Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches

The LUX-ZEPLIN (LZ) Collaboration

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalAstroparticle Physics
Volume96
DOIs
StatePublished - Nov 1 2017

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cryostats
dark matter
titanium
radioactivity
detectors
weakly interacting massive particles
particle interactions
xenon
vessels
proximity
liquids
metals
simulation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

@article{615c929dde5e447abbb8ed5f65b50abe,
title = "Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches",
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.",
author = "{The LUX-ZEPLIN (LZ) Collaboration} and Akerib, {D. S.} and Akerlof, {C. W.} and Akimov, {D. Yu} and Alsum, {S. K.} and Ara{\'u}jo, {H. M.} and Arnquist, {I. J.} and M. Arthurs and X. Bai and Bailey, {A. J.} and J. Balajthy and S. Balashov and Barry, {M. J.} and J. Belle and P. Beltrame and T. Benson and Bernard, {E. P.} and A. Bernstein and Biesiadzinski, {T. P.} and Boast, {K. E.} and A. Bolozdynya and B. Boxer and R. Bramante and P. Br{\'a}s and Buckley, {J. H.} and Bugaev, {V. V.} and R. Bunker and S. Burdin and Busenitz, {J. K.} and C. Carels and Carlsmith, {D. L.} and B. Carlson and Carmona-Benitez, {M. C.} and C. Chan and Cherwinka, {J. J.} and Chiller, {A. A.} and C. Chiller and A. Cottle and {Carmona Benitez}, {Maria Del Carmen} and Craddock, {W. W.} and A. Currie and Dahl, {C. E.} and Davison, {T. J.R.} and A. Dobi and Dobson, {J. E.Y.} and E. Druszkiewicz and Edberg, {T. K.} and Edwards, {W. R.} and Emmet, {W. T.} and Faham, {C. H.} and S. Fiorucci",
year = "2017",
month = "11",
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language = "English (US)",
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}

Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches. / The LUX-ZEPLIN (LZ) Collaboration.

In: Astroparticle Physics, Vol. 96, 01.11.2017, p. 1-10.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches

AU - The LUX-ZEPLIN (LZ) Collaboration

AU - Akerib, D. S.

AU - Akerlof, C. W.

AU - Akimov, D. Yu

AU - Alsum, S. K.

AU - Araújo, H. M.

AU - Arnquist, I. J.

AU - Arthurs, M.

AU - Bai, X.

AU - Bailey, A. J.

AU - Balajthy, J.

AU - Balashov, S.

AU - Barry, M. J.

AU - Belle, J.

AU - Beltrame, P.

AU - Benson, T.

AU - Bernard, E. P.

AU - Bernstein, A.

AU - Biesiadzinski, T. P.

AU - Boast, K. E.

AU - Bolozdynya, A.

AU - Boxer, B.

AU - Bramante, R.

AU - Brás, P.

AU - Buckley, J. H.

AU - Bugaev, V. V.

AU - Bunker, R.

AU - Burdin, S.

AU - Busenitz, J. K.

AU - Carels, C.

AU - Carlsmith, D. L.

AU - Carlson, B.

AU - Carmona-Benitez, M. C.

AU - Chan, C.

AU - Cherwinka, J. J.

AU - Chiller, A. A.

AU - Chiller, C.

AU - Cottle, A.

AU - Carmona Benitez, Maria Del Carmen

AU - Craddock, W. W.

AU - Currie, A.

AU - Dahl, C. E.

AU - Davison, T. J.R.

AU - Dobi, A.

AU - Dobson, J. E.Y.

AU - Druszkiewicz, E.

AU - Edberg, T. K.

AU - Edwards, W. R.

AU - Emmet, W. T.

AU - Faham, C. H.

AU - Fiorucci, S.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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.

AB - 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.

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U2 - 10.1016/j.astropartphys.2017.09.002

DO - 10.1016/j.astropartphys.2017.09.002

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EP - 10

JO - Astroparticle Physics

JF - Astroparticle Physics

SN - 0927-6505

ER -