Akerib, DS;
Akerlof, CW;
Akimov, DY;
Alsum, SK;
Araújo, HM;
Arnquist, IJ;
Arthurs, M;
... Zhang, C; + view all
(2017)
Identification of Radiopure Titanium for the LZ Dark Matter Experiment and Future Rare Event Searches.
Astroparticle Physics
, 96
pp. 1-10.
10.1016/j.astropartphys.2017.09.002.
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Abstract
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 238Ue <1.6 mBq/kg, 238Ul <0.09 mBq/kg, 232The = 0.28±0.03 mBq/kg, 232Thl = 0.25 ± 0.02 mBq/kg, 40K <0.54 mBq/kg, and 60Co <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.
| Type: | Article |
|---|---|
| Title: | Identification of Radiopure Titanium for the LZ Dark Matter Experiment and Future Rare Event Searches |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.astropartphys.2017.09.002 |
| Publisher version: | http://doi.org/10.1016/j.astropartphys.2017.09.002 |
| Language: | English |
| Additional information: | © 2017 Elsevier B.V. All rights reserved. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1552516 |
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