Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The XENON100 Detector   XENON100 is a liquid xenon (LXe) time projection chamber built to search for
rare collisions of hypothetical, weakly interacting massive particles (WIMPs).
Operated in a low-background shield at the Gran Sasso underground laboratory in
Italy, XENON100 has reached the unprecedented background level of $<$0.15
events/day/\kevr in the energy range below 100 \kevr in 30 kg of target mass,
before electronic/nuclear recoil discrimination. It found no evidence for WIMPs
during a dark matter run lasting for 100.9 live days in 2010, excluding with
90% confidence scalar WIMP-nucleon cross sections above 7x10$^{-45}$ cm$^{2}$
at a WIMP mass of 50 GeV/c$^{2}$. A new run started in March 2011, and more
than 200 live days of WIMP-search data have been acquired. Results of this
second run are expected to be released in summer 2012.

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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys