サンフォード地下研究施設での暗黒物質検出器LUX-ZEPLINの起動に成功した。(Berkeley Lab Researchers Record Successful Startup of LUX-ZEPLIN Dark Matter Detector at Sanford Underground Research Facility)

2022-07-082022-09-24

2022-07-07 ローレンスバークレー国立研究所(LBNL)

サウスダコタ州のブラックヒルズの地下にあるサンフォード地下研究施設（SURF）では、ローレンス・バークレー国立研究所（バークレー研）が主導する革新的でユニークな感度の暗黒物質検出器、LUX-ZEPLIN（LZ）実験がスタートアップ運転のチェックアウト段階を経て、最初の結果を得ました。
LUX-ZEPLIN（LZ）実験は、サンフォード地下研究施設で稼働している二相キセノン時間投影装置を中心とした暗黒物質検出器である。二相キセノン時間投影装置を中心とした暗黒物質検出器で、米国サウスダコタ州リードのサンフォード地下研究施設で稼動している。この論文では、LZが初めて行った弱相互作用質量粒子（WIMP）の探索の結果を報告している。

(Left) A schematic of the LZ detector. (Right) Illustration of LZ operation – particles interact in liquid xenon, releasing a flash of light and charge that are collected by photomultiplier tube arrays at top and bottom. (Credit: Left schematic: LZ collaboration. Right image: LZ/SLAC)The LZ central detector in the clean room at Sanford Underground Research Facility after assembly, before beginning its journey underground. (Credit: Matthew Kapust, Sanford Underground Research Facility)

＜関連情報＞

LUX-ZEPLIN (LZ) 暗黒物質実験のWIMP感度の予測。
Projected WIMP sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment

D.S. Akerib, C.W. Akerlof, S.K. Alsum, H.M. Araújo, M. Arthurs, X. Bai, A.J. Bailey, J. Balajthy, S. Balashov, D. Bauer, J. Belle, P. Beltrame, T. Benson, E.P. Bernard, T.P. Biesiadzinski, K.E. Boast, B. Boxer, P. Brás, J.H. Buckley, V.V. Bugaev, S. Burdin, J.K. Busenitz, C. Carels, D.L. Carlsmith, B. Carlson, M.C. Carmona-Benitez, C. Chan, J.J. Cherwinka, A. Cole, A. Cottle, W.W. Craddock, A. Currie, J.E. Cutter, C.E. Dahl, L. de Viveiros, A. Dobi, J.E.Y. Dobson, E. Druszkiewicz, T.K. Edberg, W.R. Edwards, A. Fan, S. Fayer, S. Fiorucci, T. Fruth, R.J. Gaitskell, J. Genovesi, C. Ghag, M.G.D. Gilchriese, M.G.D.van der Grinten, C.R. Hall, S. Hans, K. Hanzel, S.J. Haselschwardt, S.A. Hertel, S. Hillbrand, C. Hjemfelt, M.D. Hoff, J.Y-K. Hor, D.Q. Huang, C.M. Ignarra, W. Ji, A.C. Kaboth, K. Kamdin, J. Keefner, D. Khaitan, A. Khazov, Y.D. Kim, C.D. Kocher, E.V. Korolkova, H. Kraus, H.J. Krebs, L. Kreczko, B. Krikler, V.A. Kudryavtsev, S. Kyre, J. Lee, B.G. Lenardo, D.S. Leonard, K.T. Lesko, C. Levy, J. Li, J. Liao, F.-T. Liao, J. Lin, A. Lindote, R. Linehan, W.H. Lippincott, X. Liu, M.I. Lopes, B. López Paredes, W. Lorenzon, S. Luitz, J.M. Lyle, P. Majewski, A. Manalaysay, R.L. Mannino, C. Maupin, D.N. McKinsey, Y. Meng, E.H. Miller et al. (78 additional authors not shown)

Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics – Experiment (hep-ex); Instrumentation and Detectors (physics.ins-det)
Cite as: arXiv:1802.06039 [astro-ph.IM]
(or arXiv:1802.06039v2 [astro-ph.IM] for this version)

https://doi.org/10.48550/arXiv.1802.06039
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Journal reference: Phys. Rev. D 101, 052002 (2020)
Related DOI:
https://doi.org/10.1103/PhysRevD.101.052002
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LUX-ZEPLIN (LZ) is a next generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using a two-phase xenon detector with an active mass of 7~tonnes, LZ will search primarily for low-energy interactions with Weakly Interacting Massive Particles (WIMPs), which are hypothesized to make up the dark matter in our galactic halo. In this paper, the projected WIMP sensitivity of LZ is presented based on the latest background estimates and simulations of the detector. For a 1000~live day run using a 5.6~tonne fiducial mass, LZ is projected to exclude at 90\% confidence level spin-independent WIMP-nucleon cross sections above 1.4×10−48~cm2 for a 40~GeV/c2 mass WIMP. Additionally, a 5σ discovery potential is projected reaching cross sections below the exclusion limits of recent experiments. For spin-dependent WIMP-neutron(-proton) scattering, a sensitivity of 2.3×10−43~cm2 (7.1×10−42~cm2) for a 40~GeV/c2 mass WIMP is expected. With underground installation well underway, LZ is on track for commissioning at SURF in 2020.