Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches
arXiv:1102.2865 · doi:10.1016/j.nima.2011.01.089
Abstract
Electron diffusion in a liquid xenon time projection chamber has recently been used to infer the 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.
same as v1 but removed \linenumbers call which detracted from readability
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- A Review of NEST Models for Liquid Xenon and Exhaustive Comparison to Other Approaches
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- A Model for the Secondary Scintillation Pulse Shape from a Gas Proportional Scintillation Counter
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