期刊
PHYSICS OF THE DARK UNIVERSE
卷 9-10, 期 -, 页码 1-7出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.dark.2015.06.001
关键词
Dark matter; Time projection chamber; DRIFT
资金
- STFC [ST/K001 337/1, ST/F007337/1]
- NSF [1103420, 1103511]
- Sloan Foundation
- Research Corporation for Science Advancement
- STFC [ST/F007337/1, ST/I006242/1, ST/K001337/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K001337/1, ST/I006242/1, ST/K001337/1 DMUK, ST/F007337/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1103420, 1506116] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1407773, 1407747, 1103511, 1103455] Funding Source: National Science Foundation
The addition of O-2 to gas mixtures in time projection chambers containing CS2 has recently been shown to produce multiple negative ions that travel at slightly different velocities. This allows a measurement of the absolute position of ionising events in the z (drift) direction. In this work, we apply the z-fiducialisation technique to a directional dark matter search. We present results from a 46.3 live-day source-free exposure of the DRIFT-IId detector run in this new mode. With full-volume fiducialisation, we have achieved the first background-free operation of a directional detector. The resulting exclusion curve for spin-dependent WIMP-proton interactions reaches 1.1 pb at 100 GeV/c(2), a factor of 2 better than our previous work. We describe the automated analysis used here, and argue that detector upgrades, implemented after the acquisition of these data, will bring an additional factor of greater than or similar to 3 improvement in the near future. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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