I) = 0.25 +/- 0.02 mBq/kg, K-40 <0.54 mBq/kg, and (60) Co <0.02 mBq/kg (68% CL). Such low intrinsic activities, which are some of the lowest ever reported for titanium, enable its use for future dark matter and other rare event searches. Monte Carlo simulations have been performed to assess the expected background contribution from the LZ cryostat with this radioactivity. In 1,000 days of WIMP search exposure of a 5.6-tonne fiducial mass, the cryostat will contribute only a mean background of 0.160 +/- 0.001(stat) +/- 0.030(sys) counts. (C) 2017 Elsevier B.V. All rights reserved.
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