Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2011. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- PDF-file: 6 pages; size: 0.9 Mbytes
- Additional Creators:
- Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Electron diffusion in a liquid xenon time projection chamber has recently been used to infer the z coordinate of a particle interaction, from the width of the electron signal. The goal of this technique is to reduce the background event rate by discriminating edge events from bulk events. Analyses of dark matter search data which employ it would benefit from increased longitudinal electron diffusion. We show that a significant increase is expected if the applied electric field is decreased. This observation is trivial to implement but runs contrary to conventional wisdom and practice. We also extract a first measurement of the longitudinal diffusion coefficient, and confirm the expectation that electron diffusion in liquid xenon is highly anisotropic under typical operating conditions.
- Published through SciTech Connect., 02/14/2011., "llnl-jrnl-471078", Nuclear Instruments and Methods in Physics Research, vol. 635, n/a, February 3, 2011, pp. 41 635 ISSN 0167-5087; NIMRD9 FT, and Sorensen, P.
- Funding Information:
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