Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electroluminescence pulse shape and electron diffusion in liquid argon
  measured in a dual-phase TPC   We report the measurement of the longitudinal diffusion constant in liquid
argon with the DarkSide-50 dual-phase time projection chamber. The measurement
is performed at drift electric fields of 100 V/cm, 150 V/cm, and 200 V/cm using
high statistics $^{39}$Ar decays from atmospheric argon. We derive an
expression to describe the pulse shape of the electroluminescence signal (S2)
in dual-phase TPCs. The derived S2 pulse shape is fit to events from the
uppermost portion of the TPC in order to characterize the radial dependence of
the signal. The results are provided as inputs to the measurement of the
longitudinal diffusion constant DL, which we find to be (4.12 $\pm$ 0.04)
cm$^2$/s for a selection of 140keV electron recoil events in 200V/cm drift
field and 2.8kV/cm extraction field. To study the systematics of our
measurement we examine datasets of varying event energy, field strength, and
detector volume yielding a weighted average value for the diffusion constant of
(4.09 $\pm$ 0.09) cm$^2$ /s. The measured longitudinal diffusion constant is
observed to have an energy dependence, and within the studied energy range the
result is systematically lower than other results in the literature.

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The categories of this paper are: econ
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex